Patch "pwm: Mark all devices as "might sleep"" has been added to the 4.4-stable tree

Patch "pwm: Mark all devices as "might sleep"" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    pwm: Mark all devices as "might sleep"

to the 4.4-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:
     pwm-mark-all-devices-as-might-sleep.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From ff01c944cfa939f3474c28d88223213494aedf0b Mon Sep 17 00:00:00 2001
From: Thierry Reding <thierry.reding@gmail.com>
Date: Thu, 21 Jan 2016 15:04:59 +0100
Subject: pwm: Mark all devices as "might sleep"

From: Thierry Reding <thierry.reding@gmail.com>

commit ff01c944cfa939f3474c28d88223213494aedf0b upstream.

Commit d1cd21427747 ("pwm: Set enable state properly on failed call to
enable") introduced a mutex that is needed to protect internal state of
PWM devices. Since that mutex is acquired in pwm_set_polarity() and in
pwm_enable() and might potentially block, all PWM devices effectively
become "might sleep".

It's rather pointless to keep the .can_sleep field around, but given
that there are external users let's postpone the removal for the next
release cycle.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fixes: d1cd21427747 ("pwm: Set enable state properly on failed call to enable")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>


---
 drivers/pwm/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -889,7 +889,7 @@ EXPORT_SYMBOL_GPL(devm_pwm_put);
   */
 bool pwm_can_sleep(struct pwm_device *pwm)
 {
-	return pwm->chip->can_sleep;
+	return true;
 }
 EXPORT_SYMBOL_GPL(pwm_can_sleep);
 


Patches currently in stable-queue which might be from thierry.reding@gmail.com are

queue-4.4/pwm-mark-all-devices-as-might-sleep.patch