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| author | Rusty Russell <rusty@rustcorp.com.au> | 2014-03-13 11:23:40 +1030 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2014-03-13 11:27:57 +1030 |
| commit | 70670444c20a10717acdc1f4c1e420852995496d (patch) | |
| tree | e3204dac6bc05ab60836ae34695c948ea718be51 /drivers/virtio/virtio_ring.c | |
| parent | 9914a766174d50eb2343f204fef3ee23dbe07c4c (diff) | |
| download | talos-obmc-linux-70670444c20a10717acdc1f4c1e420852995496d.tar.gz talos-obmc-linux-70670444c20a10717acdc1f4c1e420852995496d.zip | |
virtio: fail adding buffer on broken queues.
Heinz points out that adding buffers to a broken virtqueue (which
should "never happen") still works. Failing allows drivers to detect
and complain about broken devices.
Now drivers are robust, we can add this extra check.
Reported-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio/virtio_ring.c')
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 7ae3cba2f624..1e443629f76d 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -204,6 +204,11 @@ static inline int virtqueue_add(struct virtqueue *_vq, BUG_ON(data == NULL); + if (unlikely(vq->broken)) { + END_USE(vq); + return -EIO; + } + #ifdef DEBUG { ktime_t now = ktime_get(); @@ -310,7 +315,7 @@ add_head: * Caller must ensure we don't call this with other virtqueue operations * at the same time (except where noted). * - * Returns zero or a negative error (ie. ENOSPC, ENOMEM). + * Returns zero or a negative error (ie. ENOSPC, ENOMEM, EIO). */ int virtqueue_add_sgs(struct virtqueue *_vq, struct scatterlist *sgs[], @@ -348,7 +353,7 @@ EXPORT_SYMBOL_GPL(virtqueue_add_sgs); * Caller must ensure we don't call this with other virtqueue operations * at the same time (except where noted). * - * Returns zero or a negative error (ie. ENOSPC, ENOMEM). + * Returns zero or a negative error (ie. ENOSPC, ENOMEM, EIO). */ int virtqueue_add_outbuf(struct virtqueue *vq, struct scatterlist sg[], unsigned int num, @@ -370,7 +375,7 @@ EXPORT_SYMBOL_GPL(virtqueue_add_outbuf); * Caller must ensure we don't call this with other virtqueue operations * at the same time (except where noted). * - * Returns zero or a negative error (ie. ENOSPC, ENOMEM). + * Returns zero or a negative error (ie. ENOSPC, ENOMEM, EIO). */ int virtqueue_add_inbuf(struct virtqueue *vq, struct scatterlist sg[], unsigned int num, |
