linux-kernel - [PATCH 3.13.y-ckt 40/56] virtio_pci: Clear stale cpumask when setting irq affinity

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Message-Id: <1436370037-25874-41-git-send-email-kamal@canonical.com>
Date:	Wed,  8 Jul 2015 08:40:21 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Luis Henriques <luis.henriques@...onical.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 40/56] virtio_pci: Clear stale cpumask when setting irq affinity

3.13.11-ckt23 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jiang Liu <jiang.liu@...ux.intel.com>

commit 210d150e1f5da506875e376422ba31ead2d49621 upstream.

The cpumask vp_dev->msix_affinity_masks[info->msix_vector] may contain
staled information when vp_set_vq_affinity() gets called, so clear it
before setting the new cpu bit mask.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
[ luis: backported to 3.16:
  - file rename: virtio_pci_common.c -> virtio_pci.c ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/virtio/virtio_pci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 6b35f925..9aa37a7 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -647,6 +647,7 @@ static int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
 		if (cpu == -1)
 			irq_set_affinity_hint(irq, NULL);
 		else {
+			cpumask_clear(mask);
 			cpumask_set_cpu(cpu, mask);
 			irq_set_affinity_hint(irq, mask);
 		}
-- 
1.9.1

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