led_bl does not lock 'led_access' when calling led_sysfs_disable and
led_sysfs_enable, causing the below WARN. Add the locking.
WARNING: CPU: 0 PID: 223 at drivers/leds/led-core.c:353
led_sysfs_disable+0x4c/0x5c
Signed-off-by: Tomi Valkeinen <tomi.valkei...@ti.com>
Reviewed-by: Daniel Thompson <daniel.thomp...@linaro.org>
---
drivers/video/backlight/led_bl.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
index c46ecdfe8b0a..63693c4f0883 100644
--- a/drivers/video/backlight/led_bl.c
+++ b/drivers/video/backlight/led_bl.c
@@ -216,8 +216,11 @@ static int led_bl_probe(struct platform_device *pdev)
return PTR_ERR(priv->bl_dev);
}
- for (i = 0; i < priv->nb_leds; i++)
+ for (i = 0; i < priv->nb_leds; i++) {
+ mutex_lock(&priv->leds[i]->led_access);
led_sysfs_disable(priv->leds[i]);
+ mutex_unlock(&priv->leds[i]->led_access);
+ }
backlight_update_status(priv->bl_dev);
@@ -233,8 +236,11 @@ static int led_bl_remove(struct platform_device *pdev)
backlight_device_unregister(bl);
led_bl_power_off(priv);
- for (i = 0; i < priv->nb_leds; i++)
+ for (i = 0; i < priv->nb_leds; i++) {
+ mutex_lock(&priv->leds[i]->led_access);
led_sysfs_enable(priv->leds[i]);
+ mutex_unlock(&priv->leds[i]->led_access);
+ }
return 0;
}
--
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