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>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index 0189dcd36f31..e046943ef29d 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -847,23 +847,22 @@ static int b44_poll(struct napi_struct *napi, int budget)
 {
         struct b44 *bp = container_of(napi, struct b44, napi);
         int work_done;
+        unsigned long flags;
 
-        spin_lock_irq(&bp->lock);
+        spin_lock_irqsave(&bp->lock, flags);
 
         if (bp->istat & (ISTAT_TX | ISTAT_TO)) {
                 /* spin_lock(&bp->tx_lock); */
                 b44_tx(bp);
                 /* spin_unlock(&bp->tx_lock); */
         }
-        spin_unlock_irq(&bp->lock);
+        spin_unlock_irqrestore(&bp->lock, flags);
 
         work_done = 0;
         if (bp->istat & ISTAT_RX)
                 work_done += b44_rx(bp, budget);
 
         if (bp->istat & ISTAT_ERRORS) {
-                unsigned long flags;
-
                 spin_lock_irqsave(&bp->lock, flags);
                 b44_halt(bp);
                 b44_init_rings(bp);