fsldma: fix memory leak on error path in fsl_dma_prep_memcpy()

When preparing a memcpy operation, if the kernel fails to allocate memory
for a link descriptor after the first link descriptor has already been
allocated, then some memory will never be released. Fix the problem by
walking the list of allocated descriptors backwards, and freeing the
allocated descriptors back into the DMA pool.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Li Yang <leoli@freescale.com>

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index ff9194d7ebb7a8d74e3c2babc8c530ea4ae7f0a3..15783102bf1702c44dd5f95cd7e6b34a774fb0a6 100644 (file)
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -462,8 +462,8 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy(
 {
        struct fsl_dma_chan *fsl_chan;
        struct fsl_desc_sw *first = NULL, *prev = NULL, *new;
+       struct list_head *list;
        size_t copy;
-       LIST_HEAD(link_chain);
 
        if (!chan)
                return NULL;
@@ -480,7 +480,7 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy(
                if (!new) {
                        dev_err(fsl_chan->dev,
                                        "No free memory for link descriptor\n");
-                       return NULL;
+                       goto fail;
                }
 #ifdef FSL_DMA_LD_DEBUG
                dev_dbg(fsl_chan->dev, "new link desc alloc %p\n", new);
@@ -515,7 +515,19 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy(
        /* Set End-of-link to the last link descriptor of new list*/
        set_ld_eol(fsl_chan, new);
 
-       return first ? &first->async_tx : NULL;
+       return &first->async_tx;
+
+fail:
+       if (!first)
+               return NULL;
+
+       list = &first->async_tx.tx_list;
+       list_for_each_entry_safe_reverse(new, prev, list, node) {
+               list_del(&new->node);
+               dma_pool_free(fsl_chan->desc_pool, new, new->async_tx.phys);
+       }
+
+       return NULL;
 }
 
 /**