iommu/msm: Fix error handling in msm_iommu_unmap()

Error handling in msm_iommu_unmap() is broken. On some error
conditions retval is set to a non-zero value which causes
the function to return 'len' at the end. This hides the
error from the user. Zero should be returned in those error
cases.

Cc: David Brown <davidb@codeaurora.org>
Cc: Stepan Moskovchenko <stepanm@codeaurora.org>
Cc: stable@vger.kernel.org # >= 3.1
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Acked-by: David Brown <davidb@codeaurora.org>

1 files changed, 1 insertions, 6 deletions

diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index 08a90b88e40d..cee307e86606 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -482,23 +482,19 @@ static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long va,
 
         priv = domain->priv;
 
-        if (!priv) {
-                ret = -ENODEV;
+        if (!priv)
                 goto fail;
-        }
 
         fl_table = priv->pgtable;
 
         if (len != SZ_16M && len != SZ_1M &&
             len != SZ_64K && len != SZ_4K) {
                 pr_debug("Bad length: %d\n", len);
-                ret = -EINVAL;
                 goto fail;
         }
 
         if (!fl_table) {
                 pr_debug("Null page table\n");
-                ret = -EINVAL;
                 goto fail;
         }
 
@@ -507,7 +503,6 @@ static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long va,
 
         if (*fl_pte == 0) {
                 pr_debug("First level PTE is 0\n");
-                ret = -ENODEV;
                 goto fail;
         }