[patch] ethernet: micrel: fix some error codes
From: Dan Carpenter <hidden>
Date: 2016-03-16 07:45:25
There were two issues here:
1) dma_mapping_error() return true/false but we want to return -ENOMEM
2) If dmaengine_prep_slave_sg() failed then "err" wasn't set but
presumably that should be -ENOMEM as well.
I changed the success path to "return 0;" instead of "return ret;" for
clarity.
Fixes: 94fe8c683cea ('ks8842: Support DMA when accessed via timberdale')
Signed-off-by: Dan Carpenter <redacted>
diff --git a/drivers/net/ethernet/micrel/ks8842.c b/drivers/net/ethernet/micrel/ks8842.c
index 09d2e16..cb0102d 100644
--- a/drivers/net/ethernet/micrel/ks8842.c
+++ b/drivers/net/ethernet/micrel/ks8842.c@@ -561,8 +561,8 @@ static int __ks8842_start_new_rx_dma(struct net_device *netdev) sg_init_table(sg, 1); sg_dma_address(sg) = dma_map_single(adapter->dev, ctl->skb->data, DMA_BUFFER_SIZE, DMA_FROM_DEVICE); - err = dma_mapping_error(adapter->dev, sg_dma_address(sg)); - if (unlikely(err)) { + if (dma_mapping_error(adapter->dev, sg_dma_address(sg))) { + err = -ENOMEM; sg_dma_address(sg) = 0; goto out; }
@@ -572,8 +572,10 @@ static int __ks8842_start_new_rx_dma(struct net_device *netdev) ctl->adesc = dmaengine_prep_slave_sg(ctl->chan, sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); - if (!ctl->adesc) + if (!ctl->adesc) { + err = -ENOMEM; goto out; + } ctl->adesc->callback_param = netdev; ctl->adesc->callback = ks8842_dma_rx_cb;
@@ -584,7 +586,7 @@ static int __ks8842_start_new_rx_dma(struct net_device *netdev) goto out; } - return err; + return 0; out: if (sg_dma_address(sg)) dma_unmap_single(adapter->dev, sg_dma_address(sg),