Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 5ab05951 authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
Browse files

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: default avatarK. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b0209501

drivers/hv/vmbus_drv.c

+6 −4
Original line number Diff line number Diff line
@@ -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])) {