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| author | Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com> | 2010-09-29 18:06:54 -0700 |
|---|---|---|
| committer | Eric Van Hensbergen <ericvh@gmail.com> | 2010-10-28 09:08:48 -0500 |
| commit | 419b39561e698d73a42f8010655d22e0134486da (patch) | |
| tree | 76b6bd98dcaaa89d27b2d804d1ed67f049f070bd /net | |
| parent | 329176cc2c50e63c580ddaabb385876db5af1360 (diff) | |
| download | linux-3.10-419b39561e698d73a42f8010655d22e0134486da.tar.gz linux-3.10-419b39561e698d73a42f8010655d22e0134486da.tar.bz2 linux-3.10-419b39561e698d73a42f8010655d22e0134486da.zip | |
[net/9p]Serialize virtqueue operations to make VirtIO transport SMP safe.
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/9p/trans_virtio.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c index b88515936e4..8ae08596aad 100644 --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -134,16 +134,24 @@ static void req_done(struct virtqueue *vq) struct p9_fcall *rc; unsigned int len; struct p9_req_t *req; + unsigned long flags; P9_DPRINTK(P9_DEBUG_TRANS, ": request done\n"); - while ((rc = virtqueue_get_buf(chan->vq, &len)) != NULL) { - P9_DPRINTK(P9_DEBUG_TRANS, ": rc %p\n", rc); - P9_DPRINTK(P9_DEBUG_TRANS, ": lookup tag %d\n", rc->tag); - req = p9_tag_lookup(chan->client, rc->tag); - req->status = REQ_STATUS_RCVD; - p9_client_cb(chan->client, req); - } + do { + spin_lock_irqsave(&chan->lock, flags); + rc = virtqueue_get_buf(chan->vq, &len); + spin_unlock_irqrestore(&chan->lock, flags); + + if (rc != NULL) { + P9_DPRINTK(P9_DEBUG_TRANS, ": rc %p\n", rc); + P9_DPRINTK(P9_DEBUG_TRANS, ": lookup tag %d\n", + rc->tag); + req = p9_tag_lookup(chan->client, rc->tag); + req->status = REQ_STATUS_RCVD; + p9_client_cb(chan->client, req); + } + } while (rc != NULL); } /** @@ -199,23 +207,29 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req) int in, out; struct virtio_chan *chan = client->trans; char *rdata = (char *)req->rc+sizeof(struct p9_fcall); + unsigned long flags; + int err; P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio request\n"); + req->status = REQ_STATUS_SENT; + + spin_lock_irqsave(&chan->lock, flags); out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, req->tc->sdata, req->tc->size); in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM-out, rdata, client->msize); - req->status = REQ_STATUS_SENT; - - if (virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc) < 0) { + err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc); + if (err < 0) { + spin_unlock_irqrestore(&chan->lock, flags); P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio rpc add_buf returned failure"); return -EIO; } virtqueue_kick(chan->vq); + spin_unlock_irqrestore(&chan->lock, flags); P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio request kicked\n"); return 0; |