diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/s390-iommu.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c index 3833e86c6e7b..c898bcbbce11 100644 --- a/drivers/iommu/s390-iommu.c +++ b/drivers/iommu/s390-iommu.c @@ -99,7 +99,7 @@ static int s390_iommu_attach_device(struct iommu_domain *domain, if (!domain_device) return -ENOMEM; - if (zdev->dma_table) { + if (zdev->dma_table && !zdev->s390_domain) { cc = zpci_dma_exit_device(zdev); if (cc) { rc = -EIO; @@ -107,6 +107,9 @@ static int s390_iommu_attach_device(struct iommu_domain *domain, } } + if (zdev->s390_domain) + zpci_unregister_ioat(zdev, 0); + zdev->dma_table = s390_domain->dma_table; cc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, virt_to_phys(zdev->dma_table)); @@ -136,7 +139,13 @@ static int s390_iommu_attach_device(struct iommu_domain *domain, return 0; out_restore: - zpci_dma_init_device(zdev); + if (!zdev->s390_domain) { + zpci_dma_init_device(zdev); + } else { + zdev->dma_table = zdev->s390_domain->dma_table; + zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, + virt_to_phys(zdev->dma_table)); + } out_free: kfree(domain_device); @@ -167,7 +176,7 @@ static void s390_iommu_detach_device(struct iommu_domain *domain, } spin_unlock_irqrestore(&s390_domain->list_lock, flags); - if (found) { + if (found && (zdev->s390_domain == s390_domain)) { zdev->s390_domain = NULL; zpci_unregister_ioat(zdev, 0); zpci_dma_init_device(zdev); |