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9P/RDMA: Improve error handling in rdma_request

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Most importantly:
- do not free the recv context (rpl_context) after a successful post_recv()
- but do free the send context (c) after a failed send.

Signed-off-by: Simon Derr <simon.derr@bull.net>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Simon Derr 2013-06-21 15:32:41 +02:00 committed by Eric Van Hensbergen
parent b530e252e2
commit 2f52d07cb7
1 changed files with 28 additions and 16 deletions
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44
net/9p/trans_rdma.c
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@ -430,7 +430,7 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
rpl_context = kmalloc(sizeof *rpl_context, GFP_NOFS);
if (!rpl_context) {
err = -ENOMEM;
goto err_close;
goto recv_error;
}
rpl_context->rc = req->rc;
@ -441,13 +441,15 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
* outstanding request, so we must keep a count to avoid
* overflowing the RQ.
*/
if (down_interruptible(&rdma->rq_sem))
goto error; /* FIXME : -EINTR instead */
if (down_interruptible(&rdma->rq_sem)) {
err = -EINTR;
goto recv_error;
}
err = post_recv(client, rpl_context);
if (err) {
p9_debug(P9_DEBUG_FCALL, "POST RECV failed\n");
goto err_free;
goto recv_error;
}
/* remove posted receive buffer from request structure */
@ -457,15 +459,17 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
c = kmalloc(sizeof *c, GFP_NOFS);
if (!c) {
err = -ENOMEM;
goto err_free;
goto send_error;
}
c->req = req;
c->busa = ib_dma_map_single(rdma->cm_id->device,
c->req->tc->sdata, c->req->tc->size,
DMA_TO_DEVICE);
if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
goto error;
if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) {
err = -EIO;
goto send_error;
}
sge.addr = c->busa;
sge.length = c->req->tc->size;
@ -479,19 +483,27 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
wr.sg_list = &sge;
wr.num_sge = 1;
if (down_interruptible(&rdma->sq_sem))
goto error;
if (down_interruptible(&rdma->sq_sem)) {
err = -EINTR;
goto send_error;
}
return ib_post_send(rdma->qp, &wr, &bad_wr);
err = ib_post_send(rdma->qp, &wr, &bad_wr);
if (err)
goto send_error;
error:
/* Success */
return 0;
/* Handle errors that happened during or while preparing the send: */
send_error:
kfree(c);
p9_debug(P9_DEBUG_ERROR, "Error %d in rdma_request()\n", err);
return err;
/* Handle errors that happened during or while preparing post_recv(): */
recv_error:
kfree(rpl_context);
p9_debug(P9_DEBUG_ERROR, "EIO\n");
return -EIO;
err_free:
kfree(rpl_context);
err_close:
spin_lock_irqsave(&rdma->req_lock, flags);
if (rdma->state < P9_RDMA_CLOSING) {
rdma->state = P9_RDMA_CLOSING;