From c91f48d61c5b6fb36a6fc50de923db4db009b0dc Mon Sep 17 00:00:00 2001 From: Guido Barzini Date: Wed, 3 Feb 2010 09:31:24 +0000 Subject: [PATCH] sfc: Survive ISR0=0 bug in the shared IRQ case Signed-off-by: Ben Hutchings Signed-off-by: David S. Miller --- drivers/net/sfc/nic.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/net/sfc/nic.c b/drivers/net/sfc/nic.c index db44224..8d9696a 100644 --- a/drivers/net/sfc/nic.c +++ b/drivers/net/sfc/nic.c @@ -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; -- 1.8.2.3