ARM: 6024/1: bcmring: fix missing down on semaphore in dma.c

Added missing down on the memMap->lock semaphore. Also fixed a return
statement so that we always exit with an up (i.e. early exit via return
is not allowed)

Signed-off-by: Leo Hao Chen <leochen@broadcom.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 10 insertions, 3 deletions

diff --git a/arch/arm/mach-bcmring/dma.c b/arch/arm/mach-bcmring/dma.c
index 2ccf670ce1ac..29c0a911df26 100644
--- a/arch/arm/mach-bcmring/dma.c
+++ b/arch/arm/mach-bcmring/dma.c
@@ -2221,11 +2221,15 @@ EXPORT_SYMBOL(dma_map_create_descriptor_ring);
 int dma_unmap(DMA_MemMap_t *memMap,     /* Stores state information about the map */
               int dirtied       /* non-zero if any of the pages were modified */
     ) {
+
+        int rc = 0;
         int regionIdx;
         int segmentIdx;
         DMA_Region_t *region;
         DMA_Segment_t *segment;
 
+        down(&memMap->lock);
+
         for (regionIdx = 0; regionIdx < memMap->numRegionsUsed; regionIdx++) {
                 region = &memMap->region[regionIdx];
 
@@ -2239,7 +2243,8 @@ int dma_unmap(DMA_MemMap_t *memMap,	/* Stores state information about the map */
                                         printk(KERN_ERR
                                                "%s: vmalloc'd pages are not yet supported\n",
                                                __func__);
-                                        return -EINVAL;
+                                        rc = -EINVAL;
+                                        goto out;
                                 }
 
                         case DMA_MEM_TYPE_KMALLOC:
@@ -2276,7 +2281,8 @@ int dma_unmap(DMA_MemMap_t *memMap,	/* Stores state information about the map */
                                         printk(KERN_ERR
                                                "%s: Unsupported memory type: %d\n",
                                                __func__, region->memType);
-                                        return -EINVAL;
+                                        rc = -EINVAL;
+                                        goto out;
                                 }
                         }
 
@@ -2314,9 +2320,10 @@ int dma_unmap(DMA_MemMap_t *memMap,	/* Stores state information about the map */
         memMap->numRegionsUsed = 0;
         memMap->inUse = 0;
 
+out:
         up(&memMap->lock);
 
-        return 0;
+        return rc;
 }
 
 EXPORT_SYMBOL(dma_unmap);