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drm/tegra: Fix error handling cleanup

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The DRM driver's ->load() implementation didn't do a good job (no job at
all really) cleaning up on failure. Fix that by undoing any prior setup
when an error occurs. This requires a bit of rework to make it possible
to clean up fbdev midway.

This was tested by injecting errors at various points during the
initialization sequence and verifying that error cleanup didn't crash
and no memory leaked (using kmemleak).

Reported-by: Stéphane Marchesin <marcheu@chromium.org>
Reported-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding
2014-11-06 14:12:08 +01:00
parent 53ea72132d
commit 1d1e6fe9b5
3 changed files with 34 additions and 7 deletions
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1
drivers/gpu/drm/tegra/drm.h
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@@ -288,6 +288,7 @@ bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer);
int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer,
struct tegra_bo_tiling *tiling);
int tegra_drm_fb_prepare(struct drm_device *drm);
void tegra_drm_fb_free(struct drm_device *drm);
int tegra_drm_fb_init(struct drm_device *drm);
void tegra_drm_fb_exit(struct drm_device *drm);
#ifdef CONFIG_DRM_TEGRA_FBDEV