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svcrdma: Return error from rdma_read_xdr so caller knows to free context
The rdma_read_xdr function did not discriminate between no read-list and an error posting the read-list. This results in a leak of a page if there is an error posting the read-list. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
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1 changed files with 16 additions and 7 deletions
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@ -260,11 +260,16 @@ static int rdma_read_max_sge(struct svcxprt_rdma *xprt, int sge_count)
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* On our side, we need to read into a pagelist. The first page immediately
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* follows the RPC header.
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*
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* This function returns 1 to indicate success. The data is not yet in
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* This function returns:
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* 0 - No error and no read-list found.
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*
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* 1 - Successful read-list processing. The data is not yet in
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* the pagelist and therefore the RPC request must be deferred. The
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* I/O completion will enqueue the transport again and
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* svc_rdma_recvfrom will complete the request.
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*
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* <0 - Error processing/posting read-list.
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*
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* NOTE: The ctxt must not be touched after the last WR has been posted
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* because the I/O completion processing may occur on another
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* processor and free / modify the context. Ne touche pas!
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@ -398,7 +403,7 @@ static int rdma_read_xdr(struct svcxprt_rdma *xprt,
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svc_rdma_put_context(head, 1);
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head = ctxt;
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}
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return 0;
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return err;
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}
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return 1;
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@ -532,14 +537,18 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
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goto close_out;
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}
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/* Read read-list data. If we would need to wait, defer
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* it. Not that in this case, we don't return the RQ credit
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* until after the read completes.
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*/
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if (rdma_read_xdr(rdma_xprt, rmsgp, rqstp, ctxt)) {
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/* Read read-list data. */
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ret = rdma_read_xdr(rdma_xprt, rmsgp, rqstp, ctxt);
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if (ret > 0) {
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/* read-list posted, defer until data received from client. */
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svc_xprt_received(xprt);
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return 0;
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}
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if (ret < 0) {
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/* Post of read-list failed, free context. */
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svc_rdma_put_context(ctxt, 1);
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return 0;
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}
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ret = rqstp->rq_arg.head[0].iov_len
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+ rqstp->rq_arg.page_len
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