[PATCH] drm/etnaviv: Improve unlocking of a mutex in etnaviv_iommu_map_gem()

[SF Markus Elfring]

From: Markus Elfring <elfr...@users.sourceforge.net>
Date: Mon, 23 Oct 2017 21:27:30 +0200

Add a jump target so that a call of the function "mutex_unlock" is stored
only once at the end of this function implementation.
Replace three calls by goto statements.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfr...@users.sourceforge.net>
---
 drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c 
b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
index f103e787de94..9b0d797349d4 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
@@ -221,18 +221,16 @@ int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
                if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
                        mapping->iova = iova;
                        list_add_tail(&mapping->mmu_node, &mmu->mappings);
-                       mutex_unlock(&mmu->lock);
-                       return 0;
+                       ret = 0;
+                       goto unlock;
                }
        }
 
        node = &mapping->vram_node;
 
        ret = etnaviv_iommu_find_iova(mmu, node, etnaviv_obj->base.size);
-       if (ret < 0) {
-               mutex_unlock(&mmu->lock);
-               return ret;
-       }
+       if (ret < 0)
+               goto unlock;
 
        mmu->last_iova = node->start + etnaviv_obj->base.size;
        mapping->iova = node->start;
@@ -242,13 +240,12 @@ int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
        if (ret < 0) {
                drm_mm_remove_node(node);
-               mutex_unlock(&mmu->lock);
-               return ret;
+               goto unlock;
        }
 
        list_add_tail(&mapping->mmu_node, &mmu->mappings);
        mmu->need_flush = true;
+unlock:
        mutex_unlock(&mmu->lock);
-
        return ret;
 }
 
-- 
2.14.2