[PATCH 3/5] 9p: fix error handle in 'post_recv()'

[Ye Bin <yebin@huaweicloud.com>]

From: Ye Bin <yebin10@huawei.com>

There are two issues in 'post_recv()':
1. Miss unmap request if receive request failed;
2. Miss release 'rdma->rq_sem' if post receive failed or mapping failed;

So add miss release 'rdma->rq_sem' and unmap request when do error handle.

Signed-off-by: Ye Bin <yebin10@huawei.com>
---
 net/9p/trans_rdma.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/net/9p/trans_rdma.c b/net/9p/trans_rdma.c
index ae2bac9bf510..bcab550c2e2c 100644
--- a/net/9p/trans_rdma.c
+++ b/net/9p/trans_rdma.c
@@ -386,6 +386,7 @@ post_recv(struct p9_client *client, struct p9_rdma_context *c)
 	struct p9_trans_rdma *rdma = client->trans;
 	struct ib_recv_wr wr;
 	struct ib_sge sge;
+	int err = -EIO;
 
 	c->busa = ib_dma_map_single(rdma->cm_id->device,
 				    c->rc.sdata, client->msize,
@@ -403,11 +404,17 @@ post_recv(struct p9_client *client, struct p9_rdma_context *c)
 	wr.wr_cqe = &c->cqe;
 	wr.sg_list = &sge;
 	wr.num_sge = 1;
-	return ib_post_recv(rdma->qp, &wr, NULL);
-
+	err = ib_post_recv(rdma->qp, &wr, NULL);
+	if (err) {
+		ib_dma_unmap_single(rdma->cm_id->device, c->busa,
+				    client->msize, DMA_FROM_DEVICE);
+		goto error;
+	}
+	return 0;
  error:
+	up(&rdma->rq_sem);
 	p9_debug(P9_DEBUG_ERROR, "EIO\n");
-	return -EIO;
+	return err;
 }
 
 static int rdma_request(struct p9_client *client, struct p9_req_t *req)
-- 
2.31.1