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Subject[PATCH 5.4 43/80] drm/panfrost: Fix a race in panfrost_ioctl_madvise()
Date
From: Boris Brezillon <boris.brezillon@collabora.com>

commit 70cc77952efebf6722d483cb83cfb563ac9768db upstream.

If 2 threads change the MADVISE property of the same BO in parallel we
might end up with an shmem->madv value that's inconsistent with the
presence of the BO in the shrinker list.

The easiest solution to fix that is to protect the
drm_gem_shmem_madvise() call with the shrinker lock.

Fixes: 013b65101315 ("drm/panfrost: Add madvise and shrinker support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191129135908.2439529-3-boris.brezillon@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/panfrost/panfrost_drv.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -347,20 +347,19 @@ static int panfrost_ioctl_madvise(struct
return -ENOENT;
}

+ mutex_lock(&pfdev->shrinker_lock);
args->retained = drm_gem_shmem_madvise(gem_obj, args->madv);

if (args->retained) {
struct panfrost_gem_object *bo = to_panfrost_bo(gem_obj);

- mutex_lock(&pfdev->shrinker_lock);
-
if (args->madv == PANFROST_MADV_DONTNEED)
- list_add_tail(&bo->base.madv_list, &pfdev->shrinker_list);
+ list_add_tail(&bo->base.madv_list,
+ &pfdev->shrinker_list);
else if (args->madv == PANFROST_MADV_WILLNEED)
list_del_init(&bo->base.madv_list);
-
- mutex_unlock(&pfdev->shrinker_lock);
}
+ mutex_unlock(&pfdev->shrinker_lock);

drm_gem_object_put_unlocked(gem_obj);
return 0;

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