From: Jiasheng Jiang 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 Reviewed-by: Nikita Yushchenko Link: https://lore.kernel.org/r/20220106024302.2574180-1-jiasheng@iscas.ac.cn Signed-off-by: Joerg Roedel --- 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);