linux-kernel - [PATCH 3.12 24/38] pwm: Fix device reference leak

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Message-Id: <3f198a91125faa59f80b68901947b5522fda7bb3.1481658746.git.jslaby@suse.cz>
Date:   Tue, 13 Dec 2016 20:52:50 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 24/38] pwm: Fix device reference leak

From: Johan Hovold <johan@...nel.org>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 0e1614ac84f1719d87bed577963bb8140d0c9ce8 upstream.

Make sure to drop the reference to the parent device taken by
class_find_device() after "unexporting" any children when deregistering
a PWM chip.

Fixes: 0733424c9ba9 ("pwm: Unexport children before chip removal")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Thierry Reding <thierry.reding@...il.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/pwm/sysfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 809b5ab9074c..60d74a666c62 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -364,6 +364,8 @@ void pwmchip_sysfs_unexport_children(struct pwm_chip *chip)
 		if (test_bit(PWMF_EXPORTED, &pwm->flags))
 			pwm_unexport_child(parent, pwm);
 	}
+
+	put_device(parent);
 }
 
 static int __init pwm_sysfs_init(void)
-- 
2.11.0