netdev - [net 03/10] net/mlx5e: Remove redundant xsk pointer check in mlx5e_mpwrq_validate

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Date:   Wed, 18 Jan 2023 00:04:07 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Adham Faris <afaris@...dia.com>,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <error27@...il.com>
Subject: [net 03/10] net/mlx5e: Remove redundant xsk pointer check in mlx5e_mpwrq_validate_xsk

From: Adham Faris <afaris@...dia.com>

This validation function is relevant only for XSK cases, hence it
assumes to be called only with xsk != NULL.
Thus checking for invalid xsk pointer is redundant and misleads static
code analyzers.
This commit removes redundant xsk pointer check.

This solves the following smatch warning:
drivers/net/ethernet/mellanox/mlx5/core/en/params.c:481
mlx5e_mpwrq_validate_xsk() error: we previously assumed 'xsk' could be
null (see line 478)

Fixes: 6470d2e7e8ed ("net/mlx5e: xsk: Use KSM for unaligned XSK")
Signed-off-by: Adham Faris <afaris@...dia.com>
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <error27@...il.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/params.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
index 585bdc8383ee..4ad19c981294 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
@@ -578,7 +578,6 @@ int mlx5e_mpwrq_validate_xsk(struct mlx5_core_dev *mdev, struct mlx5e_params *pa
 {
 	enum mlx5e_mpwrq_umr_mode umr_mode = mlx5e_mpwrq_umr_mode(mdev, xsk);
 	u8 page_shift = mlx5e_mpwrq_page_shift(mdev, xsk);
-	bool unaligned = xsk ? xsk->unaligned : false;
 	u16 max_mtu_pkts;
 
 	if (!mlx5e_check_fragmented_striding_rq_cap(mdev, page_shift, umr_mode))
@@ -591,7 +590,7 @@ int mlx5e_mpwrq_validate_xsk(struct mlx5_core_dev *mdev, struct mlx5e_params *pa
 	 * needed number of WQEs exceeds the maximum.
 	 */
 	max_mtu_pkts = min_t(u8, MLX5E_PARAMS_MAXIMUM_LOG_RQ_SIZE,
-			     mlx5e_mpwrq_max_log_rq_pkts(mdev, page_shift, unaligned));
+			     mlx5e_mpwrq_max_log_rq_pkts(mdev, page_shift, xsk->unaligned));
 	if (params->log_rq_mtu_frames > max_mtu_pkts) {
 		mlx5_core_err(mdev, "Current RQ length %d is too big for XSK with given frame size %u\n",
 			      1 << params->log_rq_mtu_frames, xsk->chunk_size);
-- 
2.39.0