linux-kernel - [PATCH AUTOSEL for-3.18 18/27] backlight: lcd: Fix race condition during register

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Message-ID: <20171108205049.27612-18-alexander.levin@verizon.com>
Date:   Wed, 8 Nov 2017 20:50:59 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        "Lee Jones" <lee.jones@...aro.org>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com>
Subject: [PATCH AUTOSEL for-3.18 18/27] backlight: lcd: Fix race condition
 during register

From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

[ Upstream commit cc21942bce652d1a92dae85b785378256e1df1f7 ]

Once device_register is called for a device its attributes might be
accessed. As the callbacks of a lcd device's attributes make use of the
lcd_ops, the respective member must be setup before calling
device_register.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/video/backlight/lcd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
index 7de847df224f..4b40c6a4d441 100644
--- a/drivers/video/backlight/lcd.c
+++ b/drivers/video/backlight/lcd.c
@@ -226,6 +226,8 @@ struct lcd_device *lcd_device_register(const char *name, struct device *parent,
 	dev_set_name(&new_ld->dev, "%s", name);
 	dev_set_drvdata(&new_ld->dev, devdata);
 
+	new_ld->ops = ops;
+
 	rc = device_register(&new_ld->dev);
 	if (rc) {
 		put_device(&new_ld->dev);
@@ -238,8 +240,6 @@ struct lcd_device *lcd_device_register(const char *name, struct device *parent,
 		return ERR_PTR(rc);
 	}
 
-	new_ld->ops = ops;
-
 	return new_ld;
 }
 EXPORT_SYMBOL(lcd_device_register);
-- 
2.11.0