diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-08 13:55:23 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-02-09 15:37:52 +0000 |
| commit | 22f0bf96de1506081a8b18ad3e0d04d5add70a4a (patch) | |
| tree | a134b18946ff85a076bb7420945231ebeed62952 | |
| parent | 15877e9c8a12ced38ac31d8bf4f93f3634fbea3f (diff) | |
NET: sa11x0-ir: handle DMA mapping errors properly
Handle DMA mapping errors in the rx skb allocation and tx paths.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | drivers/net/irda/sa1100_ir.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/net/irda/sa1100_ir.c b/drivers/net/irda/sa1100_ir.c index 751f2a9f283b..84fecce078f6 100644 --- a/drivers/net/irda/sa1100_ir.c +++ b/drivers/net/irda/sa1100_ir.c @@ -82,7 +82,6 @@ static int sa1100_irda_rx_alloc(struct sa1100_irda *si) return 0; si->rxskb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC); - if (!si->rxskb) { printk(KERN_ERR "sa1100_ir: out of memory for RX SKB\n"); return -ENOMEM; @@ -97,6 +96,11 @@ static int sa1100_irda_rx_alloc(struct sa1100_irda *si) si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data, HPSIR_MAX_RXLEN, DMA_FROM_DEVICE); + if (dma_mapping_error(si->dev, si->rxbuf_dma)) { + dev_kfree_skb_any(si->rxskb); + return -ENOMEM; + } + return 0; } @@ -518,7 +522,8 @@ static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev netif_rx(skb); } else { /* - * Remap the buffer. + * Remap the buffer - it was previously mapped, and we + * hope that this succeeds. */ si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data, HPSIR_MAX_RXLEN, @@ -701,6 +706,13 @@ static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev) si->txskb = skb; si->txbuf_dma = dma_map_single(si->dev, skb->data, skb->len, DMA_TO_DEVICE); + if (dma_mapping_error(si->dev, si->txbuf_dma)) { + si->txskb = NULL; + netif_wake_queue(dev); + dev->stats.tx_dropped++; + dev_kfree_skb(skb); + return NETDEV_TX_OK; + } sa1100_start_dma(si->txdma, si->txbuf_dma, skb->len); |