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dmaengine: xgene-dma: fix handling xgene_dma_get_ring_size result 

The function can return negative value.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/assign_signed_to_unsigned.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2046107

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Andrzej Hajda 2015-09-24 16:00:17 +02:00 committed by Vinod Koul
parent aebf5a67db
commit c1492b4c54
1 changed files with 6 additions and 3 deletions
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9
drivers/dma/xgene-dma.c
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@ -1421,15 +1421,18 @@ static int xgene_dma_create_ring_one(struct xgene_dma_chan *chan,
struct xgene_dma_ring *ring,
enum xgene_dma_ring_cfgsize cfgsize)
{
int ret;
/* Setup DMA ring descriptor variables */
ring->pdma = chan->pdma;
ring->cfgsize = cfgsize;
ring->num = chan->pdma->ring_num++;
ring->id = XGENE_DMA_RING_ID_GET(ring->owner, ring->buf_num);
ring->size = xgene_dma_get_ring_size(chan, cfgsize);
if (ring->size <= 0)
return ring->size;
ret = xgene_dma_get_ring_size(chan, cfgsize);
if (ret <= 0)
return ret;
ring->size = ret;
/* Allocate memory for DMA ring descriptor */
ring->desc_vaddr = dma_zalloc_coherent(chan->dev, ring->size,