linux.git/drivers/iio/pressure, branch v4.9.209 Clone of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git iio: pressure: zpa2326: Remove always-true check which confuses gcc 2018-11-10T15:42:54+00:00 Geert Uytterhoeven geert@linux-m68k.org 2017-07-05T08:14:59+00:00 1680ca362dad7f0ae4db4ab8b20629dc015a85ba [ Upstream commit f61dfff2f5b9fcb087bf5c444bc44b444709588f ] With gcc 4.1.2: drivers/iio/pressure/zpa2326.c: In function ‘zpa2326_wait_oneshot_completion’: drivers/iio/pressure/zpa2326.c:868: warning: ‘ret’ may be used uninitialized in this function When testing for "timeout < 0", timeout is already guaranteed to be strict negative, so the branch is always taken, and ret is thus always initialized. But (some version of) gcc is not smart enough to notice. Remove the check to fix this. As there is no other code in between assigning the error codes and returning them, the error codes can be returned immediately, and the intermediate variable can be dropped. Drop the "else" to please checkpatch. Fixes: e7215fe4d51e69c9 ("iio: pressure: zpa2326: report interrupted case as failure") Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit f61dfff2f5b9fcb087bf5c444bc44b444709588f ]

With gcc 4.1.2:

    drivers/iio/pressure/zpa2326.c: In function ‘zpa2326_wait_oneshot_completion’:
    drivers/iio/pressure/zpa2326.c:868: warning: ‘ret’ may be used uninitialized in this function

When testing for "timeout < 0", timeout is already guaranteed to be
strict negative, so the branch is always taken, and ret is thus always
initialized.  But (some version of) gcc is not smart enough to notice.

Remove the check to fix this.
As there is no other code in between assigning the error codes and
returning them, the error codes can be returned immediately, and the
intermediate variable can be dropped.
Drop the "else" to please checkpatch.

Fixes: e7215fe4d51e69c9 ("iio: pressure: zpa2326: report interrupted case as failure")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
iio: pressure: bmp280: fix relative humidity unit 2018-08-24T11:12:31+00:00 Tomasz Duszynski tduszyns@gmail.com 2018-05-28T15:38:59+00:00 b4164f8c69cf6cd11e6859dd0065826fed4cb779 [ Upstream commit 13399ff25f179811ce9c1df1523eb39f9e4a4772 ] According to IIO ABI relative humidity reading should be returned in milli percent. This patch addresses that by applying proper scaling and returning integer instead of fractional format type specifier. Note that the fixes tag is before the driver was heavily refactored to introduce spi support, so the patch won't apply that far back. Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com> Fixes: 14beaa8f5ab1 ("iio: pressure: bmp280: add humidity support") Acked-by: Matt Ranostay <matt.ranostay@konsulko.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
[ Upstream commit 13399ff25f179811ce9c1df1523eb39f9e4a4772 ]

According to IIO ABI relative humidity reading should be
returned in milli percent.

This patch addresses that by applying proper scaling and
returning integer instead of fractional format type specifier.

Note that the fixes tag is before the driver was heavily refactored
to introduce spi support, so the patch won't apply that far back.

Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com>
Fixes: 14beaa8f5ab1 ("iio: pressure: bmp280: add humidity support")
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
iio: pressure: zpa2326: report interrupted case as failure 2018-04-13T17:47:56+00:00 Nicholas Mc Guire der.herr@hofr.at 2017-05-14T08:43:55+00:00 c5eb48c6331d8773d707facbb8950f8fd7ef1682 [ Upstream commit e7215fe4d51e69c9d2608ad0c409d48e844d0adc ] If the timeout-case prints a warning message then probably the interrupted case should also. Further, wait_for_completion_interruptible_timeout() returns long not int. Fixes: commit 03b262f2bbf4 ("iio:pressure: initial zpa2326 barometer support") Signed-off-by: Nicholas Mc Guire <der.herr@hofr.at> Signed-off-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
[ Upstream commit e7215fe4d51e69c9d2608ad0c409d48e844d0adc ]

If the timeout-case prints a warning message then probably the interrupted
case should also. Further, wait_for_completion_interruptible_timeout()
returns long not int.

Fixes: commit 03b262f2bbf4 ("iio:pressure: initial zpa2326 barometer support")
Signed-off-by: Nicholas Mc Guire <der.herr@hofr.at>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
iio: st_pressure: st_accel: pass correct platform data to init 2018-03-28T16:39:19+00:00 Michael Nosthoff committed@heine.so 2018-03-09T09:02:45+00:00 055c49dcf10fe7db6087037abb87728e7dc84192 commit 8b438686a001db64c21782d04ef68111e53c45d9 upstream. Commit 7383d44b added a pointer pdata which get set to the default platform_data when non was defined in the device. But it did not pass this pointer to the st_sensors_init_sensor call but still used the maybe uninitialized platform_data from dev. This breaks initialization when no platform_data is given and the optional st,drdy-int-pin devicetree option is not set. This commit fixes this. Cc: stable@vger.kernel.org Fixes: 7383d44b ("iio: st_pressure: st_accel: Initialise sensor platform data properly") Signed-off-by: Michael Nosthoff <committed@heine.so> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 8b438686a001db64c21782d04ef68111e53c45d9 upstream.

Commit 7383d44b added a pointer pdata which get set to the default
platform_data when non was defined in the device. But it did not
pass this pointer to the st_sensors_init_sensor call but still
used the maybe uninitialized platform_data from dev.

This breaks initialization when no platform_data is given and
the optional st,drdy-int-pin devicetree option is not set.

This commit fixes this.

Cc: stable@vger.kernel.org
Fixes: 7383d44b ("iio: st_pressure: st_accel: Initialise sensor platform data properly")
Signed-off-by: Michael Nosthoff <committed@heine.so>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
iio: st_pressure: st_accel: Initialise sensor platform data properly 2018-03-24T10:00:15+00:00 Shrirang Bagul shrirang.bagul@canonical.com 2017-04-19T14:05:00+00:00 19b0f2fad8ceb65480e8faf5cb8f7de015b94655 [ Upstream commit 7383d44b84c94aaca4bf695a6bd8a69f2295ef1a ] This patch fixes the sensor platform data initialisation for st_pressure and st_accel device drivers. Without this patch, the driver fails to register the sensors when the user removes and re-loads the driver. 1. Unload the kernel modules for st_pressure $ sudo rmmod st_pressure_i2c $ sudo rmmod st_pressure 2. Re-load the driver $ sudo insmod st_pressure $ sudo insmod st_pressure_i2c Signed-off-by: Jonathan Cameron <jic23@kernel.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
[ Upstream commit 7383d44b84c94aaca4bf695a6bd8a69f2295ef1a ]

This patch fixes the sensor platform data initialisation for st_pressure
and st_accel device drivers. Without this patch, the driver fails to
register the sensors when the user removes and re-loads the driver.

1. Unload the kernel modules for st_pressure
$ sudo rmmod st_pressure_i2c
$ sudo rmmod st_pressure

2. Re-load the driver
$ sudo insmod st_pressure
$ sudo insmod st_pressure_i2c

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
iio: pressure: ms5611: claim direct mode during oversampling changes 2017-11-15T14:53:14+00:00 Alison Schofield amsfield22@gmail.com 2017-01-20T20:22:58+00:00 87e4965cec6156351892ecf45251c8dec03cc752 [ Upstream commit 3bc1abcddb24f55b9c251e03caa4f9bd22ff748b ] Driver was checking for direct mode before changing oversampling ratios, but was not locking it. Use the claim/release helper functions to guarantee the device stays in direct mode while the oversampling ratios are being updated. Continue to use the drivers private state lock to protect against conflicting direct mode access of the state data. Signed-off-by: Alison Schofield <amsfield22@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
[ Upstream commit 3bc1abcddb24f55b9c251e03caa4f9bd22ff748b ]

Driver was checking for direct mode before changing oversampling
ratios, but was not locking it.  Use the claim/release helper
functions to guarantee the device stays in direct mode while the
oversampling ratios are being updated.  Continue to use the drivers
private state lock to protect against conflicting direct mode access
of the state data.

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
IIO: BME280: Updates to Humidity readings need ctrl_reg write! 2017-10-12T09:51:18+00:00 Colin Parker colin.parker@aclima.io 2017-08-28T23:21:39+00:00 f0865d60f3a54bd66356026c83cfa9ec564b18e3 commit 4b1f0c31f96c45e8521dd84aae50f2aa4aecfb7b upstream. The ctrl_reg register needs to be written after any write to the humidity registers. The value written to the ctrl_reg register does not necessarily need to change, but a write operation must occur. The regmap_update_bits functions will not write to a register if the register value matches the value to be written. This saves unnecessary bus operations. The change in this patch forces a bus write during the chip_config operation by switching to regmap_write_bits. This will fix issues where the Humidity Sensor Oversampling bits are not updated after initialization. Signed-off-by: Colin Parker <colin.parker@aclima.io> Acked-by: Andreas Klinger <ak@it-klinger.de> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 4b1f0c31f96c45e8521dd84aae50f2aa4aecfb7b upstream.

The ctrl_reg register needs to be written after any write to
the humidity registers. The value written to the ctrl_reg register
does not necessarily need to change, but a write operation must
occur.

The regmap_update_bits functions will not write to a register
if the register value matches the value to be written. This saves
unnecessary bus operations.  The change in this patch forces a bus
write during the chip_config operation by switching to
regmap_write_bits.

This will fix issues where the Humidity Sensor Oversampling bits
are not updated after initialization.

Signed-off-by: Colin Parker <colin.parker@aclima.io>
Acked-by: Andreas Klinger <ak@it-klinger.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
iio: st_pressure: Fix data sign 2017-06-24T05:11:14+00:00 Marcin Niestroj m.niestroj@grinn-global.com 2016-12-12T16:58:42+00:00 56251d138570b4c789ee8e55c4f58f8b658e8ea0 commit 1b211d48abaa0e12e6e6177c0316ff55d11fdfce upstream. Datasheet of each device (lps331ap, lps25h, lps001wp, lps22hb) says that the pressure and temperature data is a 2's complement. I'm sending this the slow way, as negative pressures on these are pretty unusual and the nature of the fixing of multiple device introduction patches will make it hard to apply to older kernels - Jonathan. Fixes: 217494e5b780 ("iio:pressure: Add STMicroelectronics pressures driver") Fixes: 2f5effcbd097 ("iio: pressure-core: st: Expand and rename LPS331AP's channel descriptor") Fixes: 7885a8ce6800 ("iio: pressure: st: Add support for new LPS001WP pressure sensor") Fixes: e039e2f5b4da ("iio:st_pressure:initial lps22hb sensor support") Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 1b211d48abaa0e12e6e6177c0316ff55d11fdfce upstream.

Datasheet of each device (lps331ap, lps25h, lps001wp, lps22hb) says that
the pressure and temperature data is a 2's complement.

I'm sending this the slow way, as negative pressures on these are pretty
unusual and the nature of the fixing of multiple device introduction patches
will make it hard to apply to older kernels - Jonathan.

Fixes: 217494e5b780 ("iio:pressure: Add STMicroelectronics pressures driver")
Fixes: 2f5effcbd097 ("iio: pressure-core: st: Expand and rename LPS331AP's channel descriptor")
Fixes: 7885a8ce6800 ("iio: pressure: st: Add support for new LPS001WP pressure sensor")
Fixes: e039e2f5b4da ("iio:st_pressure:initial lps22hb sensor support")
Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
IIO: bmp280-core.c: fix error in humidity calculation 2017-05-25T13:44:37+00:00 Andreas Klinger ak@it-klinger.de 2017-04-10T17:00:01+00:00 dfb450b2b66e4271c63c10f72c17e2a9967e511c commit ed3730c435f1a9f9559ed7762035d22d8a95adfe upstream. While calculating the compensation of the humidity there are negative values interpreted as unsigned because of unsigned variables used. These values as well as the constants need to be casted to signed as indicated by the documentation of the sensor. Signed-off-by: Andreas Klinger <ak@it-klinger.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Matt Ranostay <matt.ranostay@konsulko.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit ed3730c435f1a9f9559ed7762035d22d8a95adfe upstream.

While calculating the compensation of the humidity there are negative values
interpreted as unsigned because of unsigned variables used.  These values as
well as the constants need to be casted to signed as indicated by the
documentation of the sensor.

Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
iio: pressure: mpl3115: do not rely on structure field ordering 2017-03-12T05:41:48+00:00 Peter Rosin peda@axentia.se 2017-02-01T20:40:56+00:00 a34546c6234e77dc98f5ac40ad64ee5429c986e6 commit 9cf6cdba586ced75c69b8314b88b2d2f5ce9b3ed upstream. Fixes a regression triggered by a change in the layout of struct iio_chan_spec, but the real bug is in the driver which assumed a specific structure layout in the first place. Hint: the two bits were not OR:ed together as implied by the indentation prior to this patch, there was a comma between them, which accidentally moved the ..._SCALE bit to the next structure field. That field was .info_mask_shared_by_type before the _available attributes was added by commit 51239600074b ("iio:core: add a callback to allow drivers to provide _available attributes") and .info_mask_separate_available afterwards, and the regression happened. info_mask_shared_by_type is actually a better choice than the originally intended info_mask_separate for the ..._SCALE bit since a constant is returned from mpl3115_read_raw for the scale. Using info_mask_shared_by_type also preserves the behavior from before the regression and is therefore less likely to cause other interesting side effects. The above mentioned regression causes an unintended sysfs attibute to show up that is not backed by code, in turn causing the following NULL pointer defererence to happen on access. Segmentation fault Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = ecc3c000 [00000000] *pgd=87f91831 Internal error: Oops: 80000007 [#1] SMP ARM Modules linked in: CPU: 1 PID: 1051 Comm: cat Not tainted 4.10.0-rc5-00009-gffd8858-dirty #3 Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) task: ed54ec00 task.stack: ee2bc000 PC is at 0x0 LR is at iio_read_channel_info_avail+0x40/0x280 pc : [<00000000>] lr : [<c06fbc1c>] psr: a0070013 sp : ee2bdda8 ip : 00000000 fp : ee2bddf4 r10: c0a53c74 r9 : ed79f000 r8 : ee8d1018 r7 : 00001000 r6 : 00000fff r5 : ee8b9a00 r4 : ed79f000 r3 : ee2bddc4 r2 : ee2bddbc r1 : c0a86dcc r0 : ee8d1000 Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 10c5387d Table: 3cc3c04a DAC: 00000051 Process cat (pid: 1051, stack limit = 0xee2bc210) Stack: (0xee2bdda8 to 0xee2be000) dda0: ee2bddc0 00000002 c016d720 c016d394 ed54ec00 00000000 ddc0: 60070013 ed413780 00000001 edffd480 ee8b9a00 00000fff 00001000 ee8d1018 dde0: ed79f000 c0a53c74 ee2bde0c ee2bddf8 c0513c58 c06fbbe8 edffd480 edffd540 de00: ee2bde3c ee2bde10 c0293474 c0513c40 c02933e4 ee2bde60 00000001 ed413780 de20: 00000001 ed413780 00000000 edffd480 ee2bde4c ee2bde40 c0291d00 c02933f0 de40: ee2bde9c ee2bde50 c024679c c0291ce0 edffd4b0 b6e37000 00020000 ee2bdf78 de60: 00000000 00000000 ed54ec00 ed013200 00000817 c0a111fc edffd540 ed413780 de80: b6e37000 00020000 00020000 ee2bdf78 ee2bded4 ee2bdea0 c0292890 c0246604 dea0: c0117940 c016ba50 00000025 c0a111fc b6e37000 ed413780 ee2bdf78 00020000 dec0: ee2bc000 b6e37000 ee2bdf44 ee2bded8 c021d158 c0292770 c0117764 b6e36004 dee0: c0f0d7c4 ee2bdfb0 b6f89228 00021008 ee2bdfac ee2bdf00 c0101374 c0117770 df00: 00000000 00000000 ee2bc000 00000000 ee2bdf34 ee2bdf20 c016ba04 c0171080 df20: 00000000 00020000 ed413780 b6e37000 00000000 ee2bdf78 ee2bdf74 ee2bdf48 df40: c021e7a0 c021d130 c023e300 c023e280 ee2bdf74 00000000 00000000 ed413780 df60: ed413780 00020000 ee2bdfa4 ee2bdf78 c021e870 c021e71c 00000000 00000000 df80: 00020000 00020000 b6e37000 00000003 c0108084 00000000 00000000 ee2bdfa8 dfa0: c0107ee0 c021e838 00020000 00020000 00000003 b6e37000 00020000 0001a2b4 dfc0: 00020000 00020000 b6e37000 00000003 7fffe000 00000000 00000000 00020000 dfe0: 00000000 be98eb4c 0000c740 b6f1985c 60070010 00000003 00000000 00000000 Backtrace: [<c06fbbdc>] (iio_read_channel_info_avail) from [<c0513c58>] (dev_attr_show+0x24/0x50) r10:c0a53c74 r9:ed79f000 r8:ee8d1018 r7:00001000 r6:00000fff r5:ee8b9a00 r4:edffd480 [<c0513c34>] (dev_attr_show) from [<c0293474>] (sysfs_kf_seq_show+0x90/0x110) r5:edffd540 r4:edffd480 [<c02933e4>] (sysfs_kf_seq_show) from [<c0291d00>] (kernfs_seq_show+0x2c/0x30) r10:edffd480 r9:00000000 r8:ed413780 r7:00000001 r6:ed413780 r5:00000001 r4:ee2bde60 r3:c02933e4 [<c0291cd4>] (kernfs_seq_show) from [<c024679c>] (seq_read+0x1a4/0x4e0) [<c02465f8>] (seq_read) from [<c0292890>] (kernfs_fop_read+0x12c/0x1cc) r10:ee2bdf78 r9:00020000 r8:00020000 r7:b6e37000 r6:ed413780 r5:edffd540 r4:c0a111fc [<c0292764>] (kernfs_fop_read) from [<c021d158>] (__vfs_read+0x34/0x118) r10:b6e37000 r9:ee2bc000 r8:00020000 r7:ee2bdf78 r6:ed413780 r5:b6e37000 r4:c0a111fc [<c021d124>] (__vfs_read) from [<c021e7a0>] (vfs_read+0x90/0x11c) r8:ee2bdf78 r7:00000000 r6:b6e37000 r5:ed413780 r4:00020000 [<c021e710>] (vfs_read) from [<c021e870>] (SyS_read+0x44/0x90) r8:00020000 r7:ed413780 r6:ed413780 r5:00000000 r4:00000000 [<c021e82c>] (SyS_read) from [<c0107ee0>] (ret_fast_syscall+0x0/0x1c) r10:00000000 r8:c0108084 r7:00000003 r6:b6e37000 r5:00020000 r4:00020000 Code: bad PC value ---[ end trace 9c4938ccd0389004 ]--- Fixes: cc26ad455f57 ("iio: Add Freescale MPL3115A2 pressure / temperature sensor driver") Fixes: 51239600074b ("iio:core: add a callback to allow drivers to provide _available attributes") Reported-by: Ken Lin <ken.lin@advantech.com> Tested-by: Ken Lin <ken.lin@advantech.com> Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 9cf6cdba586ced75c69b8314b88b2d2f5ce9b3ed upstream.

Fixes a regression triggered by a change in the layout of
struct iio_chan_spec, but the real bug is in the driver which assumed
a specific structure layout in the first place. Hint: the two bits were
not OR:ed together as implied by the indentation prior to this patch,
there was a comma between them, which accidentally moved the ..._SCALE
bit to the next structure field. That field was .info_mask_shared_by_type
before the _available attributes was added by commit 51239600074b
("iio:core: add a callback to allow drivers to provide _available
attributes") and .info_mask_separate_available afterwards, and the
regression happened.

info_mask_shared_by_type is actually a better choice than the originally
intended info_mask_separate for the ..._SCALE bit since a constant is
returned from mpl3115_read_raw for the scale. Using
info_mask_shared_by_type also preserves the behavior from before the
regression and is therefore less likely to cause other interesting side
effects.

The above mentioned regression causes an unintended sysfs attibute to
show up that is not backed by code, in turn causing the following NULL
pointer defererence to happen on access.

Segmentation fault

Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = ecc3c000
[00000000] *pgd=87f91831
Internal error: Oops: 80000007 [#1] SMP ARM
Modules linked in:
CPU: 1 PID: 1051 Comm: cat Not tainted 4.10.0-rc5-00009-gffd8858-dirty #3
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
task: ed54ec00 task.stack: ee2bc000
PC is at 0x0
LR is at iio_read_channel_info_avail+0x40/0x280
pc : [<00000000>]    lr : [<c06fbc1c>]    psr: a0070013
sp : ee2bdda8  ip : 00000000  fp : ee2bddf4
r10: c0a53c74  r9 : ed79f000  r8 : ee8d1018
r7 : 00001000  r6 : 00000fff  r5 : ee8b9a00  r4 : ed79f000
r3 : ee2bddc4  r2 : ee2bddbc  r1 : c0a86dcc  r0 : ee8d1000
Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 10c5387d  Table: 3cc3c04a  DAC: 00000051
Process cat (pid: 1051, stack limit = 0xee2bc210)
Stack: (0xee2bdda8 to 0xee2be000)
dda0:                   ee2bddc0 00000002 c016d720 c016d394 ed54ec00 00000000
ddc0: 60070013 ed413780 00000001 edffd480 ee8b9a00 00000fff 00001000 ee8d1018
dde0: ed79f000 c0a53c74 ee2bde0c ee2bddf8 c0513c58 c06fbbe8 edffd480 edffd540
de00: ee2bde3c ee2bde10 c0293474 c0513c40 c02933e4 ee2bde60 00000001 ed413780
de20: 00000001 ed413780 00000000 edffd480 ee2bde4c ee2bde40 c0291d00 c02933f0
de40: ee2bde9c ee2bde50 c024679c c0291ce0 edffd4b0 b6e37000 00020000 ee2bdf78
de60: 00000000 00000000 ed54ec00 ed013200 00000817 c0a111fc edffd540 ed413780
de80: b6e37000 00020000 00020000 ee2bdf78 ee2bded4 ee2bdea0 c0292890 c0246604
dea0: c0117940 c016ba50 00000025 c0a111fc b6e37000 ed413780 ee2bdf78 00020000
dec0: ee2bc000 b6e37000 ee2bdf44 ee2bded8 c021d158 c0292770 c0117764 b6e36004
dee0: c0f0d7c4 ee2bdfb0 b6f89228 00021008 ee2bdfac ee2bdf00 c0101374 c0117770
df00: 00000000 00000000 ee2bc000 00000000 ee2bdf34 ee2bdf20 c016ba04 c0171080
df20: 00000000 00020000 ed413780 b6e37000 00000000 ee2bdf78 ee2bdf74 ee2bdf48
df40: c021e7a0 c021d130 c023e300 c023e280 ee2bdf74 00000000 00000000 ed413780
df60: ed413780 00020000 ee2bdfa4 ee2bdf78 c021e870 c021e71c 00000000 00000000
df80: 00020000 00020000 b6e37000 00000003 c0108084 00000000 00000000 ee2bdfa8
dfa0: c0107ee0 c021e838 00020000 00020000 00000003 b6e37000 00020000 0001a2b4
dfc0: 00020000 00020000 b6e37000 00000003 7fffe000 00000000 00000000 00020000
dfe0: 00000000 be98eb4c 0000c740 b6f1985c 60070010 00000003 00000000 00000000
Backtrace:
[<c06fbbdc>] (iio_read_channel_info_avail) from [<c0513c58>] (dev_attr_show+0x24/0x50)
 r10:c0a53c74 r9:ed79f000 r8:ee8d1018 r7:00001000 r6:00000fff r5:ee8b9a00
 r4:edffd480
[<c0513c34>] (dev_attr_show) from [<c0293474>] (sysfs_kf_seq_show+0x90/0x110)
 r5:edffd540 r4:edffd480
[<c02933e4>] (sysfs_kf_seq_show) from [<c0291d00>] (kernfs_seq_show+0x2c/0x30)
 r10:edffd480 r9:00000000 r8:ed413780 r7:00000001 r6:ed413780 r5:00000001
 r4:ee2bde60 r3:c02933e4
[<c0291cd4>] (kernfs_seq_show) from [<c024679c>] (seq_read+0x1a4/0x4e0)
[<c02465f8>] (seq_read) from [<c0292890>] (kernfs_fop_read+0x12c/0x1cc)
 r10:ee2bdf78 r9:00020000 r8:00020000 r7:b6e37000 r6:ed413780 r5:edffd540
 r4:c0a111fc
[<c0292764>] (kernfs_fop_read) from [<c021d158>] (__vfs_read+0x34/0x118)
 r10:b6e37000 r9:ee2bc000 r8:00020000 r7:ee2bdf78 r6:ed413780 r5:b6e37000
 r4:c0a111fc
[<c021d124>] (__vfs_read) from [<c021e7a0>] (vfs_read+0x90/0x11c)
 r8:ee2bdf78 r7:00000000 r6:b6e37000 r5:ed413780 r4:00020000
[<c021e710>] (vfs_read) from [<c021e870>] (SyS_read+0x44/0x90)
 r8:00020000 r7:ed413780 r6:ed413780 r5:00000000 r4:00000000
[<c021e82c>] (SyS_read) from [<c0107ee0>] (ret_fast_syscall+0x0/0x1c)
 r10:00000000 r8:c0108084 r7:00000003 r6:b6e37000 r5:00020000 r4:00020000
Code: bad PC value
---[ end trace 9c4938ccd0389004 ]---

Fixes: cc26ad455f57 ("iio: Add Freescale MPL3115A2 pressure / temperature sensor driver")
Fixes: 51239600074b ("iio:core: add a callback to allow drivers to provide _available attributes")
Reported-by: Ken Lin <ken.lin@advantech.com>
Tested-by: Ken Lin <ken.lin@advantech.com>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>