[PATCH 7/8] drm/msm: Small msm_gem_purge() fix

Rob Clark
2021-04-05T17:42:32Z

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@chromium.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