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drm/tegra: Fix NULL deref in debugfs/iova

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When IOMMU is off, ->mm_lock is not initialized and ->mm is NULL.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Michał Mirosław 2017-08-14 23:53:45 +02:00 • committed by Thierry Reding
parent 7664b2fa42
commit 68d890a3cc
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/tegra/drm.c
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@ -1033,9 +1033,11 @@ static int tegra_debugfs_iova(struct seq_file *s, void *data)
struct tegra_drm *tegra = drm->dev_private;
struct drm_printer p = drm_seq_file_printer(s);
mutex_lock(&tegra->mm_lock);
drm_mm_print(&tegra->mm, &p);
mutex_unlock(&tegra->mm_lock);
if (tegra->domain) {
mutex_lock(&tegra->mm_lock);
drm_mm_print(&tegra->mm, &p);
mutex_unlock(&tegra->mm_lock);
}
return 0;
}