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rt2x00: handle spurious pci interrupts

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We have documented case of very bad performance issue on rt2800pci
device, because it generate spurious interrupt, what cause irq line
is disabled: https://bugzilla.redhat.com/show_bug.cgi?id=658451

We already address that problem in separate patch by returning
IRQ_HANDLED from interrupt handler. We think similar fix is needed for
other rt2x00 PCI devices, because users report performance problems on
these devices too.

Cc: stable@vger.kernel.org
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stanislaw Gruszka 2011-11-16 13:58:42 +01:00 committed by John W. Linville
parent 4ba7d99978
commit 23085d5796
3 changed files with 3 additions and 3 deletions
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2
drivers/net/wireless/rt2x00/rt2400pci.c
View file

@ -1380,7 +1380,7 @@ static irqreturn_t rt2400pci_interrupt(int irq, void *dev_instance)
rt2x00pci_register_write(rt2x00dev, CSR7, reg);
if (!reg)
return IRQ_NONE;
return IRQ_HANDLED;
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return IRQ_HANDLED;

2
drivers/net/wireless/rt2x00/rt2500pci.c
View file

@ -1512,7 +1512,7 @@ static irqreturn_t rt2500pci_interrupt(int irq, void *dev_instance)
rt2x00pci_register_write(rt2x00dev, CSR7, reg);
if (!reg)
return IRQ_NONE;
return IRQ_HANDLED;
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return IRQ_HANDLED;

2
drivers/net/wireless/rt2x00/rt61pci.c
View file

@ -2337,7 +2337,7 @@ static irqreturn_t rt61pci_interrupt(int irq, void *dev_instance)
rt2x00pci_register_write(rt2x00dev, INT_SOURCE_CSR, reg);
if (!reg && !reg_mcu)
return IRQ_NONE;
return IRQ_HANDLED;
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return IRQ_HANDLED;