When the pwm driver is unbound, the pwm_bl driver would still hold a reference to that pwm, and crash the kernel later(if someone trying to access that invalid pwm).
Add a device link to avoid this.
Signed-off-by: Jeffy Chen jeffy.chen@rock-chips.com ---
Changes in v2: None
drivers/video/backlight/pwm_bl.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 9bd17682655a..a76f147a26e7 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -328,6 +328,8 @@ static int pwm_backlight_probe(struct platform_device *pdev) goto err_alloc; }
+ device_link_add(&pdev->dev, pb->pwm->chip->dev, DL_FLAG_AUTOREMOVE); + dev_dbg(&pdev->dev, "got pwm for backlight\n");
/*