[PATCH v4 02/16] iommu/amd: Handle race between registration and device probe
From: Robin Murphy <robin.murphy@arm.com>
Date: 2022-08-15 16:20:37
Also in:
linux-iommu, lkml
Subsystem:
amd iommu (amd-vi), iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
As for the Intel driver, make sure the AMD driver can cope with seeing .probe_device calls without having to wait for all known instances to register first. Signed-off-by: Robin Murphy <robin.murphy@arm.com> --- v4: No change drivers/iommu/amd/iommu.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 65b8e4fd8217..5ed9fd40d2a7 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c@@ -1851,6 +1851,10 @@ static struct iommu_device *amd_iommu_probe_device(struct device *dev) if (!iommu) return ERR_PTR(-ENODEV); + /* Not registered yet? */ + if (!iommu->iommu.ops) + return ERR_PTR(-ENODEV); + if (dev_iommu_priv_get(dev)) return &iommu->iommu;
--
2.36.1.dirty
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