linux-kernel - [PATCH] drm/tegra: dpaux: Fix error handling

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Date:   Fri, 28 Oct 2016 11:09:45 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     thierry.reding@...il.com, airlied@...ux.ie, swarren@...dotorg.org,
        gnurou@...il.com, jonathanh@...dia.com, treding@...dia.com
Cc:     dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] drm/tegra: dpaux: Fix error handling

'devm_pinctrl_register()' returns an error pointer or a valid handle. So
checking for NULL here is pointless and can never trigger.

Check the returned value with IS_ERR instead and propagate this value as
done in the other functions which call 'devm_pinctrl_register()'

Fixes: 0751bb5c44fe ("drm/tegra: dpaux: Add pinctrl support")

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/gpu/drm/tegra/dpaux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
index 059f409556d5..2fde44c3a1b3 100644
--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -539,9 +539,9 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
 	dpaux->desc.owner = THIS_MODULE;
 
 	dpaux->pinctrl = devm_pinctrl_register(&pdev->dev, &dpaux->desc, dpaux);
-	if (!dpaux->pinctrl) {
+	if (IS_ERR(dpaux->pinctrl)) {
 		dev_err(&pdev->dev, "failed to register pincontrol\n");
-		return -ENODEV;
+		return PTR_ERR(dpaux->pinctrl);
 	}
 #endif
 	/* enable and clear all interrupts */
-- 
2.9.3