linux-kernel - [PATCH 7/8] drm/msm: Small msm_gem

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Date:   Mon,  5 Apr 2021 10:45:30 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Jordan Crouse <jordan@...micpenguin.net>,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        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 7/8] drm/msm: Small msm_gem_purge() fix

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

Shoot down any mmap's *first* before put_pages().  Also add a WARN_ON
that the object is locked (to make it clear that this doesn't race with
msm_gem_fault()) and remove a redundant WARN_ON (since is_purgable()
already covers that case).

Fixes: 68209390f116 ("drm/msm: shrinker support")
Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gem.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 9ac89951080c..163a1d30b5c9 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -729,14 +729,16 @@ void msm_gem_purge(struct drm_gem_object *obj)
 	struct drm_device *dev = obj->dev;
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 
+	GEM_WARN_ON(!msm_gem_is_locked(obj));
 	GEM_WARN_ON(!is_purgeable(msm_obj));
-	GEM_WARN_ON(obj->import_attach);
 
 	/* Get rid of any iommu mapping(s): */
 	put_iova_spaces(obj, true);
 
 	msm_gem_vunmap(obj);
 
+	drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
+
 	put_pages(obj);
 
 	put_iova_vmas(obj);
@@ -744,7 +746,6 @@ void msm_gem_purge(struct drm_gem_object *obj)
 	msm_obj->madv = __MSM_MADV_PURGED;
 	update_inactive(msm_obj);
 
-	drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
 	drm_gem_free_mmap_offset(obj);
 
 	/* Our goal here is to return as much of the memory as
-- 
2.30.2