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net: xgene: Check negative return value of xgene_enet_get_ring_size()

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xgene_enet_get_ring_size() returns a negative value in case of an error,
but its only caller in xgene_enet_create_desc_ring() currently uses the
return value directly as u32. Instead, check for a negative value first and
error out in case. Also move the call to xgene_enet_get_ring_size() before
devm_kzalloc() so we don't need to free anything in the error path.

This fixes the following issue reported by the Coverity Scanner:

** CID 1231336:  Improper use of negative value  (NEGATIVE_RETURNS)
/drivers/net/ethernet/apm/xgene/xgene_enet_main.c: 596 in xgene_enet_create_desc_ring()

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tobias Klauser 2014-08-14 13:59:42 +02:00 committed by David S. Miller
parent 9d186cac7f
commit 9b9ba821b6
1 changed files with 5 additions and 2 deletions
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7
drivers/net/ethernet/apm/xgene/xgene_enet_main.c
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@ -581,7 +581,11 @@ static struct xgene_enet_desc_ring *xgene_enet_create_desc_ring(
struct xgene_enet_desc_ring *ring;
struct xgene_enet_pdata *pdata = netdev_priv(ndev);
struct device *dev = ndev_to_dev(ndev);
u32 size;
int size;
size = xgene_enet_get_ring_size(dev, cfgsize);
if (size < 0)
return NULL;
ring = devm_kzalloc(dev, sizeof(struct xgene_enet_desc_ring),
GFP_KERNEL);
@ -593,7 +597,6 @@ static struct xgene_enet_desc_ring *xgene_enet_create_desc_ring(
ring->cfgsize = cfgsize;
ring->id = ring_id;
size = xgene_enet_get_ring_size(dev, cfgsize);
ring->desc_addr = dma_zalloc_coherent(dev, size, &ring->dma,
GFP_KERNEL);
if (!ring->desc_addr) {