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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-09-21 08:48:33 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-09-21 08:48:33 +0100 |
| commit | f70cac8d9c7125f83048f8b3d1c60f5a041a165c (patch) | |
| tree | 0d0efd72c1a41f973a919b16aac1d8210ed1ee30 /net/9p/trans_virtio.c | |
| parent | 4722cd7741c6404f967f7a7b8b666540b6c1663e (diff) | |
| parent | 08aab447c56a5388cf0c768da476ad022f00fef8 (diff) | |
| download | linux-rt-f70cac8d9c7125f83048f8b3d1c60f5a041a165c.tar.gz | |
Merge branch 'kprobes-test' of git://git.yxit.co.uk/linux into devel-stable
Diffstat (limited to 'net/9p/trans_virtio.c')
| -rw-r--r-- | net/9p/trans_virtio.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c index 175b5135bdcf..e317583fcc73 100644 --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -263,7 +263,6 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req) { int in, out, inp, outp; struct virtio_chan *chan = client->trans; - char *rdata = (char *)req->rc+sizeof(struct p9_fcall); unsigned long flags; size_t pdata_off = 0; struct trans_rpage_info *rpinfo = NULL; @@ -346,7 +345,8 @@ req_retry_pinned: * Arrange in such a way that server places header in the * alloced memory and payload onto the user buffer. */ - inp = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, rdata, 11); + inp = pack_sg_list(chan->sg, out, + VIRTQUEUE_NUM, req->rc->sdata, 11); /* * Running executables in the filesystem may result in * a read request with kernel buffer as opposed to user buffer. @@ -366,8 +366,8 @@ req_retry_pinned: } in += inp; } else { - in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, rdata, - req->rc->capacity); + in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, + req->rc->sdata, req->rc->capacity); } err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc); @@ -592,7 +592,14 @@ static struct p9_trans_module p9_virtio_trans = { .close = p9_virtio_close, .request = p9_virtio_request, .cancel = p9_virtio_cancel, - .maxsize = PAGE_SIZE*VIRTQUEUE_NUM, + + /* + * We leave one entry for input and one entry for response + * headers. We also skip one more entry to accomodate, address + * that are not at page boundary, that can result in an extra + * page in zero copy. + */ + .maxsize = PAGE_SIZE * (VIRTQUEUE_NUM - 3), .pref = P9_TRANS_PREF_PAYLOAD_SEP, .def = 0, .owner = THIS_MODULE, |