[PATCH -next] iommu/dma: Fix missing mutex_init() in iommu_get_msi_cookie()

[Yang Yingliang]

cookie_alloc() is called by iommu_get_dma_cookie() and iommu_get_msi_cookie(),
but the mutex is only initialized in iommu_get_dma_cookie(), move mutex_init()
into cookie_alloc() to make sure the mutex will be initialized.

Fixes: ac9a5d522bb8 ("iommu/dma: Fix race condition during iova_domain initialization")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 drivers/iommu/dma-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 1910f4f1612b..e29157380c48 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -294,6 +294,7 @@ static struct iommu_dma_cookie *cookie_alloc(enum iommu_dma_cookie_type type)
 	if (cookie) {
 		INIT_LIST_HEAD(&cookie->msi_page_list);
 		cookie->type = type;
+		mutex_init(&cookie->mutex);
 	}
 	return cookie;
 }
@@ -311,7 +312,6 @@ int iommu_get_dma_cookie(struct iommu_domain *domain)
 	if (!domain->iova_cookie)
 		return -ENOMEM;
 
-	mutex_init(&domain->iova_cookie->mutex);
 	return 0;
 }
 
-- 
2.25.1