This is a note to let you know that I've just added the patch titled
iio:humidity:hts221: rearrange iio trigger get and register
to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-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 10b9c2c33ac706face458feab8965f11743c98c0 Mon Sep 17 00:00:00 2001
From: Dmitry Rokosov <DDRokosov@xxxxxxxxxxxxxx>
Date: Tue, 24 May 2022 18:14:46 +0000
Subject: iio:humidity:hts221: rearrange iio trigger get and register
IIO trigger interface function iio_trigger_get() should be called after
iio_trigger_register() (or its devm analogue) strictly, because of
iio_trigger_get() acquires module refcnt based on the trigger->owner
pointer, which is initialized inside iio_trigger_register() to
THIS_MODULE.
If this call order is wrong, the next iio_trigger_put() (from sysfs
callback or "delete module" path) will dereference "default" module
refcnt, which is incorrect behaviour.
Fixes: e4a70e3e7d84 ("iio: humidity: add support to hts221 rh/temp combo device")
Signed-off-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220524181150.9240-6-ddrokosov@xxxxxxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
drivers/iio/humidity/hts221_buffer.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/humidity/hts221_buffer.c b/drivers/iio/humidity/hts221_buffer.c
index f29692b9d2db..66b32413cf5e 100644
--- a/drivers/iio/humidity/hts221_buffer.c
+++ b/drivers/iio/humidity/hts221_buffer.c
@@ -135,9 +135,12 @@ int hts221_allocate_trigger(struct iio_dev *iio_dev)
iio_trigger_set_drvdata(hw->trig, iio_dev);
hw->trig->ops = &hts221_trigger_ops;
+
+ err = devm_iio_trigger_register(hw->dev, hw->trig);
+
iio_dev->trig = iio_trigger_get(hw->trig);
- return devm_iio_trigger_register(hw->dev, hw->trig);
+ return err;
}
static int hts221_buffer_preenable(struct iio_dev *iio_dev)
--
2.36.1
