This is a note to let you know that I've just added the patch titled
iio: pressure: bmp280: fix runtime suspend/resume crash
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 31f453eac56bdc41f434126bc2d5933b9fb720ec Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@xxxxxxxxxx>
Date: Wed, 27 Jul 2016 22:32:58 +0200
Subject: iio: pressure: bmp280: fix runtime suspend/resume crash
In commit 3d838118c6aa ("iio: pressure: bmp280: add power management")
For some reason the code in the runtime suspend/resume hooks
got wrong (I suspect in the ambition to cut down boilerplate)
and it seems it was tested without CONFIG_PM and crashes like
so for me:
Unable to handle kernel NULL pointer dereference at virtual address 0000000c
pgd = c0204000
[0000000c] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 89 Comm: kworker/1:2 Not tainted
4.7.0-03348-g90dc3680458a-dirty #99
Hardware name: Generic DT based system
Workqueue: pm pm_runtime_work
task: df3c6300 ti: dec8a000 task.ti: dec8a000
PC is at regulator_disable+0x0/0x6c
LR is at bmp280_runtime_suspend+0x3c/0xa4
Dereferencing the BMP280 state container properly fixes the problem,
sorry for screwing up.
Fixes: 3d838118c6aa ("iio: pressure: bmp280: add power management")
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Tested-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
---
drivers/iio/pressure/bmp280-core.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index 94e27b2600f3..e5a533cbd53f 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -1079,7 +1079,8 @@ EXPORT_SYMBOL(bmp280_common_remove);
#ifdef CONFIG_PM
static int bmp280_runtime_suspend(struct device *dev)
{
- struct bmp280_data *data = dev_get_drvdata(dev);
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct bmp280_data *data = iio_priv(indio_dev);
int ret;
ret = regulator_disable(data->vdda);
@@ -1090,7 +1091,8 @@ static int bmp280_runtime_suspend(struct device *dev)
static int bmp280_runtime_resume(struct device *dev)
{
- struct bmp280_data *data = dev_get_drvdata(dev);
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct bmp280_data *data = iio_priv(indio_dev);
int ret;
ret = regulator_enable(data->vddd);
--
2.9.3
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