linux-kernel - [PATCH] drm/v3d/v3d_drv: Check for error num after setting mask

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Message-Id: <20220106025539.2597562-1-jiasheng@iscas.ac.cn>
Date:   Thu,  6 Jan 2022 10:55:39 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     emma@...olt.net, airlied@...ux.ie, daniel@...ll.ch,
        p.zabel@...gutronix.de
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] drm/v3d/v3d_drv: Check for error num after setting mask

Because of the possible failure of the dma_supported(), the
dma_set_mask_and_coherent() may return error num.
Therefore, it should be better to check it and return the error if
fails.

Fixes: 334dd38a3878 ("drm/v3d: Set dma_mask as well as coherent_dma_mask")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/gpu/drm/v3d/v3d_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index 99e22beea90b..bedd52195723 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -232,8 +232,11 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 		return ret;
 
 	mmu_debug = V3D_READ(V3D_MMU_DEBUG_INFO);
-	dma_set_mask_and_coherent(dev,
+	ret = dma_set_mask_and_coherent(dev,
 		DMA_BIT_MASK(30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_PA_WIDTH)));
+	if (ret)
+		return ret;
+
 	v3d->va_width = 30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_VA_WIDTH);
 
 	ident1 = V3D_READ(V3D_HUB_IDENT1);
-- 
2.25.1