net: systemport: check harder for out of memory conditions

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There is a potential case where we might be failing to refill a
control block, leaving it with both a NULL skb pointer *and* a NULL
dma_unmap_addr.

The way we process incoming packets, by first calling
dma_unmap_single(), and then only checking for a potential NULL skb can
lead to situations where do pass a NULL dma_unmap_addr() to
dma_unmap_single(), resulting in an oops.

Fix this my moving the NULL skb check earlier, since no backing skb
also means no corresponding DMA mapping for this packet.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Florian Fainelli 2014-09-08 11:37:51 -07:00 • committed by David S. Miller

parent 278d436a47

commit fe24ba082b

1 changed files with 19 additions and 12 deletions

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31

drivers/net/ethernet/broadcom/bcmsysport.c

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