This is a note to let you know that I've just added the patch titled
iio: pressure: mpl115: do not rely on structure field ordering
to the 4.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-pressure-mpl115-do-not-rely-on-structure-field-ordering.patch
and it can be found in the queue-4.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6a6e1d56a0769795a36c0461c64bf5e5b9bbb4c0 Mon Sep 17 00:00:00 2001
From: Peter Rosin <peda@xxxxxxxxxx>
Date: Wed, 1 Feb 2017 21:40:57 +0100
Subject: iio: pressure: mpl115: do not rely on structure field ordering
From: Peter Rosin <peda@xxxxxxxxxx>
commit 6a6e1d56a0769795a36c0461c64bf5e5b9bbb4c0 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 three bits were
not OR:ed together as implied by the indentation prior to this patch,
there was a comma between the first two, which accidentally moved the
..._SCALE and ..._OFFSET bits 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 and ..._OFFSET bits since
a constant is returned from mpl115_read_raw for the scale/offset. 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 unintended sysfs attibutes to
show up that are not backed by code, in turn causing a NULL pointer
defererence to happen on access.
Fixes: 3017d90e8931 ("iio: Add Freescale MPL115A2 pressure / temperature sensor driver")
Fixes: 51239600074b ("iio:core: add a callback to allow drivers to provide _available attributes")
Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/pressure/mpl115.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/iio/pressure/mpl115.c
+++ b/drivers/iio/pressure/mpl115.c
@@ -137,6 +137,7 @@ static const struct iio_chan_spec mpl115
{
.type = IIO_TEMP,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type =
BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE),
},
};
Patches currently in stable-queue which might be from peda@xxxxxxxxxx are
queue-4.10/iio-pressure-mpl3115-do-not-rely-on-structure-field-ordering.patch
queue-4.10/iio-pressure-mpl115-do-not-rely-on-structure-field-ordering.patch