amd_iommu: fix lock imbalance

In alloc_coherent there is an omitted unlock on the path where mapping
fails. Add the unlock.

[ Impact: fix lock imbalance in alloc_coherent ]

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index d6898833c363..9f89bb645b31 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1541,8 +1541,10 @@ static void *alloc_coherent(struct device *dev, size_t size,
         *dma_addr = __map_single(dev, iommu, domain->priv, paddr,
                                  size, DMA_BIDIRECTIONAL, true, dma_mask);
 
-        if (*dma_addr == bad_dma_address)
+        if (*dma_addr == bad_dma_address) {
+                spin_unlock_irqrestore(&domain->lock, flags);
                 goto out_free;
+        }
 
         iommu_completion_wait(iommu);