[PATCH 1/1] smsc9420: fix interrupt signalling test failures
From: Steve Glendinning <hidden>
Date: 2009-01-29 16:39:15
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
smsc9420 performs an interrupt signalling test when the interface is brought up. The current code mistakenly sets its test flag to false AFTER enabling the software interrupt source, making failure quite likely. This patch changes the code to set the test flag BEFORE enabling interrupts. I've also removed an smp_wmb because the following spinlock provides an implicit memory barrier. Signed-off-by: Steve Glendinning <redacted> --- drivers/net/smsc9420.c | 3 +-- 1 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/drivers/net/smsc9420.c b/drivers/net/smsc9420.c
index c14a4c6..d801900 100644
--- a/drivers/net/smsc9420.c
+++ b/drivers/net/smsc9420.c@@ -1378,6 +1378,7 @@ static int smsc9420_open(struct net_device *dev) /* test the IRQ connection to the ISR */ smsc_dbg(IFUP, "Testing ISR using IRQ %d", dev->irq); + pd->software_irq_signal = false; spin_lock_irqsave(&pd->int_lock, flags); /* configure interrupt deassertion timer and enable interrupts */
@@ -1393,8 +1394,6 @@ static int smsc9420_open(struct net_device *dev) smsc9420_pci_flush_write(pd); timeout = 1000; - pd->software_irq_signal = false; - smp_wmb(); while (timeout--) { if (pd->software_irq_signal) break;
--
1.6.0.6