From: Ryo Kodama <ryo.kodama.vz@renesas.com>
Date: Wed, 8 Jun 2016 01:58:23 +0000 (+0900)
Subject: UPSTREAM: pwm: sysfs: Get return value from pwm_apply_state()
X-Git-Tag: firefly_0821_release~434
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9d523c146299c8c32204b1e94c664a3e18b8ad78;p=firefly-linux-kernel-4.4.55.git

UPSTREAM: pwm: sysfs: Get return value from pwm_apply_state()

This patch adds to check the return value from pwm_apply_state()
used in enable_store(). The error of enable_store() doesn't work
if the return value doesn't received.

Signed-off-by: Ryo Kodama <ryo.kodama.vz@renesas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Fixes: 39100ceea79f ("pwm: Switch to the atomic API")
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
(cherry picked from commit fe5aa34d6eb9c4d34071845f70f3714b41c8a77d)

Change-Id: I550da28345bcee7a6aa8e1f9b5c43adae923ff2d
Signed-off-by: David Wu <david.wu@rock-chips.com>
---

diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 850ff5fa9e38..2cb39f17a54a 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -152,7 +152,7 @@ static ssize_t enable_store(struct device *child,
 		goto unlock;
 	}
 
-	pwm_apply_state(pwm, &state);
+	ret = pwm_apply_state(pwm, &state);
 
 unlock:
 	mutex_unlock(&export->lock);