[PATCH] RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters

[kensanya@163.com]

From: TanZheng <tanzheng@kylinos.cn>

When srpt_alloc_rw_ctxs() fails partway through a multi-buffer indirect
descriptor, the unwind path destroys RDMA contexts but leaves stale
n_rw_ctx and n_rdma values (and a dangling rw_ctxs pointer). Later
sq_wr_avail accounting in srpt_queue_response() or srpt_write_pending()
can then subtract the wrong number of send queue credits.

Reset the counters and rw_ctxs pointer before returning an error.

Fixes: b99f8e4d7bcd ("IB/srpt: convert to the generic RDMA READ/WRITE API")
Signed-off-by: TanZheng <tanzheng@kylinos.cn>
---
 drivers/infiniband/ulp/srpt/ib_srpt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index f66cfd70c263..4644429fae14 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -1016,6 +1016,9 @@ static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,
 	}
 	if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
 		kfree(ioctx->rw_ctxs);
+	ioctx->rw_ctxs = &ioctx->s_rw_ctx;
+	ioctx->n_rw_ctx = 0;
+	ioctx->n_rdma = 0;
 	return ret;
 }
 
-- 
2.25.1