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sfc: Survive ISR0=0 bug in the shared IRQ case 

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guido Barzini 2010-02-03 09:31:24 +00:00 committed by David S. Miller
parent 2e80340740
commit c91f48d61c
1 changed files with 9 additions and 0 deletions
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9
drivers/net/sfc/nic.c
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@ -1384,6 +1384,15 @@ static irqreturn_t efx_legacy_interrupt(int irq, void *dev_id)
efx->last_irq_cpu = raw_smp_processor_id();
EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n",
irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg));
} else if (EFX_WORKAROUND_15783(efx)) {
/* We can't return IRQ_HANDLED more than once on seeing ISR0=0
* because this might be a shared interrupt, but we do need to
* check the channel every time and preemptively rearm it if
* it's idle. */
efx_for_each_channel(channel, efx) {
if (!channel->work_pending)
efx_nic_eventq_read_ack(channel);
}
}
return result;