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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>
This commit is contained in:
Ira Snyder 2009-05-15 09:59:46 -07:00 committed by Li Yang
parent 776c8943f2
commit 2e077f8e83
1 changed files with 15 additions and 3 deletions
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18
drivers/dma/fsldma.c
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@ -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;
}
/**