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bmips: check for DMA error when refilling Rx

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dma_mapping_error() should be called as dma_map_single() could fail and
return error.

Signed-off-by: Sieng-Piaw Liew <liew.s.piaw@gmail.com>
This commit is contained in:
Sieng-Piaw Liew
2022-07-19 08:20:45 +08:00
committed by Álvaro Fernández Rojas
parent a6a54135ef
commit 65ebe31130
1 changed files with 20 additions and 8 deletions
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28
target/linux/bmips/files/drivers/net/ethernet/broadcom/bcm6368-enetsw.c
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@@ -270,6 +270,7 @@ static int bcm6368_enetsw_refill_rx(struct net_device *dev, bool napi_mode)
if (!priv->rx_buf[desc_idx]) {
unsigned char *buf;
dma_addr_t p;
if (likely(napi_mode))
buf = napi_alloc_frag(priv->rx_frag_size);
@@ -279,11 +280,15 @@ static int bcm6368_enetsw_refill_rx(struct net_device *dev, bool napi_mode)
if (unlikely(!buf))
break;
p = dma_map_single(&priv->pdev->dev, buf + NET_SKB_PAD,
priv->rx_buf_size, DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(&priv->pdev->dev, p))) {
skb_free_frag(buf);
break;
}
priv->rx_buf[desc_idx] = buf;
desc->address = dma_map_single(&priv->pdev->dev,
buf + NET_SKB_PAD,
priv->rx_buf_size,
DMA_FROM_DEVICE);
desc->address = p;
}
len_stat = priv->rx_buf_size << DMADESC_LENGTH_SHIFT;
@@ -563,6 +568,7 @@ bcm6368_enetsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
struct bcm6368_enetsw_desc *desc;
u32 len_stat;
netdev_tx_t ret;
dma_addr_t p;
/* lock against tx reclaim */
spin_lock(&priv->tx_lock);
@@ -597,13 +603,19 @@ bcm6368_enetsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
data = skb_put_zero(skb, needed);
}
/* fill descriptor */
p = dma_map_single(&priv->pdev->dev, skb->data, skb->len,
DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(&priv->pdev->dev, p))) {
dev_kfree_skb(skb);
ret = NETDEV_TX_OK;
goto out_unlock;
}
/* point to the next available desc */
desc = &priv->tx_desc_cpu[priv->tx_curr_desc];
priv->tx_skb[priv->tx_curr_desc] = skb;
/* fill descriptor */
desc->address = dma_map_single(&priv->pdev->dev, skb->data, skb->len,
DMA_TO_DEVICE);
desc->address = p;
len_stat = (skb->len << DMADESC_LENGTH_SHIFT) & DMADESC_LENGTH_MASK;
len_stat |= DMADESC_ESOP_MASK | DMADESC_APPEND_CRC |