[PATCH] RDMA/hfi1: Propagate sdma_txinit_ahg() errors

[Danila Chernetsov <listdansp@mail.ru>]

set_txreq_header_ahg() ignores the return value of sdma_txinit_ahg().

If sdma_txinit_ahg() fails, it returns before initializing tx->txreq.
However, set_txreq_header_ahg() ignores the error and returns the AHG
change count, causing the caller to continue processing the request as
though initialization had succeeded.

Propagate sdma_txinit_ahg() failures to the caller and abort request
processing when initialization fails.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: e3304b7cc4f1 ("IB/hfi1: Optimize cachelines for user SDMA request structure")
Signed-off-by: Danila Chernetsov <listdansp@mail.ru>
---
 drivers/infiniband/hw/hfi1/user_sdma.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/user_sdma.c b/drivers/infiniband/hw/hfi1/user_sdma.c
index 8ea5ed918a02..be6b82ba93af 100644
--- a/drivers/infiniband/hw/hfi1/user_sdma.c
+++ b/drivers/infiniband/hw/hfi1/user_sdma.c
@@ -1026,6 +1026,7 @@ static int set_txreq_header_ahg(struct user_sdma_request *req,
 				struct user_sdma_txreq *tx, u32 datalen)
 {
 	u32 ahg[AHG_KDETH_ARRAY_SIZE];
+	int ret;
 	int idx = 0;
 	u8 omfactor; /* KDETH.OM */
 	struct hfi1_user_sdma_pkt_q *pq = req->pq;
@@ -1130,11 +1131,13 @@ static int set_txreq_header_ahg(struct user_sdma_request *req,
 	trace_hfi1_sdma_user_header_ahg(pq->dd, pq->ctxt, pq->subctxt,
 					req->info.comp_idx, req->sde->this_idx,
 					req->ahg_idx, ahg, idx, tidval);
-	sdma_txinit_ahg(&tx->txreq,
-			SDMA_TXREQ_F_USE_AHG,
-			datalen, req->ahg_idx, idx,
-			ahg, sizeof(req->hdr),
-			user_sdma_txreq_cb);
+	ret = sdma_txinit_ahg(&tx->txreq,
+				SDMA_TXREQ_F_USE_AHG,
+				datalen, req->ahg_idx, idx,
+				ahg, sizeof(req->hdr),
+				user_sdma_txreq_cb);
+	if (ret)
+		return ret;
 
 	return idx;
 }
-- 
2.25.1