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b44: the poll handler b44_poll must not enable IRQ unconditionally 

net/core/netpoll.c::netpoll_send_skb() calls the poll handler when
it is available. As netconsole can be used from almost any context,
IRQ must not be enabled blindly in the NAPI handler of the driver
which supports netpoll.

Call trace:
netpoll_send_skb()
{
local_irq_save(flags)
  -> netpoll_poll()
    -> poll_napi()
      -> poll_one_napi()
        -> napi->poll()
            -> b44_poll()
local_irq_restore(flags)
}

Signed-off-by: Dongdong Deng <dongdong.deng@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dongdong Deng 2009-09-16 16:10:47 +00:00 committed by David S. Miller
parent 3933fc952a
commit e99b1f04d9
1 changed files with 3 additions and 4 deletions
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7
drivers/net/b44.c
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@ -847,23 +847,22 @@ static int b44_poll(struct napi_struct *napi, int budget)
{ {
struct b44 *bp = container_of(napi, struct b44, napi); struct b44 *bp = container_of(napi, struct b44, napi);
int work_done; int work_done;
unsigned long flags;
spin_lock_irq(&bp->lock); spin_lock_irqsave(&bp->lock, flags);
if (bp->istat & (ISTAT_TX | ISTAT_TO)) { if (bp->istat & (ISTAT_TX | ISTAT_TO)) {
/* spin_lock(&bp->tx_lock); */ /* spin_lock(&bp->tx_lock); */
b44_tx(bp); b44_tx(bp);
/* spin_unlock(&bp->tx_lock); */ /* spin_unlock(&bp->tx_lock); */
} }
spin_unlock_irq(&bp->lock); spin_unlock_irqrestore(&bp->lock, flags);
work_done = 0; work_done = 0;
if (bp->istat & ISTAT_RX) if (bp->istat & ISTAT_RX)
work_done += b44_rx(bp, budget); work_done += b44_rx(bp, budget);
if (bp->istat & ISTAT_ERRORS) { if (bp->istat & ISTAT_ERRORS) {
unsigned long flags;
spin_lock_irqsave(&bp->lock, flags); spin_lock_irqsave(&bp->lock, flags);
b44_halt(bp); b44_halt(bp);
b44_init_rings(bp); b44_init_rings(bp);