linux.git/drivers/parisc, branch v6.1.168

parisc: Do not reprogram affinitiy on ASP chip

2026-01-11T14:18:54+00:00

commit dca7da244349eef4d78527cafc0bf80816b261f5 upstream.

The ASP chip is a very old variant of the GSP chip and is used e.g. in
HP 730 workstations. When trying to reprogram the affinity it will crash
with a HPMC as the relevant registers don't seem to be at the usual
location.  Let's avoid the crash by checking the sversion. Also note,
that reprogramming isn't necessary either, as the HP730 is a just a
single-CPU machine.

Signed-off-by: Helge Deller 
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman

parisc/power: Fix power soft-off button emulation on qemu

2024-02-01T00:16:59+00:00

commit 6472036581f947109b20664121db1d143e916f0b upstream.

Make sure to start the kthread to check the power button on qemu as
well if the power button address was provided.
This fixes the qemu built-in system_powerdown runtime command.

Fixes: d0c219472980 ("parisc/power: Add power soft-off when running on qemu")
Signed-off-by: Helge Deller 
Cc: stable@vger.kernel.org # v6.0+
Signed-off-by: Greg Kroah-Hartman

parisc/power: Fix power soft-off when running on qemu

2023-11-28T17:07:14+00:00

commit 6ad6e15a9c46b8f0932cd99724f26f3db4db1cdf upstream.

Firmware returns the physical address of the power switch,
so need to use gsc_writel() instead of direct memory access.

Fixes: d0c219472980 ("parisc/power: Add power soft-off when running on qemu")
Signed-off-by: Helge Deller 
Cc: stable@vger.kernel.org # v6.0+
Signed-off-by: Greg Kroah-Hartman

parisc/power: Add power soft-off when running on qemu

2023-11-28T17:07:10+00:00

commit d0c219472980d15f5cbc5c8aec736848bda3f235 upstream.

Signed-off-by: Helge Deller 
Cc: stable@vger.kernel.org # v6.0+
Signed-off-by: Greg Kroah-Hartman

parisc: iosapic.c: Fix sparse warnings

2023-10-06T12:56:51+00:00

[ Upstream commit 927c6c8aa27c284a799b8c18784e37d3373af908 ]

Signed-off-by: Helge Deller 
Signed-off-by: Sasha Levin

parisc: led: Reduce CPU overhead for disk & lan LED computation

2023-09-19T10:27:57+00:00

commit 358ad816e52d4253b38c2f312e6b1cbd89e0dbf7 upstream.

Older PA-RISC machines have LEDs which show the disk- and LAN-activity.
The computation is done in software and takes quite some time, e.g. on a
J6500 this may take up to 60% time of one CPU if the machine is loaded
via network traffic.

Since most people don't care about the LEDs, start with LEDs disabled and
just show a CPU heartbeat LED. The disk and LAN LEDs can be turned on
manually via /proc/pdc/led.

Signed-off-by: Helge Deller 
Cc: 
Signed-off-by: Greg Kroah-Hartman

parisc: Replace regular spinlock with spin_trylock on panic path

2023-05-24T16:32:42+00:00

[ Upstream commit 829632dae8321787525ee37dc4828bbe6edafdae ]

The panic notifiers' callbacks execute in an atomic context, with
interrupts/preemption disabled, and all CPUs not running the panic
function are off, so it's very dangerous to wait on a regular
spinlock, there's a risk of deadlock.

Refactor the panic notifier of parisc/power driver to make use
of spin_trylock - for that, we've added a second version of the
soft-power function. Also, some comments were reorganized and
trailing white spaces, useless header inclusion and blank lines
were removed.

Cc: "James E.J. Bottomley" 
Cc: Jeroen Roovers 
Acked-by: Helge Deller  # parisc
Signed-off-by: Guilherme G. Piccoli 
Signed-off-by: Helge Deller 
Signed-off-by: Sasha Levin

parisc: led: Fix potential null-ptr-deref in start_task()

2023-01-07T10:11:55+00:00

commit 41f563ab3c33698bdfc3403c7c2e6c94e73681e4 upstream.

start_task() calls create_singlethread_workqueue() and not checked the
ret value, which may return NULL. And a null-ptr-deref may happen:

start_task()
    create_singlethread_workqueue() # failed, led_wq is NULL
    queue_delayed_work()
        queue_delayed_work_on()
            __queue_delayed_work()  # warning here, but continue
                __queue_work()      # access wq->flags, null-ptr-deref

Check the ret value and return -ENOMEM if it is NULL.

Fixes: 3499495205a6 ("[PARISC] Use work queue in LED/LCD driver instead of tasklet.")
Signed-off-by: Shang XiaoJing 
Signed-off-by: Helge Deller 
Cc: 
Signed-off-by: Greg Kroah-Hartman

parisc: Export iosapic_serial_irq() symbol for serial port driver

2022-10-27T07:12:05+00:00

The parisc serial port driver needs this symbol when it's compiled
as module.

Signed-off-by: Helge Deller 
Reported-by: kernel test robot 
Cc:

parisc: Use signed char for hardware path in pdc.h

2022-10-21T07:15:20+00:00

Clean up the struct for hardware_path and drop the struct device_path
with a proper assignment of bc[] and mod members as signed chars.

This patch prepares for the kbuild change from Jason A. Donenfeld to
treat char as always unsigned.

Signed-off-by: Helge Deller 
Cc: Jason A. Donenfeld