linux-kernel - [PATCH] virtio_pci: Clear stale cpumask when setting irq affinity

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Message-Id: <1433407304-22981-1-git-send-email-jiang.liu@linux.intel.com>
Date:	Thu,  4 Jun 2015 16:41:44 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] virtio_pci: Clear stale cpumask when setting irq affinity

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>
---
 drivers/virtio/virtio_pci_common.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index e894eb278d83..eba1b7ac7294 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -423,6 +423,7 @@ 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);
 		}
-- 
1.7.10.4

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