linux-kernel - [PATCH] backlight: pwm: handle EPROBE

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Date:	Thu, 19 Feb 2015 10:30:14 +0100
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-pwm@...r.kernel.org>, <thierry.reding@...il.com>,
	<lee.jones@...aro.org>, <jg1.han@...sung.com>
CC:	<linux-kernel@...r.kernel.org>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>
Subject: [PATCH] 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@...e-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
---
 drivers/video/backlight/pwm_bl.c | 4 ++++
 1 file changed, 4 insertions(+)

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");
-- 
2.1.3

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