diff options
| author | K. Y. Srinivasan <kys@microsoft.com> | 2012-12-01 06:46:55 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 11:39:15 -0800 |
| commit | 5ab05951c586a2ed9e19a3ed8c437346bfabbfb7 (patch) | |
| tree | 6b35e7482fd3c169fb46de98c3751db1e2035cb5 | |
| parent | b0209501dc7586cbfbf6d023f2dd3ce4621aff2c (diff) | |
Drivers: hv: Add a check to deal with spurious interrupts
We establish the handler before we have fully initialized the VMBUS state.
Deal with spurious interrupts.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index e066d418be97..797142c07fa0 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -454,6 +454,12 @@ static irqreturn_t vmbus_isr(int irq, void *dev_id) union hv_synic_event_flags *event; bool handled = false; + page_addr = hv_context.synic_event_page[cpu]; + if (page_addr == NULL) + return IRQ_NONE; + + event = (union hv_synic_event_flags *)page_addr + + VMBUS_MESSAGE_SINT; /* * Check for events before checking for messages. This is the order * in which events and messages are checked in Windows guests on @@ -463,10 +469,6 @@ static irqreturn_t vmbus_isr(int irq, void *dev_id) if ((vmbus_proto_version == VERSION_WS2008) || (vmbus_proto_version == VERSION_WIN7)) { - page_addr = hv_context.synic_event_page[cpu]; - event = (union hv_synic_event_flags *)page_addr + - VMBUS_MESSAGE_SINT; - /* Since we are a child, we only need to check bit 0 */ if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { |