[PATCH 5.16 0406/1017] drm/v3d/v3d_drv: Check for error num after setting mask

Greg Kroah-Hartman
2022-04-05T09:24:16Z

From: Jiasheng Jiang <jiasheng@iscas.ac.cn>

[ Upstream commit 4a39156166b90465da0f9a33b3442d63b5651bec ]

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.
Also, we can create a variable for the mask to solve the
alignment issue.

Fixes: 334dd38a3878 ("drm/v3d: Set dma_mask as well as coherent_dma_mask")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220110013807.4105270-1-jiasheng@iscas.ac.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/v3d/v3d_drv.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index bd46396a1ae0..1afcd54fbbd5 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -219,6 +219,7 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
int ret;
u32 mmu_debug;
u32 ident1;
+ u64 mask;

v3d = devm_drm_dev_alloc(dev, &v3d_drm_driver, struct v3d_dev, drm);
if (IS_ERR(v3d))
@@ -237,8 +238,11 @@ 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,
- DMA_BIT_MASK(30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_PA_WIDTH)));
+ mask = DMA_BIT_MASK(30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_PA_WIDTH));
+ ret = dma_set_mask_and_coherent(dev, mask);
+ if (ret)
+ return ret;
+
v3d->va_width = 30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_VA_WIDTH);

ident1 = V3D_READ(V3D_HUB_IDENT1);
--
2.34.1