staging: android: ion: Avoid calling free_duped_table() twice

Currently, the duplicated sg table is freed in the detach() and
the error path of map_dma_buf() ion's dma_buf_ops.

If a call to dma_buf_map_attachment() fails, the importer is
expected to call dma_buf_detach() to remove the attachment. This
will result in us trying to free the duped sg table twice.

Don't call free_duped_table() in ion_map_dma_buf() to avoid this.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Acked-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index c3e601c..afa7c45 100644 (file)
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -267,20 +267,14 @@ static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
 {
        struct ion_dma_buf_attachment *a = attachment->priv;
        struct sg_table *table;
-       int ret;
 
        table = a->table;
 
        if (!dma_map_sg(attachment->dev, table->sgl, table->nents,
-                       direction)){
-               ret = -ENOMEM;
-               goto err;
-       }
-       return table;
+                       direction))
+               return ERR_PTR(-ENOMEM);
 
-err:
-       free_duped_table(table);
-       return ERR_PTR(ret);
+       return table;
 }
 
 static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,