linux-kernel - [PATCH] drm/msm/dpu: fix error check return value of irq_of_parse_and

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Date:   Mon, 25 Apr 2022 09:09:47 +0000
From:   cgel.zte@...il.com
To:     robdclark@...il.com, sean@...rly.run
Cc:     quic_abhinavk@...cinc.com, airlied@...ux.ie, daniel@...ll.ch,
        dmitry.baryshkov@...aro.org, swboyd@...omium.org,
        bjorn.andersson@...aro.org,
        angelogioacchino.delregno@...ainline.org, tiny.windzz@...il.com,
        architt@...eaurora.org, jsanka@...eaurora.org,
        skolluku@...eaurora.org, ryadav@...eaurora.org,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Lv Ruyi <lv.ruyi@....com.cn>, Zeal Robot <zealci@....com.cn>
Subject: [PATCH] drm/msm/dpu: fix error check return value of irq_of_parse_and_map()

From: Lv Ruyi <lv.ruyi@....com.cn>

The irq_of_parse_and_map() function returns 0 on failure, and does not
return a negative value anyhow, so never enter this conditional branch.

Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support")
Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index e29796c4f27b..36eeeae7fe45 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1187,9 +1187,9 @@ struct msm_kms *dpu_kms_init(struct drm_device *dev)
 	dpu_kms = to_dpu_kms(priv->kms);
 
 	irq = irq_of_parse_and_map(dpu_kms->pdev->dev.of_node, 0);
-	if (irq < 0) {
-		DPU_ERROR("failed to get irq: %d\n", irq);
-		return ERR_PTR(irq);
+	if (!irq) {
+		DPU_ERROR("failed to get irq\n");
+		return ERR_PTR(-EINVAL);
 	}
 	dpu_kms->base.irq = irq;
 
-- 
2.25.1