From 502396fe598126ffd91f962d53a507aa6c7276fc Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Sat, 15 Aug 2020 16:37:43 +0200 Subject: [PATCH v2] pwm: img: Fix null pointer access in probe dev_get_drvdata() is called in img_pwm_runtime_resume() before the driver data is set. When pm_runtime_enabled() returns false in img_pwm_probe() it calls img_pwm_runtime_resume() which results in a null pointer access. This patch fixes the problem by setting the driver data earlier in the img_pwm_probe() function. This crash was seen when booting the Imagination Technologies Creator Ci40 (Marduk) with kernel 5.4 in OpenWrt. Fixes: e690ae526216 ("pwm: img: Add runtime PM") Signed-off-by: Hauke Mehrtens Acked-by: Lee Jones --- drivers/pwm/pwm-img.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/pwm/pwm-img.c +++ b/drivers/pwm/pwm-img.c @@ -277,6 +277,8 @@ static int img_pwm_probe(struct platform return PTR_ERR(pwm->pwm_clk); } + platform_set_drvdata(pdev, pwm); + pm_runtime_set_autosuspend_delay(&pdev->dev, IMG_PWM_PM_TIMEOUT); pm_runtime_use_autosuspend(&pdev->dev); pm_runtime_enable(&pdev->dev); @@ -313,7 +315,6 @@ static int img_pwm_probe(struct platform goto err_suspend; } - platform_set_drvdata(pdev, pwm); return 0; err_suspend: