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vmxnet3: fix lock imbalance in vmxnet3_tq_xmit()

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A recent bug fix rearranged the code in vmxnet3_tq_xmit() in a
way that left the error handling for oversized headers unlock
a lock that had not been taken yet. Gcc warns about the incorrect
use of the 'flags' variable because of that:

drivers/net/vmxnet3/vmxnet3_drv.c: In function 'vmxnet3_tq_xmit.constprop':
include/linux/spinlock.h:246:3: error: 'flags' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This changes the error handling path to 'goto' the end of the function
beyond the lock/unlock pair.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: cec05562fb ("vmxnet3: avoid calling pskb_may_pull with interrupts disabled")
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2016-03-14 15:53:57 +01:00 committed by David S. Miller
parent 888506a967
commit efc21d9506
1 changed files with 4 additions and 4 deletions
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8
drivers/net/vmxnet3/vmxnet3_drv.c
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@ -1022,14 +1022,16 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
if (ctx.mss) {
if (unlikely(ctx.eth_ip_hdr_size + ctx.l4_hdr_size >
VMXNET3_MAX_TX_BUF_SIZE)) {
goto hdr_too_big;
tq->stats.drop_oversized_hdr++;
goto drop_pkt;
}
} else {
if (skb->ip_summed == CHECKSUM_PARTIAL) {
if (unlikely(ctx.eth_ip_hdr_size +
skb->csum_offset >
VMXNET3_MAX_CSUM_OFFSET)) {
goto hdr_too_big;
tq->stats.drop_oversized_hdr++;
goto drop_pkt;
}
}
}
@ -1123,8 +1125,6 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
return NETDEV_TX_OK;
hdr_too_big:
tq->stats.drop_oversized_hdr++;
unlock_drop_pkt:
spin_unlock_irqrestore(&tq->tx_lock, flags);
drop_pkt: