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Date: Thu, 22 Sep 2022 01:53:52 -0700 From: Nicolin Chen <nicolinc@...dia.com> To: <joro@...tes.org>, <will@...nel.org>, <robin.murphy@....com> CC: <jgg@...dia.com>, <kevin.tian@...el.com>, <suravee.suthikulpanit@....com>, <iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org> Subject: [PATCH v5 2/6] iommu/amd: Drop unnecessary checks in amd_iommu_attach_device() The same checks are done in amd_iommu_probe_device(). If any of them fails there, then the device won't get a group, so there's no way for it to even reach amd_iommu_attach_device anymore. Suggested-by: Robin Murphy <robin.murphy@....com> Cc: Joerg Roedel <joro@...tes.org> Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com> Reviewed-by: Vasant Hegde <vasant.hegde@....com> Signed-off-by: Nicolin Chen <nicolinc@...dia.com> --- drivers/iommu/amd/iommu.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 828672a46a3d..930d9946b9f7 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -2135,21 +2135,13 @@ static void amd_iommu_detach_device(struct iommu_domain *dom, static int amd_iommu_attach_device(struct iommu_domain *dom, struct device *dev) { + struct iommu_dev_data *dev_data = dev_iommu_priv_get(dev); struct protection_domain *domain = to_pdomain(dom); - struct iommu_dev_data *dev_data; - struct amd_iommu *iommu; + struct amd_iommu *iommu = rlookup_amd_iommu(dev); int ret; - if (!check_device(dev)) - return -EINVAL; - - dev_data = dev_iommu_priv_get(dev); dev_data->defer_attach = false; - iommu = rlookup_amd_iommu(dev); - if (!iommu) - return -EINVAL; - if (dev_data->domain) detach_device(dev); -- 2.17.1
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