backlight: pwm: Handle EPROBE_DEFER while requesting the PWM

When trying to request the PWM device with devm_pwm_get(), the EPROBE_DEFER
flag is not handled properly. It can lead to the PWM not being found.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 3a145a643e0d..6897f1c1bc73 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -274,6 +274,10 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 
         pb->pwm = devm_pwm_get(&pdev->dev, NULL);
         if (IS_ERR(pb->pwm)) {
+                ret = PTR_ERR(pb->pwm);
+                if (ret == -EPROBE_DEFER)
+                        goto err_alloc;
+
                 dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
                 pb->legacy = true;
                 pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");