linux-kernel - [PATCH] drm/msm/dpu: Fix usage of ERR

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Message-ID: <20200528130816.1670-1-yuzenghui@huawei.com>
Date:   Thu, 28 May 2020 21:08:16 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     <robdclark@...il.com>, <sean@...rly.run>, <airlied@...ux.ie>,
        <daniel@...ll.ch>, <jsanka@...eaurora.org>,
        <wanghaibin.wang@...wei.com>, Zenghui Yu <yuzenghui@...wei.com>
Subject: [PATCH] drm/msm/dpu: Fix usage of ERR_PTR()

ERR_PTR() is used in the kernel to encode an usual *negative* errno code
into a pointer.  Passing a positive value (ENOMEM) to it will break the
following IS_ERR() check.

Though memory allocation is unlikely to fail, it's still worth fixing.
And grepping shows that this is the only misuse of ERR_PTR() in kernel.

Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support")
Signed-off-by: Zenghui Yu <yuzenghui@...wei.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index a1b79ee2bd9d..a2f6b688a976 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -2173,7 +2173,7 @@ struct drm_encoder *dpu_encoder_init(struct drm_device *dev,
 
 	dpu_enc = devm_kzalloc(dev->dev, sizeof(*dpu_enc), GFP_KERNEL);
 	if (!dpu_enc)
-		return ERR_PTR(ENOMEM);
+		return ERR_PTR(-ENOMEM);
 
 	rc = drm_encoder_init(dev, &dpu_enc->base, &dpu_encoder_funcs,
 			drm_enc_mode, NULL);
-- 
2.19.1