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virtio: make add_buf return capacity remaining

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This API change means that virtio_net can tell how much capacity
remains for buffers.  It's necessarily fuzzy, since
VIRTIO_RING_F_INDIRECT_DESC means we can fit any number of descriptors
in one, *if* we can kmalloc.

Signed-off-by: Rusty Russell <[email protected]>
Cc: Dinesh Subhraveti <[email protected]>
This commit is contained in:
Rusty Russell 2009-09-23 22:26:31 -06:00
commit 3c1b27d504
8 changed files with 19 additions and 15 deletions
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2
drivers/block/virtio_blk.c
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@ -139,7 +139,7 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
}
}
if (vblk->vq->vq_ops->add_buf(vblk->vq, vblk->sg, out, in, vbr)) {
if (vblk->vq->vq_ops->add_buf(vblk->vq, vblk->sg, out, in, vbr) < 0) {
mempool_free(vbr, vblk->pool);
return false;
}