Messages in this thread Patch in this message | | | From | Jeffy Chen <> | Subject | [RESEND PATCH v2 2/5] backlight: pwm_bl: Add device link for pwm_bl and pwm | Date | Mon, 16 Oct 2017 18:06:37 +0800 |
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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"); /* -- 2.11.0
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