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drm/msm: Fix error handling crashes seen when VRAM allocation fails 

If VRAM allocation fails, the error handling path crashes in
msm_drm_uninit(). The following changes are made to fix this:

msm_gem_shrinker_cleanup() is fixed to unregister the shrinker only
if it was init-ed in the first place.

Before calling kms->funcs->destroy(), we check if kms->funcs is also
non-NULL. This is needed for MDP5, since during msm_drm_int(), priv->kms
becomes non-NULL early, but msm_kms_init() is called on it only later
in mdp5_kms_init().

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
This commit is contained in:
Archit Taneja 2016-11-03 17:36:18 +05:30 committed by Rob Clark
parent 67cba0fbb4
commit 16976085a1
2 changed files with 6 additions and 3 deletions
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2
drivers/gpu/drm/msm/msm_drv.c
View File

@ -228,7 +228,7 @@ static int msm_drm_uninit(struct device *dev)
flush_workqueue(priv->atomic_wq);
destroy_workqueue(priv->atomic_wq);
if (kms)
if (kms && kms->funcs)
kms->funcs->destroy(kms);
if (gpu) {

7
drivers/gpu/drm/msm/msm_gem_shrinker.c
View File

@ -163,6 +163,9 @@ void msm_gem_shrinker_init(struct drm_device *dev)
void msm_gem_shrinker_cleanup(struct drm_device *dev)
{
struct msm_drm_private *priv = dev->dev_private;
WARN_ON(unregister_vmap_purge_notifier(&priv->vmap_notifier));
unregister_shrinker(&priv->shrinker);
if (priv->shrinker.nr_deferred) {
WARN_ON(unregister_vmap_purge_notifier(&priv->vmap_notifier));
unregister_shrinker(&priv->shrinker);
}
}