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authorGuido Barzini <gbarzini@solarflare.com>2010-02-03 09:31:24 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-03 19:12:45 -0800
commitc91f48d61c5b6fb36a6fc50de923db4db009b0dc (patch)
tree204514756abc60e91df45caf10203eba6d2d6f6b /drivers/net
parent2e803407400efe592e5294993a5b1e8251f6dd49 (diff)
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>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/sfc/nic.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/sfc/nic.c b/drivers/net/sfc/nic.c
index db44224ed2c..8d9696a38ed 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;