linux-kernel - [PATCH] RDMA/rtrs: client: Fix clt_path::max_pages_per

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Message-ID: <20251223034324.13706-1-honggangli@163.com>
Date: Tue, 23 Dec 2025 11:43:24 +0800
From: Honggang LI <honggangli@....com>
To: jinpu.wang@...os.com,
	danil.kipnis@...ud.ionos.com
Cc: jgg@...pe.ca,
	leon@...nel.org,
	linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Honggang LI <honggangli@....com>
Subject: [PATCH] RDMA/rtrs: client: Fix clt_path::max_pages_per_mr calculation

If the low two bytes of ib_dev::attrs::max_mr_size are zeros, the `min3`
function will set clt_path::max_pages_per_mr to zero.

`alloc_path_reqs` will pass zero, which is invalid,  as the third parameter
to `ib_alloc_mr`.

Fixes: 6a98d71daea1 ("RDMA/rtrs: client: main functionality")
Signed-off-by: Honggang LI <honggangli@....com>
---
 drivers/infiniband/ulp/rtrs/rtrs-clt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
index 71387811b281..b9d66e4fab07 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
@@ -1465,7 +1465,7 @@ static void query_fast_reg_mode(struct rtrs_clt_path *clt_path)
 	max_pages_per_mr   = ib_dev->attrs.max_mr_size;
 	do_div(max_pages_per_mr, (1ull << mr_page_shift));
 	clt_path->max_pages_per_mr =
-		min3(clt_path->max_pages_per_mr, (u32)max_pages_per_mr,
+		min(min_not_zero(clt_path->max_pages_per_mr, (u32)max_pages_per_mr),
 		     ib_dev->attrs.max_fast_reg_page_list_len);
 	clt_path->clt->max_segments =
 		min(clt_path->max_pages_per_mr, clt_path->clt->max_segments);
-- 
2.52.0