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Staging: hv: vmbus: Check for events before messages 

The Windows team has informed us that on Windows guests on Hyper-V,
they check for events before messages. They also recommended that we do
the same. This patch addresses this.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-08-31 14:35:56 -07:00 committed by Greg Kroah-Hartman
parent 8b9987e905
commit 7341d908af
1 changed files with 14 additions and 8 deletions
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22
drivers/staging/hv/vmbus_drv.c
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@ -442,14 +442,11 @@ static irqreturn_t vmbus_isr(int irq, void *dev_id)
union hv_synic_event_flags *event;
bool handled = false;
page_addr = hv_context.synic_message_page[cpu];
msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
/* Check if there are actual msgs to be process */
if (msg->header.message_type != HVMSG_NONE) {
handled = true;
tasklet_schedule(&msg_dpc);
}
/*
* Check for events before checking for messages. This is the order
* in which events and messages are checked in Windows guests on
* Hyper-V, and the Windows team suggested we do the same.
*/
page_addr = hv_context.synic_event_page[cpu];
event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
@ -460,6 +457,15 @@ static irqreturn_t vmbus_isr(int irq, void *dev_id)
tasklet_schedule(&event_dpc);
}
page_addr = hv_context.synic_message_page[cpu];
msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
/* Check if there are actual msgs to be processed */
if (msg->header.message_type != HVMSG_NONE) {
handled = true;
tasklet_schedule(&msg_dpc);
}
if (handled)
return IRQ_HANDLED;
else