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Commit 68d890a3 authored by Michał Mirosław's avatar Michał Mirosław Committed by Thierry Reding
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drm/tegra: Fix NULL deref in debugfs/iova 



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

Signed-off-by: default avatarMichał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 7664b2fa

drivers/gpu/drm/tegra/drm.c

+5 −3
Original line number Diff line number Diff line
@@ -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);



	if (tegra->domain) {

		mutex_lock(&tegra->mm_lock);

		drm_mm_print(&tegra->mm, &p);

		mutex_unlock(&tegra->mm_lock);

	}



	return 0;

}