[TG3]: Fix bug in tg3_rx()
This patch fixes a bug that causes tg3_has_work() to always return 1. rx work is determined by comparing tp->rx_rcb_ptr with the current hw producer index. The hw producer index is modulo the ring size, but tp- >rx_rcb_ptr is a free running counter that goes up beyond the ring size. After the ring wraps around once, tg3_has_work() will always return 1. The fix is to always do modulo arithmetic on tp->rx_rcb_ptr. Signed-off-by: NMichael Chan <mchan@broadcom.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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