linux-kernel - [PATCH v2 18/22] drm/msm: Drop struct_mutex in free

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Message-Id: <20201012020958.229288-19-robdclark@gmail.com>
Date:   Sun, 11 Oct 2020 19:09:45 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        freedreno@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 18/22] drm/msm: Drop struct_mutex in free_object() path

From: Rob Clark <robdclark@...omium.org>

Now that active_list/inactive_list is protected by mm_lock, we no longer
need dev->struct_mutex in the free_object() path.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gem.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index cdbbdd848fe3..9ead1bf223e9 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -934,8 +934,6 @@ static void free_object(struct msm_gem_object *msm_obj)
 	struct drm_device *dev = obj->dev;
 	struct msm_drm_private *priv = dev->dev_private;
 
-	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
-
 	/* object should not be on active list: */
 	WARN_ON(is_active(msm_obj));
 
@@ -972,20 +970,14 @@ void msm_gem_free_work(struct work_struct *work)
 {
 	struct msm_drm_private *priv =
 		container_of(work, struct msm_drm_private, free_work);
-	struct drm_device *dev = priv->dev;
 	struct llist_node *freed;
 	struct msm_gem_object *msm_obj, *next;
 
 	while ((freed = llist_del_all(&priv->free_list))) {
-
-		mutex_lock(&dev->struct_mutex);
-
 		llist_for_each_entry_safe(msm_obj, next,
 					  freed, freed)
 			free_object(msm_obj);
 
-		mutex_unlock(&dev->struct_mutex);
-
 		if (need_resched())
 			break;
 	}
-- 
2.26.2