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8139cp: Fix one possible deadloop in cp_rx_poll 

When cp_rx_poll does not get enough packet, it will check the rx
interrupt status again. If so, it will jumpt to rx_status_loop again.
But the goto jump resets the rx variable as zero too.

As a result, it causes one possible deadloop. Assume this case,
rx_status_loop only gets the packet count which is less than budget,
and (cpr16(IntrStatus) & cp_rx_intr_mask) condition is always true.
It causes the deadloop happens and system is blocked.

Signed-off-by: Gao Feng <fgao@ikuai8.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gao Feng 2016-08-25 09:45:39 +08:00 committed by David S. Miller
parent f38ff2ee77
commit b628d611a2
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/realtek/8139cp.c
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@ -467,8 +467,8 @@ static int cp_rx_poll(struct napi_struct *napi, int budget)
unsigned int rx_tail = cp->rx_tail;
int rx;
rx_status_loop:
rx = 0;
rx_status_loop:
cpw16(IntrStatus, cp_rx_intr_mask);
while (rx < budget) {