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qeth: Fix crash on initial MTU size change

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When the initial MTU size is changed prior to any activity on the device
(e.g. by attaching a z/VM vNIC already configured in Linux to a guestLAN),
we call dev_kfree_skb_irq(NULL) which results in a kernel panic.
Adding a proper check for NULL pointers to address this issue.

Signed-off-by: Stefan Raspl <[email protected]>
Signed-off-by: Frank Blaschka <[email protected]>
Reviewed-by: Ursula Braun <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Stefan Raspl 2013-06-24 13:21:51 +02:00 • committed by David S. Miller
commit ede8867166
1 changed files with 4 additions and 2 deletions
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6
drivers/s390/net/qeth_core_main.c
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@ -1282,8 +1282,10 @@ static void qeth_free_qdio_buffers(struct qeth_card *card)
qeth_free_cq(card);
cancel_delayed_work_sync(&card->buffer_reclaim_work);
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j)
dev_kfree_skb_any(card->qdio.in_q->bufs[j].rx_skb);
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) {
if (card->qdio.in_q->bufs[j].rx_skb)
dev_kfree_skb_any(card->qdio.in_q->bufs[j].rx_skb);
}
kfree(card->qdio.in_q);
card->qdio.in_q = NULL;
/* inbound buffer pool */