linux-kernel - [PATCH 5.14 009/100] RDMA/mlx5: Fix xlt_chunk

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Message-Id: <20210924124341.771308696@linuxfoundation.org>
Date:   Fri, 24 Sep 2021 14:43:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Niklas Schnelle <schnelle@...ux.ibm.com>,
        Jason Gunthorpe <jgg@...dia.com>
Subject: [PATCH 5.14 009/100] RDMA/mlx5: Fix xlt_chunk_align calculation

From: Niklas Schnelle <schnelle@...ux.ibm.com>

commit f4c6f31011eafe027abddf6cee1288a1b5a05b73 upstream.

The XLT chunk alignment depends on ent_size not sizeof(ent_size) aka
sizeof(size_t). The incoming ent_size is either 8 or 16, so the
miscalculation when 16 is required is only an over-alignment and
functional harmless.

Fixes: 8010d74b9965 ("RDMA/mlx5: Split the WR setup out of mlx5_ib_update_xlt()")
Link: https://lore.kernel.org/r/20210908081849.7948-2-schnelle@linux.ibm.com
Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/infiniband/hw/mlx5/mr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -995,7 +995,7 @@ static struct mlx5_ib_mr *alloc_cacheabl
 static void *mlx5_ib_alloc_xlt(size_t *nents, size_t ent_size, gfp_t gfp_mask)
 {
 	const size_t xlt_chunk_align =
-		MLX5_UMR_MTT_ALIGNMENT / sizeof(ent_size);
+		MLX5_UMR_MTT_ALIGNMENT / ent_size;
 	size_t size;
 	void *res = NULL;