From: Joerg Roedel Date: Thu, 4 Jun 2020 09:19:44 +0000 (+0200) Subject: iommu: Check for deferred attach in iommu_group_do_dma_attach() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=431275afdc7155415254aef4bd3816a1b8a2ead0;p=linux.git iommu: Check for deferred attach in iommu_group_do_dma_attach() The iommu_group_do_dma_attach() must not attach devices which have deferred_attach set. Otherwise devices could cause IOMMU faults when re-initialized in a kdump kernel. Fixes: deac0b3bed26 ("iommu: Split off default domain allocation from group assignment") Reported-by: Jerry Snitselaar Signed-off-by: Joerg Roedel Tested-by: Jerry Snitselaar Reviewed-by: Jerry Snitselaar Link: https://lore.kernel.org/r/20200604091944.26402-1-joro@8bytes.org --- diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index b5ea203f6c683..d43120eb1dc56 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1680,8 +1680,12 @@ static void probe_alloc_default_domain(struct bus_type *bus, static int iommu_group_do_dma_attach(struct device *dev, void *data) { struct iommu_domain *domain = data; + int ret = 0; - return __iommu_attach_device(domain, dev); + if (!iommu_is_attach_deferred(domain, dev)) + ret = __iommu_attach_device(domain, dev); + + return ret; } static int __iommu_group_dma_attach(struct iommu_group *group)