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skge napi->poll() locking bug

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According to: Documentation/networking/netdevices.txt:

<cite>
napi->poll:
..........
	Context: softirq
	         will be called with interrupts disabled by netconsole.
</cite>

napi->poll() could be called either with interrupts enabled
(in softirq context) or disabled (by netconsole), so the irq flag
should be preserved.

Inspired by Ingo's resent forcedeth patch :-)

Signed-off-by: Marin Mitov <mitov@issp.bas.bg>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Marin Mitov 2008-03-23 10:20:09 +02:00 committed by Jeff Garzik
parent 9f5e60dd5f
commit 6ef2977d41
1 changed files with 4 additions and 2 deletions
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6
drivers/net/skge.c
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@ -3199,12 +3199,14 @@ static int skge_poll(struct napi_struct *napi, int to_do)
skge_write8(hw, Q_ADDR(rxqaddr[skge->port], Q_CSR), CSR_START);
if (work_done < to_do) {
spin_lock_irq(&hw->hw_lock);
unsigned long flags;
spin_lock_irqsave(&hw->hw_lock, flags);
__netif_rx_complete(dev, napi);
hw->intr_mask |= napimask[skge->port];
skge_write32(hw, B0_IMSK, hw->intr_mask);
skge_read32(hw, B0_IMSK);
spin_unlock_irq(&hw->hw_lock);
spin_unlock_irqrestore(&hw->hw_lock, flags);
}
return work_done;