From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Date: Thu, 6 Jan 2022 10:43:02 +0800
Subject: iommu/ipmmu-vmsa: Check for error num after setting mask
Git-commit: 1fdbbfd5099f797a4dac05e7ef0192ba4a9c39b4
Patch-mainline: v5.18-rc1
References: git-fixes
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: 1c894225bf5b ("iommu/ipmmu-vmsa: IPMMU device is 40-bit bus master")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Link: https://lore.kernel.org/r/20220106024302.2574180-1-jiasheng@iscas.ac.cn
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/ipmmu-vmsa.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -982,7 +982,9 @@ static int ipmmu_probe(struct platform_d
bitmap_zero(mmu->ctx, IPMMU_CTX_MAX);
mmu->features = of_device_get_match_data(&pdev->dev);
memset(mmu->utlb_ctx, IPMMU_CTX_INVALID, mmu->features->num_utlbs);
- dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40));
+ ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40));
+ if (ret)
+ return ret;
/* Map I/O memory and request IRQ. */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);