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authorPaolo Bonzini <pbonzini@redhat.com>2012-06-13 16:56:31 +0200
committerJames Bottomley <JBottomley@Parallels.com>2012-07-20 08:58:57 +0100
commitb5ee8f2802c559fccb177c0a117f5cd56c1049cc (patch)
tree6070c23dd5e23bc02bae19b3d74c8ad88d739cdb
parenta752359f2b0a291c5f229e883842e4b30c698387 (diff)
downloadop-kernel-dev-b5ee8f2802c559fccb177c0a117f5cd56c1049cc.zip
op-kernel-dev-b5ee8f2802c559fccb177c0a117f5cd56c1049cc.tar.gz
[SCSI] virtio-scsi: unlock during kick
Separate virtqueue_kick_prepare from virtqueue_notify, so that the expensive vmexit is done without holding the lock. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
-rw-r--r--drivers/scsi/virtio_scsi.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 1b38431..b0ad5aa 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -264,9 +264,11 @@ static int virtscsi_kick_cmd(struct virtio_scsi *vscsi, struct virtqueue *vq,
ret = virtqueue_add_buf(vq, vscsi->sg, out_num, in_num, cmd, gfp);
if (ret >= 0)
- virtqueue_kick(vq);
+ ret = virtqueue_kick_prepare(vq);
spin_unlock_irqrestore(&vscsi->vq_lock, flags);
+ if (ret > 0)
+ virtqueue_notify(vq);
return ret;
}
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