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ftgmac100: return error in ftgmac100_alloc_rx_buf

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The error paths set err, but it's not returned.

I wondered if we should fix all of the callers to check the returned
value, but Ben explains why the code is this way:

> Most call sites ignore it on purpose. There's nothing we can do if
> we fail to get a buffer at interrupt time, so we point the buffer to
> the scratch page so the HW doesn't DMA into lalaland and lose the
> packet.
>
> The one call site that tests and can fail is the one used when brining
> the interface up. If we fail to allocate at that point, we fail the
> ifup. But as you noticed, I do have a bug not returning the error.

Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joel Stanley 2017-07-25 10:19:01 +09:30 committed by David S. Miller
parent afce615aaa
commit 6cee9d649c
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/faraday/ftgmac100.c
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@ -392,7 +392,7 @@ static int ftgmac100_alloc_rx_buf(struct ftgmac100 *priv, unsigned int entry,
struct net_device *netdev = priv->netdev;
struct sk_buff *skb;
dma_addr_t map;
int err;
int err = 0;
skb = netdev_alloc_skb_ip_align(netdev, RX_BUF_SIZE);
if (unlikely(!skb)) {
@ -428,7 +428,7 @@ static int ftgmac100_alloc_rx_buf(struct ftgmac100 *priv, unsigned int entry,
else
rxdes->rxdes0 = 0;
return 0;
return err;
}
static unsigned int ftgmac100_next_rx_pointer(struct ftgmac100 *priv,