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authorK. Y. Srinivasan <kys@microsoft.com>2012-12-01 06:46:55 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-17 11:39:15 -0800
commit5ab05951c586a2ed9e19a3ed8c437346bfabbfb7 (patch)
tree6b35e7482fd3c169fb46de98c3751db1e2035cb5 /drivers/hv
parentb0209501dc7586cbfbf6d023f2dd3ce4621aff2c (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>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/vmbus_drv.c10
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])) {

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