p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

regulator: wm831x isink: Fix notifier mutex lock warning 

The mutex for the regulator_dev must be controlled by the caller of
the regulator_notifier_call_chain(), as described in the comment
for that function.

Failure to mutex lock and unlock surrounding the notifier call results
in a kernel WARN_ON_ONCE() which will dump a backtrace for the
regulator_notifier_call_chain() when that function call is first made.
The mutex can be controlled using the regulator_lock/unlock() API.

Fixes: d4d6b722e7 ("regulator: Add WM831x ISINK support")
Suggested-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Steve Twiss 2019-02-26 15:51:28 +00:00 committed by Mark Brown
parent ae15c519a6
commit f7a621728a
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/regulator/wm831x-isink.c
View File

@ -140,9 +140,11 @@ static irqreturn_t wm831x_isink_irq(int irq, void *data)
{
struct wm831x_isink *isink = data;
regulator_lock(isink->regulator);
regulator_notifier_call_chain(isink->regulator,
REGULATOR_EVENT_OVER_CURRENT,
NULL);
regulator_unlock(isink->regulator);
return IRQ_HANDLED;
}