linux-kernel - [PATCH] RDMA/mlx4: Use bitmap

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Date:   Thu, 25 Nov 2021 20:42:51 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     yishaih@...dia.com, selvin.xavier@...adcom.com,
        dledford@...hat.com, jgg@...pe.ca
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] RDMA/mlx4: Use bitmap_alloc() when applicable

Use 'bitmap_alloc()' to simplify code, improve the semantic and avoid some
open-coded arithmetic in allocator arguments.

Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
consistency.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/infiniband/hw/mlx4/main.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index 0d2fa3338784..d66ce7694bbe 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -2784,10 +2784,8 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
 		if (err)
 			goto err_counter;
 
-		ibdev->ib_uc_qpns_bitmap =
-			kmalloc_array(BITS_TO_LONGS(ibdev->steer_qpn_count),
-				      sizeof(long),
-				      GFP_KERNEL);
+		ibdev->ib_uc_qpns_bitmap = bitmap_alloc(ibdev->steer_qpn_count,
+							GFP_KERNEL);
 		if (!ibdev->ib_uc_qpns_bitmap)
 			goto err_steer_qp_release;
 
@@ -2875,7 +2873,7 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
 	mlx4_ib_diag_cleanup(ibdev);
 
 err_steer_free_bitmap:
-	kfree(ibdev->ib_uc_qpns_bitmap);
+	bitmap_free(ibdev->ib_uc_qpns_bitmap);
 
 err_steer_qp_release:
 	mlx4_qp_release_range(dev, ibdev->steer_qpn_base,
@@ -2988,7 +2986,7 @@ static void mlx4_ib_remove(struct mlx4_dev *dev, void *ibdev_ptr)
 
 	mlx4_qp_release_range(dev, ibdev->steer_qpn_base,
 			      ibdev->steer_qpn_count);
-	kfree(ibdev->ib_uc_qpns_bitmap);
+	bitmap_free(ibdev->ib_uc_qpns_bitmap);
 
 	iounmap(ibdev->uar_map);
 	for (p = 0; p < ibdev->num_ports; ++p)
-- 
2.30.2