3.2.43-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Joerg Roedel <joro@xxxxxxxxxx>
commit c2a2876e863356b092967ea62bebdb4dd663af80 upstream.
There is a bug introduced with commit 27c2127 that causes
devices which are hot unplugged and then hot-replugged to
not have per-device dma_ops set. This causes these devices
to not function correctly. Fixed with this patch.
Reported-by: Andreas Degert <andreas.degert@xxxxxxxxxxxxxx>
Signed-off-by: Joerg Roedel <joro@xxxxxxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1874,16 +1874,16 @@ static int device_change_notifier(struct
/* allocate a protection domain if a device is added */
dma_domain = find_protection_domain(devid);
- if (dma_domain)
- goto out;
- dma_domain = dma_ops_domain_alloc();
- if (!dma_domain)
- goto out;
- dma_domain->target_dev = devid;
+ if (!dma_domain) {
+ dma_domain = dma_ops_domain_alloc();
+ if (!dma_domain)
+ goto out;
+ dma_domain->target_dev = devid;
- spin_lock_irqsave(&iommu_pd_list_lock, flags);
- list_add_tail(&dma_domain->list, &iommu_pd_list);
- spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
+ spin_lock_irqsave(&iommu_pd_list_lock, flags);
+ list_add_tail(&dma_domain->list, &iommu_pd_list);
+ spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
+ }
dev->archdata.dma_ops = &amd_iommu_dma_ops;
--
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