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From: "Michael S. Tsirkin" <mst@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Eric Van Hensbergen <ericvh@gmail.com>,
	Ron Minnich <rminnich@sandia.gov>,
	Latchesar Ionkov <lucho@ionkov.net>,
	"David S. Miller" <davem@davemloft.net>,
	v9fs-developer@lists.sourceforge.net, netdev@vger.kernel.org
Subject: [PATCH 15/16] 9p/trans_virtio: enable VQs early
Date: Sun, 5 Oct 2014 19:07:33 +0300	[thread overview]
Message-ID: <1412525038-15871-16-git-send-email-mst@redhat.com> (raw)
In-Reply-To: <1412525038-15871-1-git-send-email-mst@redhat.com>

virtio spec requires drivers to set DRIVER_OK before using VQs.
This is set automatically after probe returns, but virtio 9p device
adds self to channel list within probe, at which point VQ can be
used in violation of the spec.

To fix, call virtio_early_enable_vqs before using VQs.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 net/9p/trans_virtio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 6940d8f..0e8bbb3 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -575,6 +575,8 @@ static int p9_virtio_probe(struct virtio_device *vdev)
 	/* Ceiling limit to avoid denial of service attacks */
 	chan->p9_max_pages = nr_free_buffer_pages()/4;
 
+	virtio_early_enable_vqs(vdev);
+
 	mutex_lock(&virtio_9p_lock);
 	list_add_tail(&chan->chan_list, &virtio_chan_list);
 	mutex_unlock(&virtio_9p_lock);
-- 
MST


  parent reply	other threads:[~2014-10-05 16:04 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-05 16:06 [PATCH 00/16] virtio: fix spec compliance issues Michael S. Tsirkin
2014-10-05 16:06 ` [PATCH 01/16] virtio_pci: fix virtio spec compliance on restore Michael S. Tsirkin
2014-10-05 16:06 ` [PATCH 02/16] virtio: unify config_changed handling Michael S. Tsirkin
2014-10-06  9:20   ` Cornelia Huck
2014-10-05 16:06 ` [PATCH 03/16] virtio: refactor to use drv_to_virtio Michael S. Tsirkin
2014-10-06 10:34   ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 04/16] virtio-pci: move freeze/restore to virtio core Michael S. Tsirkin
2014-10-06 10:54   ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 05/16] virtio: defer config changed notifications Michael S. Tsirkin
2014-10-06 11:33   ` Cornelia Huck
2014-10-06 12:00     ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 06/16] virtio_blk: drop config_enable Michael S. Tsirkin
2014-10-06 11:42   ` Cornelia Huck
2014-10-06 12:09     ` Michael S. Tsirkin
2014-10-06 12:20       ` Cornelia Huck
2014-10-06 12:31         ` Michael S. Tsirkin
2014-10-06 12:55           ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 07/16] virtio-blk: drop config_mutex Michael S. Tsirkin
2014-10-06 11:48   ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 08/16] virtio_net: drop config_enable Michael S. Tsirkin
2014-10-06 11:50   ` Cornelia Huck
2014-10-06 12:10     ` Michael S. Tsirkin
2014-10-06 19:02   ` David Miller
2014-10-07  6:49     ` Michael S. Tsirkin
2014-10-07 15:36       ` David Miller
2014-10-07 15:42         ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 09/16] virtio-net: drop config_mutex Michael S. Tsirkin
2014-10-06 11:46   ` Sergei Shtylyov
2014-10-06 11:56     ` Michael S. Tsirkin
2014-10-06 12:07       ` Sergei Shtylyov
2014-10-06 12:22         ` Michael S. Tsirkin
2014-10-06 12:31           ` Sergei Shtylyov
2014-10-06 11:56   ` Cornelia Huck
2014-10-06 12:01     ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 10/16] virtio: add API to enable VQs early Michael S. Tsirkin
2014-10-06 14:08   ` Cornelia Huck
2014-10-06 14:51     ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 11/16] virtio_net: minor cleanup Michael S. Tsirkin
2014-10-06 12:06   ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 12/16] virtio_net: enable VQs early Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 13/16] virtio_blk: " Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 14/16] virtio_console: " Michael S. Tsirkin
2014-10-05 16:07 ` Michael S. Tsirkin [this message]
2014-10-05 16:07 ` [PATCH 16/16] virtio_net: fix use after free on allocation failure Michael S. Tsirkin
2014-10-06 14:17   ` Cornelia Huck

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