linux.git, branch v5.15.38 Clone of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git Linux 5.15.38 2022-05-09T07:14:44+00:00 Greg Kroah-Hartman gregkh@linuxfoundation.org 2022-05-09T07:14:44+00:00 3fbf24b73f4a5bc8fd39a6b7a29145451c1039ce Link: https://lore.kernel.org/r/20220504153053.873100034@linuxfoundation.org Tested-by: Ron Economos <re@w6rz.net> Tested-by: Linux Kernel Functional Testing <lkft@linaro.org> Tested-by: Guenter Roeck <linux@roeck-us.net> Tested-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Link: https://lore.kernel.org/r/20220504153053.873100034@linuxfoundation.org
Tested-by: Ron Economos <re@w6rz.net>
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
powerpc/64: Add UADDR64 relocation support 2022-05-09T07:14:44+00:00 Alexey Kardashevskiy aik@ozlabs.ru 2022-03-09T06:18:22+00:00 151322c24e8781a75cd9ec14049ef91a084da0b0 commit d799769188529abc6cbf035a10087a51f7832b6b upstream. When ld detects unaligned relocations, it emits R_PPC64_UADDR64 relocations instead of R_PPC64_RELATIVE. Currently R_PPC64_UADDR64 are detected by arch/powerpc/tools/relocs_check.sh and expected not to work. Below is a simple chunk to trigger this behaviour (this disables optimization for the demonstration purposes only, this also happens with -O1/-O2 when CONFIG_PRINTK_INDEX=y, for example): \#pragma GCC push_options \#pragma GCC optimize ("O0") struct entry { const char *file; int line; } __attribute__((packed)); static const struct entry e1 = { .file = __FILE__, .line = __LINE__ }; static const struct entry e2 = { .file = __FILE__, .line = __LINE__ }; ... prom_printf("e1=%s %lx %lx\n", e1.file, (unsigned long) e1.file, mfmsr()); prom_printf("e2=%s %lx\n", e2.file, (unsigned long) e2.file); \#pragma GCC pop_options This adds support for UADDR64 for 64bit. This reuses __dynamic_symtab from the 32bit code which supports more relocation types already. Because RELACOUNT includes only R_PPC64_RELATIVE, this replaces it with RELASZ which is the size of all relocation records. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Cc: Nathan Chancellor <nathan@kernel.org> Link: https://lore.kernel.org/r/20220309061822.168173-1-aik@ozlabs.ru Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit d799769188529abc6cbf035a10087a51f7832b6b upstream.

When ld detects unaligned relocations, it emits R_PPC64_UADDR64
relocations instead of R_PPC64_RELATIVE. Currently R_PPC64_UADDR64 are
detected by arch/powerpc/tools/relocs_check.sh and expected not to work.
Below is a simple chunk to trigger this behaviour (this disables
optimization for the demonstration purposes only, this also happens with
-O1/-O2 when CONFIG_PRINTK_INDEX=y, for example):

  \#pragma GCC push_options
  \#pragma GCC optimize ("O0")
  struct entry {
          const char *file;
          int line;
  } __attribute__((packed));
  static const struct entry e1 = { .file = __FILE__, .line = __LINE__ };
  static const struct entry e2 = { .file = __FILE__, .line = __LINE__ };
  ...
  prom_printf("e1=%s %lx %lx\n", e1.file, (unsigned long) e1.file, mfmsr());
  prom_printf("e2=%s %lx\n", e2.file, (unsigned long) e2.file);
  \#pragma GCC pop_options

This adds support for UADDR64 for 64bit. This reuses __dynamic_symtab
from the 32bit code which supports more relocation types already.

Because RELACOUNT includes only R_PPC64_RELATIVE, this replaces it with
RELASZ which is the size of all relocation records.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20220309061822.168173-1-aik@ozlabs.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
objtool: Fix type of reloc::addend 2022-05-09T07:14:44+00:00 Peter Zijlstra peterz@infradead.org 2022-04-17T15:03:40+00:00 ec1bb681eee2f179fc7166a620766a48b0aa8c23 commit c087c6e7b551b7f208c0b852304f044954cf2bb3 upstream. Elf{32,64}_Rela::r_addend is of type: Elf{32,64}_Sword, that means that our reloc::addend needs to be long or face tuncation issues when we do elf_rebuild_reloc_section(): - 107: 48 b8 00 00 00 00 00 00 00 00 movabs $0x0,%rax 109: R_X86_64_64 level4_kernel_pgt+0x80000067 + 107: 48 b8 00 00 00 00 00 00 00 00 movabs $0x0,%rax 109: R_X86_64_64 level4_kernel_pgt-0x7fffff99 Fixes: 627fce14809b ("objtool: Add ORC unwind table generation") Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lkml.kernel.org/r/20220419203807.596871927@infradead.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit c087c6e7b551b7f208c0b852304f044954cf2bb3 upstream.

Elf{32,64}_Rela::r_addend is of type: Elf{32,64}_Sword, that means
that our reloc::addend needs to be long or face tuncation issues when
we do elf_rebuild_reloc_section():

  - 107:  48 b8 00 00 00 00 00 00 00 00   movabs $0x0,%rax        109: R_X86_64_64        level4_kernel_pgt+0x80000067
  + 107:  48 b8 00 00 00 00 00 00 00 00   movabs $0x0,%rax        109: R_X86_64_64        level4_kernel_pgt-0x7fffff99

Fixes: 627fce14809b ("objtool: Add ORC unwind table generation")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20220419203807.596871927@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
objtool: Fix code relocs vs weak symbols 2022-05-09T07:14:44+00:00 Peter Zijlstra peterz@infradead.org 2022-04-17T15:03:36+00:00 19ffee7d62311111dabbb89d946ca22b1b867807 commit 4abff6d48dbcea8200c7ea35ba70c242d128ebf3 upstream. Occasionally objtool driven code patching (think .static_call_sites .retpoline_sites etc..) goes sideways and it tries to patch an instruction that doesn't match. Much head-scatching and cursing later the problem is as outlined below and affects every section that objtool generates for us, very much including the ORC data. The below uses .static_call_sites because it's convenient for demonstration purposes, but as mentioned the ORC sections, .retpoline_sites and __mount_loc are all similarly affected. Consider: foo-weak.c: extern void __SCT__foo(void); __attribute__((weak)) void foo(void) { return __SCT__foo(); } foo.c: extern void __SCT__foo(void); extern void my_foo(void); void foo(void) { my_foo(); return __SCT__foo(); } These generate the obvious code (gcc -O2 -fcf-protection=none -fno-asynchronous-unwind-tables -c foo*.c): foo-weak.o: 0000000000000000 <foo>: 0: e9 00 00 00 00 jmpq 5 <foo+0x5> 1: R_X86_64_PLT32 __SCT__foo-0x4 foo.o: 0000000000000000 <foo>: 0: 48 83 ec 08 sub $0x8,%rsp 4: e8 00 00 00 00 callq 9 <foo+0x9> 5: R_X86_64_PLT32 my_foo-0x4 9: 48 83 c4 08 add $0x8,%rsp d: e9 00 00 00 00 jmpq 12 <foo+0x12> e: R_X86_64_PLT32 __SCT__foo-0x4 Now, when we link these two files together, you get something like (ld -r -o foos.o foo-weak.o foo.o): foos.o: 0000000000000000 <foo-0x10>: 0: e9 00 00 00 00 jmpq 5 <foo-0xb> 1: R_X86_64_PLT32 __SCT__foo-0x4 5: 66 2e 0f 1f 84 00 00 00 00 00 nopw %cs:0x0(%rax,%rax,1) f: 90 nop 0000000000000010 <foo>: 10: 48 83 ec 08 sub $0x8,%rsp 14: e8 00 00 00 00 callq 19 <foo+0x9> 15: R_X86_64_PLT32 my_foo-0x4 19: 48 83 c4 08 add $0x8,%rsp 1d: e9 00 00 00 00 jmpq 22 <foo+0x12> 1e: R_X86_64_PLT32 __SCT__foo-0x4 Noting that ld preserves the weak function text, but strips the symbol off of it (hence objdump doing that funny negative offset thing). This does lead to 'interesting' unused code issues with objtool when ran on linked objects, but that seems to be working (fingers crossed). So far so good.. Now lets consider the objtool static_call output section (readelf output, old binutils): foo-weak.o: Relocation section '.rela.static_call_sites' at offset 0x2c8 contains 1 entry: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000000200000002 R_X86_64_PC32 0000000000000000 .text + 0 0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1 foo.o: Relocation section '.rela.static_call_sites' at offset 0x310 contains 2 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000000200000002 R_X86_64_PC32 0000000000000000 .text + d 0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1 foos.o: Relocation section '.rela.static_call_sites' at offset 0x430 contains 4 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000000100000002 R_X86_64_PC32 0000000000000000 .text + 0 0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1 0000000000000008 0000000100000002 R_X86_64_PC32 0000000000000000 .text + 1d 000000000000000c 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1 So we have two patch sites, one in the dead code of the weak foo and one in the real foo. All is well. *HOWEVER*, when the toolchain strips unused section symbols it generates things like this (using new enough binutils): foo-weak.o: Relocation section '.rela.static_call_sites' at offset 0x2c8 contains 1 entry: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000000200000002 R_X86_64_PC32 0000000000000000 foo + 0 0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1 foo.o: Relocation section '.rela.static_call_sites' at offset 0x310 contains 2 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000000200000002 R_X86_64_PC32 0000000000000000 foo + d 0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1 foos.o: Relocation section '.rela.static_call_sites' at offset 0x430 contains 4 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000000100000002 R_X86_64_PC32 0000000000000000 foo + 0 0000000000000004 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1 0000000000000008 0000000100000002 R_X86_64_PC32 0000000000000000 foo + d 000000000000000c 0000000d00000002 R_X86_64_PC32 0000000000000000 __SCT__foo + 1 And now we can see how that foos.o .static_call_sites goes side-ways, we now have _two_ patch sites in foo. One for the weak symbol at foo+0 (which is no longer a static_call site!) and one at foo+d which is in fact the right location. This seems to happen when objtool cannot find a section symbol, in which case it falls back to any other symbol to key off of, however in this case that goes terribly wrong! As such, teach objtool to create a section symbol when there isn't one. Fixes: 44f6a7c0755d ("objtool: Fix seg fault with Clang non-section symbols") Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lkml.kernel.org/r/20220419203807.655552918@infradead.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 4abff6d48dbcea8200c7ea35ba70c242d128ebf3 upstream.

Occasionally objtool driven code patching (think .static_call_sites
.retpoline_sites etc..) goes sideways and it tries to patch an
instruction that doesn't match.

Much head-scatching and cursing later the problem is as outlined below
and affects every section that objtool generates for us, very much
including the ORC data. The below uses .static_call_sites because it's
convenient for demonstration purposes, but as mentioned the ORC
sections, .retpoline_sites and __mount_loc are all similarly affected.

Consider:

foo-weak.c:

  extern void __SCT__foo(void);

  __attribute__((weak)) void foo(void)
  {
	  return __SCT__foo();
  }

foo.c:

  extern void __SCT__foo(void);
  extern void my_foo(void);

  void foo(void)
  {
	  my_foo();
	  return __SCT__foo();
  }

These generate the obvious code
(gcc -O2 -fcf-protection=none -fno-asynchronous-unwind-tables -c foo*.c):

foo-weak.o:
0000000000000000 <foo>:
   0:   e9 00 00 00 00          jmpq   5 <foo+0x5>      1: R_X86_64_PLT32       __SCT__foo-0x4

foo.o:
0000000000000000 <foo>:
   0:   48 83 ec 08             sub    $0x8,%rsp
   4:   e8 00 00 00 00          callq  9 <foo+0x9>      5: R_X86_64_PLT32       my_foo-0x4
   9:   48 83 c4 08             add    $0x8,%rsp
   d:   e9 00 00 00 00          jmpq   12 <foo+0x12>    e: R_X86_64_PLT32       __SCT__foo-0x4

Now, when we link these two files together, you get something like
(ld -r -o foos.o foo-weak.o foo.o):

foos.o:
0000000000000000 <foo-0x10>:
   0:   e9 00 00 00 00          jmpq   5 <foo-0xb>      1: R_X86_64_PLT32       __SCT__foo-0x4
   5:   66 2e 0f 1f 84 00 00 00 00 00   nopw   %cs:0x0(%rax,%rax,1)
   f:   90                      nop

0000000000000010 <foo>:
  10:   48 83 ec 08             sub    $0x8,%rsp
  14:   e8 00 00 00 00          callq  19 <foo+0x9>     15: R_X86_64_PLT32      my_foo-0x4
  19:   48 83 c4 08             add    $0x8,%rsp
  1d:   e9 00 00 00 00          jmpq   22 <foo+0x12>    1e: R_X86_64_PLT32      __SCT__foo-0x4

Noting that ld preserves the weak function text, but strips the symbol
off of it (hence objdump doing that funny negative offset thing). This
does lead to 'interesting' unused code issues with objtool when ran on
linked objects, but that seems to be working (fingers crossed).

So far so good.. Now lets consider the objtool static_call output
section (readelf output, old binutils):

foo-weak.o:

Relocation section '.rela.static_call_sites' at offset 0x2c8 contains 1 entry:
    Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
0000000000000000  0000000200000002 R_X86_64_PC32          0000000000000000 .text + 0
0000000000000004  0000000d00000002 R_X86_64_PC32          0000000000000000 __SCT__foo + 1

foo.o:

Relocation section '.rela.static_call_sites' at offset 0x310 contains 2 entries:
    Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
0000000000000000  0000000200000002 R_X86_64_PC32          0000000000000000 .text + d
0000000000000004  0000000d00000002 R_X86_64_PC32          0000000000000000 __SCT__foo + 1

foos.o:

Relocation section '.rela.static_call_sites' at offset 0x430 contains 4 entries:
    Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
0000000000000000  0000000100000002 R_X86_64_PC32          0000000000000000 .text + 0
0000000000000004  0000000d00000002 R_X86_64_PC32          0000000000000000 __SCT__foo + 1
0000000000000008  0000000100000002 R_X86_64_PC32          0000000000000000 .text + 1d
000000000000000c  0000000d00000002 R_X86_64_PC32          0000000000000000 __SCT__foo + 1

So we have two patch sites, one in the dead code of the weak foo and one
in the real foo. All is well.

*HOWEVER*, when the toolchain strips unused section symbols it
generates things like this (using new enough binutils):

foo-weak.o:

Relocation section '.rela.static_call_sites' at offset 0x2c8 contains 1 entry:
    Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
0000000000000000  0000000200000002 R_X86_64_PC32          0000000000000000 foo + 0
0000000000000004  0000000d00000002 R_X86_64_PC32          0000000000000000 __SCT__foo + 1

foo.o:

Relocation section '.rela.static_call_sites' at offset 0x310 contains 2 entries:
    Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
0000000000000000  0000000200000002 R_X86_64_PC32          0000000000000000 foo + d
0000000000000004  0000000d00000002 R_X86_64_PC32          0000000000000000 __SCT__foo + 1

foos.o:

Relocation section '.rela.static_call_sites' at offset 0x430 contains 4 entries:
    Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
0000000000000000  0000000100000002 R_X86_64_PC32          0000000000000000 foo + 0
0000000000000004  0000000d00000002 R_X86_64_PC32          0000000000000000 __SCT__foo + 1
0000000000000008  0000000100000002 R_X86_64_PC32          0000000000000000 foo + d
000000000000000c  0000000d00000002 R_X86_64_PC32          0000000000000000 __SCT__foo + 1

And now we can see how that foos.o .static_call_sites goes side-ways, we
now have _two_ patch sites in foo. One for the weak symbol at foo+0
(which is no longer a static_call site!) and one at foo+d which is in
fact the right location.

This seems to happen when objtool cannot find a section symbol, in which
case it falls back to any other symbol to key off of, however in this
case that goes terribly wrong!

As such, teach objtool to create a section symbol when there isn't
one.

Fixes: 44f6a7c0755d ("objtool: Fix seg fault with Clang non-section symbols")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20220419203807.655552918@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
eeprom: at25: Use DMA safe buffers 2022-05-09T07:14:44+00:00 Christophe Leroy christophe.leroy@csgroup.eu 2022-03-23T10:51:55+00:00 80c71d76e88ab3cdbb76e4a2e65828048f1114a7 commit 5b47b751b760ee1c74a51660fd096aa148a362cd upstream. Reading EEPROM fails with following warning: [ 16.357496] ------------[ cut here ]------------ [ 16.357529] fsl_spi b01004c0.spi: rejecting DMA map of vmalloc memory [ 16.357698] WARNING: CPU: 0 PID: 371 at include/linux/dma-mapping.h:326 fsl_spi_cpm_bufs+0x2a0/0x2d8 [ 16.357775] CPU: 0 PID: 371 Comm: od Not tainted 5.16.11-s3k-dev-01743-g19beecbfe9d6-dirty #109 [ 16.357806] NIP: c03fbc9c LR: c03fbc9c CTR: 00000000 [ 16.357825] REGS: e68d9b20 TRAP: 0700 Not tainted (5.16.11-s3k-dev-01743-g19beecbfe9d6-dirty) [ 16.357849] MSR: 00029032 <EE,ME,IR,DR,RI> CR: 24002282 XER: 00000000 [ 16.357931] [ 16.357931] GPR00: c03fbc9c e68d9be0 c26d06a0 00000039 00000001 c0d36364 c0e96428 00000027 [ 16.357931] GPR08: 00000001 00000000 00000023 3fffc000 24002282 100d3dd6 100a2ffc 00000000 [ 16.357931] GPR16: 100cd280 100b0000 00000000 aff54f7e 100d0000 100d0000 00000001 100cf328 [ 16.357931] GPR24: 100cf328 00000000 00000003 e68d9e30 c156b410 e67ab4c0 e68d9d38 c24ab278 [ 16.358253] NIP [c03fbc9c] fsl_spi_cpm_bufs+0x2a0/0x2d8 [ 16.358292] LR [c03fbc9c] fsl_spi_cpm_bufs+0x2a0/0x2d8 [ 16.358325] Call Trace: [ 16.358336] [e68d9be0] [c03fbc9c] fsl_spi_cpm_bufs+0x2a0/0x2d8 (unreliable) [ 16.358388] [e68d9c00] [c03fcb44] fsl_spi_bufs.isra.0+0x94/0x1a0 [ 16.358436] [e68d9c20] [c03fd970] fsl_spi_do_one_msg+0x254/0x3dc [ 16.358483] [e68d9cb0] [c03f7e50] __spi_pump_messages+0x274/0x8a4 [ 16.358529] [e68d9ce0] [c03f9d30] __spi_sync+0x344/0x378 [ 16.358573] [e68d9d20] [c03fb52c] spi_sync+0x34/0x60 [ 16.358616] [e68d9d30] [c03b4dec] at25_ee_read+0x138/0x1a8 [ 16.358667] [e68d9e50] [c04a8fb8] bin_attr_nvmem_read+0x98/0x110 [ 16.358725] [e68d9e60] [c0204b14] kernfs_fop_read_iter+0xc0/0x1fc [ 16.358774] [e68d9e80] [c0168660] vfs_read+0x284/0x410 [ 16.358821] [e68d9f00] [c016925c] ksys_read+0x6c/0x11c [ 16.358863] [e68d9f30] [c00160e0] ret_from_syscall+0x0/0x28 ... [ 16.359608] ---[ end trace a4ce3e34afef0cb5 ]--- [ 16.359638] fsl_spi b01004c0.spi: unable to map tx dma This is due to the AT25 driver using buffers on stack, which is not possible with CONFIG_VMAP_STACK. As mentionned in kernel Documentation (Documentation/spi/spi-summary.rst): - Follow standard kernel rules, and provide DMA-safe buffers in your messages. That way controller drivers using DMA aren't forced to make extra copies unless the hardware requires it (e.g. working around hardware errata that force the use of bounce buffering). Modify the driver to use a buffer located in the at25 device structure which is allocated via kmalloc during probe. Protect writes in this new buffer with the driver's mutex. Fixes: b587b13a4f67 ("[PATCH] SPI eeprom driver") Cc: stable <stable@kernel.org> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Link: https://lore.kernel.org/r/230a9486fc68ea0182df46255e42a51099403642.1648032613.git.christophe.leroy@csgroup.eu Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 5b47b751b760ee1c74a51660fd096aa148a362cd upstream.

Reading EEPROM fails with following warning:

[   16.357496] ------------[ cut here ]------------
[   16.357529] fsl_spi b01004c0.spi: rejecting DMA map of vmalloc memory
[   16.357698] WARNING: CPU: 0 PID: 371 at include/linux/dma-mapping.h:326 fsl_spi_cpm_bufs+0x2a0/0x2d8
[   16.357775] CPU: 0 PID: 371 Comm: od Not tainted 5.16.11-s3k-dev-01743-g19beecbfe9d6-dirty #109
[   16.357806] NIP:  c03fbc9c LR: c03fbc9c CTR: 00000000
[   16.357825] REGS: e68d9b20 TRAP: 0700   Not tainted  (5.16.11-s3k-dev-01743-g19beecbfe9d6-dirty)
[   16.357849] MSR:  00029032 <EE,ME,IR,DR,RI>  CR: 24002282  XER: 00000000
[   16.357931]
[   16.357931] GPR00: c03fbc9c e68d9be0 c26d06a0 00000039 00000001 c0d36364 c0e96428 00000027
[   16.357931] GPR08: 00000001 00000000 00000023 3fffc000 24002282 100d3dd6 100a2ffc 00000000
[   16.357931] GPR16: 100cd280 100b0000 00000000 aff54f7e 100d0000 100d0000 00000001 100cf328
[   16.357931] GPR24: 100cf328 00000000 00000003 e68d9e30 c156b410 e67ab4c0 e68d9d38 c24ab278
[   16.358253] NIP [c03fbc9c] fsl_spi_cpm_bufs+0x2a0/0x2d8
[   16.358292] LR [c03fbc9c] fsl_spi_cpm_bufs+0x2a0/0x2d8
[   16.358325] Call Trace:
[   16.358336] [e68d9be0] [c03fbc9c] fsl_spi_cpm_bufs+0x2a0/0x2d8 (unreliable)
[   16.358388] [e68d9c00] [c03fcb44] fsl_spi_bufs.isra.0+0x94/0x1a0
[   16.358436] [e68d9c20] [c03fd970] fsl_spi_do_one_msg+0x254/0x3dc
[   16.358483] [e68d9cb0] [c03f7e50] __spi_pump_messages+0x274/0x8a4
[   16.358529] [e68d9ce0] [c03f9d30] __spi_sync+0x344/0x378
[   16.358573] [e68d9d20] [c03fb52c] spi_sync+0x34/0x60
[   16.358616] [e68d9d30] [c03b4dec] at25_ee_read+0x138/0x1a8
[   16.358667] [e68d9e50] [c04a8fb8] bin_attr_nvmem_read+0x98/0x110
[   16.358725] [e68d9e60] [c0204b14] kernfs_fop_read_iter+0xc0/0x1fc
[   16.358774] [e68d9e80] [c0168660] vfs_read+0x284/0x410
[   16.358821] [e68d9f00] [c016925c] ksys_read+0x6c/0x11c
[   16.358863] [e68d9f30] [c00160e0] ret_from_syscall+0x0/0x28
...
[   16.359608] ---[ end trace a4ce3e34afef0cb5 ]---
[   16.359638] fsl_spi b01004c0.spi: unable to map tx dma

This is due to the AT25 driver using buffers on stack, which is not
possible with CONFIG_VMAP_STACK.

As mentionned in kernel Documentation (Documentation/spi/spi-summary.rst):

  - Follow standard kernel rules, and provide DMA-safe buffers in
    your messages.  That way controller drivers using DMA aren't forced
    to make extra copies unless the hardware requires it (e.g. working
    around hardware errata that force the use of bounce buffering).

Modify the driver to use a buffer located in the at25 device structure
which is allocated via kmalloc during probe.

Protect writes in this new buffer with the driver's mutex.

Fixes: b587b13a4f67 ("[PATCH] SPI eeprom driver")
Cc: stable <stable@kernel.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/230a9486fc68ea0182df46255e42a51099403642.1648032613.git.christophe.leroy@csgroup.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
perf symbol: Remove arch__symbols__fixup_end() 2022-05-09T07:14:44+00:00 Namhyung Kim namhyung@kernel.org 2022-04-16T00:40:48+00:00 7d0010f628409b6c2b65013de97972b3934c2df9 commit a5d20d42a2f2dc2b2f9e9361912062732414090d upstream. Now the generic code can handle kallsyms fixup properly so no need to keep the arch-functions anymore. Fixes: 3cf6a32f3f2a4594 ("perf symbols: Fix symbol size calculation condition") Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Ian Rogers <irogers@google.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.garry@huawei.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Song Liu <songliubraving@fb.com> Cc: Will Deacon <will@kernel.org> Cc: linux-s390@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Link: https://lore.kernel.org/r/20220416004048.1514900-4-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit a5d20d42a2f2dc2b2f9e9361912062732414090d upstream.

Now the generic code can handle kallsyms fixup properly so no need to
keep the arch-functions anymore.

Fixes: 3cf6a32f3f2a4594 ("perf symbols: Fix symbol size calculation condition")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-s390@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lore.kernel.org/r/20220416004048.1514900-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
tty: n_gsm: fix software flow control handling 2022-05-09T07:14:44+00:00 Daniel Starke daniel.starke@siemens.com 2022-04-22T07:10:25+00:00 ea47db3bac7ad361845e350d2759e9d25b992353 commit f4f7d63287217ba25e5c80f5faae5e4f7118790e upstream. n_gsm is based on the 3GPP 07.010 and its newer version is the 3GPP 27.010. See https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1516 The changes from 07.010 to 27.010 are non-functional. Therefore, I refer to the newer 27.010 here. Chapter 5.4.8.1 states that XON/XOFF characters shall be used instead of Fcon/Fcoff command in advanced option mode to handle flow control. Chapter 5.4.8.2 describes how XON/XOFF characters shall be handled. Basic option mode only used Fcon/Fcoff commands and no XON/XOFF characters. These are treated as data bytes here. The current implementation uses the gsm_mux field 'constipated' to handle flow control from the remote peer and the gsm_dlci field 'constipated' to handle flow control from each DLCI. The later is unrelated to this patch. The gsm_mux field is correctly set for Fcon/Fcoff commands in gsm_control_message(). However, the same is not true for XON/XOFF characters in gsm1_receive(). Disable software flow control handling in the tty to allow explicit handling by n_gsm. Add the missing handling in advanced option mode for gsm_mux in gsm1_receive() to comply with the standard. This patch depends on the following commit: Commit 8838b2af23ca ("tty: n_gsm: fix SW flow control encoding/handling") Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke <daniel.starke@siemens.com> Link: https://lore.kernel.org/r/20220422071025.5490-3-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit f4f7d63287217ba25e5c80f5faae5e4f7118790e upstream.

n_gsm is based on the 3GPP 07.010 and its newer version is the 3GPP 27.010.
See https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1516
The changes from 07.010 to 27.010 are non-functional. Therefore, I refer to
the newer 27.010 here. Chapter 5.4.8.1 states that XON/XOFF characters
shall be used instead of Fcon/Fcoff command in advanced option mode to
handle flow control. Chapter 5.4.8.2 describes how XON/XOFF characters
shall be handled. Basic option mode only used Fcon/Fcoff commands and no
XON/XOFF characters. These are treated as data bytes here.
The current implementation uses the gsm_mux field 'constipated' to handle
flow control from the remote peer and the gsm_dlci field 'constipated' to
handle flow control from each DLCI. The later is unrelated to this patch.
The gsm_mux field is correctly set for Fcon/Fcoff commands in
gsm_control_message(). However, the same is not true for XON/XOFF
characters in gsm1_receive().
Disable software flow control handling in the tty to allow explicit
handling by n_gsm.
Add the missing handling in advanced option mode for gsm_mux in
gsm1_receive() to comply with the standard.

This patch depends on the following commit:
Commit 8838b2af23ca ("tty: n_gsm: fix SW flow control encoding/handling")

Fixes: e1eaea46bb40 ("tty: n_gsm line discipline")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220422071025.5490-3-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
tty: n_gsm: fix incorrect UA handling 2022-05-09T07:14:44+00:00 Daniel Starke daniel.starke@siemens.com 2022-04-14T09:42:25+00:00 ab49c23668ea6dd439c7539c301eacf6f970aea9 commit ff9166c623704337bd6fe66fce2838d9768a6634 upstream. n_gsm is based on the 3GPP 07.010 and its newer version is the 3GPP 27.010. See https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1516 The changes from 07.010 to 27.010 are non-functional. Therefore, I refer to the newer 27.010 here. Chapter 5.4.4.2 states that any received unnumbered acknowledgment (UA) with its poll/final (PF) bit set to 0 shall be discarded. Currently, all UA frame are handled in the same way regardless of the PF bit. This does not comply with the standard. Remove the UA case in gsm_queue() to process only UA frames with PF bit set to 1 to abide the standard. Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke <daniel.starke@siemens.com> Link: https://lore.kernel.org/r/20220414094225.4527-20-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit ff9166c623704337bd6fe66fce2838d9768a6634 upstream.

n_gsm is based on the 3GPP 07.010 and its newer version is the 3GPP 27.010.
See https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1516
The changes from 07.010 to 27.010 are non-functional. Therefore, I refer to
the newer 27.010 here. Chapter 5.4.4.2 states that any received unnumbered
acknowledgment (UA) with its poll/final (PF) bit set to 0 shall be
discarded. Currently, all UA frame are handled in the same way regardless
of the PF bit. This does not comply with the standard.
Remove the UA case in gsm_queue() to process only UA frames with PF bit set
to 1 to abide the standard.

Fixes: e1eaea46bb40 ("tty: n_gsm line discipline")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220414094225.4527-20-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
tty: n_gsm: fix reset fifo race condition 2022-05-09T07:14:44+00:00 Daniel Starke daniel.starke@siemens.com 2022-04-14T09:42:22+00:00 e0a84ae1c6624441cae1481754cf3fbf36f32e70 commit 73029a4d7161f8b6c0934553145ef574d2d0c645 upstream. gsmtty_write() and gsm_dlci_data_output() properly guard the fifo access. However, gsm_dlci_close() and gsmtty_flush_buffer() modifies the fifo but do not guard this. Add a guard here to prevent race conditions on parallel writes to the fifo. Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke <daniel.starke@siemens.com> Link: https://lore.kernel.org/r/20220414094225.4527-17-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 73029a4d7161f8b6c0934553145ef574d2d0c645 upstream.

gsmtty_write() and gsm_dlci_data_output() properly guard the fifo access.
However, gsm_dlci_close() and gsmtty_flush_buffer() modifies the fifo but
do not guard this.
Add a guard here to prevent race conditions on parallel writes to the fifo.

Fixes: e1eaea46bb40 ("tty: n_gsm line discipline")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220414094225.4527-17-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
tty: n_gsm: fix missing tty wakeup in convergence layer type 2 2022-05-09T07:14:43+00:00 Daniel Starke daniel.starke@siemens.com 2022-04-14T09:42:19+00:00 f92783b7568e2ece82259d5eb5b3197684ec86f2 commit 1adf6fee58ca25fb6720b8d34c919dcf5425cc9c upstream. gsm_control_modem() informs the virtual tty that more data can be written after receiving a control signal octet via modem status command (MSC). However, gsm_dlci_data() fails to do the same after receiving a control signal octet from the convergence layer type 2 header. Add tty_wakeup() in gsm_dlci_data() for convergence layer type 2 to fix this. Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke <daniel.starke@siemens.com> Link: https://lore.kernel.org/r/20220414094225.4527-14-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 1adf6fee58ca25fb6720b8d34c919dcf5425cc9c upstream.

gsm_control_modem() informs the virtual tty that more data can be written
after receiving a control signal octet via modem status command (MSC).
However, gsm_dlci_data() fails to do the same after receiving a control
signal octet from the convergence layer type 2 header.
Add tty_wakeup() in gsm_dlci_data() for convergence layer type 2 to fix
this.

Fixes: e1eaea46bb40 ("tty: n_gsm line discipline")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220414094225.4527-14-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>