iommu/fsl: Fix the device domain attach condition.

Store the domain information for the device, only if it's not already
attached to a domain.

Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 2 insertions, 7 deletions

diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 3dd0b8edd429..54060d16dec8 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -335,11 +335,6 @@ static struct fsl_dma_domain *iommu_alloc_dma_domain(void)
         return domain;
 }
 
-static inline struct device_domain_info *find_domain(struct device *dev)
-{
-        return dev->archdata.iommu_domain;
-}
-
 static void remove_device_ref(struct device_domain_info *info, u32 win_cnt)
 {
         unsigned long flags;
@@ -380,7 +375,7 @@ static void attach_device(struct fsl_dma_domain *dma_domain, int liodn, struct d
          * Check here if the device is already attached to domain or not.
          * If the device is already attached to a domain detach it.
          */
-        old_domain_info = find_domain(dev);
+        old_domain_info = dev->archdata.iommu_domain;
         if (old_domain_info && old_domain_info->domain != dma_domain) {
                 spin_unlock_irqrestore(&device_domain_lock, flags);
                 detach_device(dev, old_domain_info->domain);
@@ -399,7 +394,7 @@ static void attach_device(struct fsl_dma_domain *dma_domain, int liodn, struct d
          * the info for the first LIODN as all
          * LIODNs share the same domain
          */
-        if (!old_domain_info)
+        if (!dev->archdata.iommu_domain)
                 dev->archdata.iommu_domain = info;
         spin_unlock_irqrestore(&device_domain_lock, flags);