From: Robin Murphy Date: Mon, 15 Aug 2022 16:20:03 +0000 (+0100) Subject: iommu/amd: Handle race between registration and device probe X-Git-Tag: v6.1-rc5~227^2^8~23 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cbc040081fdf7d73ef60112b24caa785b3f293f3;p=platform%2Fkernel%2Flinux-starfive.git iommu/amd: Handle race between registration and device probe 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 Link: https://lore.kernel.org/r/a8d8ebe12b411d28972f1ab928c6db92e8913cf5.1660572783.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel --- diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 94220eb..85c4122 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;