linux-kernel - [PATCH 4.9 008/120] drm/tegra: dpaux: Fix error handling

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Message-Id: <20170118104648.480158403@linuxfoundation.org>
Date:   Wed, 18 Jan 2017 11:45:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Jon Hunter <jonathanh@...dia.com>,
        Thierry Reding <treding@...dia.com>
Subject: [PATCH 4.9 008/120] drm/tegra: dpaux: Fix error handling

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe Jaillet <christophe.jaillet@...adoo.fr>

commit 9376cad2073d2c122864754ea5f80025c8507b0b upstream.

The devm_pinctrl_register() function 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>
Acked-by: Jon Hunter <jonathanh@...dia.com>
Signed-off-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/tegra/dpaux.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -539,9 +539,9 @@ static int tegra_dpaux_probe(struct plat
 	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 */