linux-kernel - [PATCH 3/8] Staging: hv: vmbus: Check for events before messages

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Message-Id: <1313446327-10650-3-git-send-email-kys@microsoft.com>
Date:	Mon, 15 Aug 2011 15:12:02 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: [PATCH 3/8] Staging: hv: vmbus: Check for events before messages

Hyper-V requires that events be processed before processing messages. Make the
necessary code adjustments.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/staging/hv/vmbus_drv.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
index 1d4e878..536466b 100644
--- a/drivers/staging/hv/vmbus_drv.c
+++ b/drivers/staging/hv/vmbus_drv.c
@@ -418,15 +418,6 @@ 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;
-		vmbus_on_msg_dpc(0);
-	}
-
 	page_addr = hv_context.synic_event_page[cpu];
 	event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
 
@@ -436,6 +427,15 @@ 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 process */
+	if (msg->header.message_type != HVMSG_NONE) {
+		handled = true;
+		vmbus_on_msg_dpc(0);
+	}
+
 	if (handled)
 		return IRQ_HANDLED;
 	else
-- 
1.7.4.1

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