mtd: omap2: fix resource leak in prefetch-busy path

If prefetch engine is busy, current code "forgets" to call
dma_unmap_single(), which results in a deadlock later, so add it.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index c2b0bba9d8b3..ab56069fa31f 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -402,7 +402,7 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
                         PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write);
         if (ret)
                 /* PFPW engine is busy, use cpu copy method */
-                goto out_copy;
+                goto out_copy_unmap;
 
         init_completion(&info->comp);
 
@@ -421,6 +421,8 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
         dma_unmap_single(&info->pdev->dev, dma_addr, len, dir);
         return 0;
 
+out_copy_unmap:
+        dma_unmap_single(&info->pdev->dev, dma_addr, len, dir);
 out_copy:
         if (info->nand.options & NAND_BUSWIDTH_16)
                 is_write == 0 ? omap_read_buf16(mtd, (u_char *) addr, len)