netdev - [net-next-2.6 PATCH] igb: Use irq_synchronize per vector when using MSI-X

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Date:	Mon, 02 Aug 2010 17:40:52 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, gospo@...hat.com, bphilips@...ell.com,
	Jean Delvare <jdelvare@...e.de>,
	Emil Tantilov <emil.s.tantilov@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next-2.6 PATCH] igb: Use irq_synchronize per vector when using
	MSI-X

From: Emil Tantilov <emil.s.tantilov@...el.com>

Synchronize all IRQs when using MSI-X. Similar to ixgbe.
Issue was reported on e1000e, but the patch is also valid for igb.

CC: Jean Delvare <jdelvare@...e.de>
Signed-off-by: Emil Tantilov <emil.s.tantilov@...el.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 drivers/net/igb/igb_main.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 667b527..df5dcd2 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -1290,7 +1290,13 @@ static void igb_irq_disable(struct igb_adapter *adapter)
 	wr32(E1000_IAM, 0);
 	wr32(E1000_IMC, ~0);
 	wrfl();
-	synchronize_irq(adapter->pdev->irq);
+	if (adapter->msix_entries) {
+		int i;
+		for (i = 0; i < adapter->num_q_vectors; i++)
+			synchronize_irq(adapter->msix_entries[i].vector);
+	} else {
+		synchronize_irq(adapter->pdev->irq);
+	}
 }
 
 /**

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