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R. Silva" , linux-kernel@vger.kernel.org (open list), linux-hardening@vger.kernel.org (open list:KERNEL HARDENING (not covered by other areas):Keyword:\b__counted_by(_le|_be)?\b) Subject: [PATCH] drm: dp_tunnel: use kzalloc_flex Date: Sun, 8 Mar 2026 14:12:20 -0700 Message-ID: <20260308211220.33759-1-rosenp@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Simplifies allocation by using a flexible array member to remove a second kzalloc. Added __counted_by for extra runtime analysis. Simplify assignment loop. It always returns true. That is, max_group_count is always equal to group_count. Signed-off-by: Rosen Penev --- drivers/gpu/drm/display/drm_dp_tunnel.c | 26 ++++++------------------- 1 file changed, 6 insertions(+), 20 deletions(-) diff --git a/drivers/gpu/drm/display/drm_dp_tunnel.c b/drivers/gpu/drm/disp= lay/drm_dp_tunnel.c index f442430d8de7..aad1605b956e 100644 --- a/drivers/gpu/drm/display/drm_dp_tunnel.c +++ b/drivers/gpu/drm/display/drm_dp_tunnel.c @@ -188,13 +188,13 @@ struct drm_dp_tunnel_group { struct drm_dp_tunnel_mgr { struct drm_device *dev; =20 - int group_count; - struct drm_dp_tunnel_group *groups; wait_queue_head_t bw_req_queue; =20 #ifdef CONFIG_DRM_DISPLAY_DP_TUNNEL_STATE_DEBUG struct ref_tracker_dir ref_tracker; #endif + int group_count; + struct drm_dp_tunnel_group groups[] __counted_by(group_count); }; =20 /* @@ -1893,7 +1893,6 @@ static void destroy_mgr(struct drm_dp_tunnel_mgr *mgr) ref_tracker_dir_exit(&mgr->ref_tracker); #endif =20 - kfree(mgr->groups); kfree(mgr); } =20 @@ -1913,33 +1912,20 @@ drm_dp_tunnel_mgr_create(struct drm_device *dev, in= t max_group_count) struct drm_dp_tunnel_mgr *mgr; int i; =20 - mgr =3D kzalloc_obj(*mgr); + mgr =3D kzalloc_flex(*mgr, groups, max_group_count); if (!mgr) return ERR_PTR(-ENOMEM); =20 + mgr->group_count =3D max_group_count; mgr->dev =3D dev; init_waitqueue_head(&mgr->bw_req_queue); =20 - mgr->groups =3D kzalloc_objs(*mgr->groups, max_group_count); - if (!mgr->groups) { - kfree(mgr); - - return ERR_PTR(-ENOMEM); - } - #ifdef CONFIG_DRM_DISPLAY_DP_TUNNEL_STATE_DEBUG ref_tracker_dir_init(&mgr->ref_tracker, 16, "drm_dptun"); #endif =20 - for (i =3D 0; i < max_group_count; i++) { - if (!init_group(mgr, &mgr->groups[i])) { - destroy_mgr(mgr); - - return ERR_PTR(-ENOMEM); - } - - mgr->group_count++; - } + for (i =3D 0; i < max_group_count; i++) + init_group(mgr, &mgr->groups[i]); =20 return mgr; } --=20 2.53.0