1) There was a chance that "cursor" or "primary" were error pointers leading to an oops. 2) The error handling wasn't very complete.

When I started working on this, the one err label style error handling became unwieldy so I just re-wrote it with multiple exit labels.

Signed-off-by: Dan Carpenter dan.carpenter@oracle.com --- Compile tested only.

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c index fb2b4b0..8134e30 100644 --- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -1683,8 +1683,8 @@ static int tegra_dc_init(struct host1x_client *client) unsigned long flags = HOST1X_SYNCPT_CLIENT_MANAGED; struct tegra_dc *dc = host1x_client_to_dc(client); struct tegra_drm *tegra = drm->dev_private; - struct drm_plane *primary = NULL; - struct drm_plane *cursor = NULL; + struct drm_plane *primary; + struct drm_plane *cursor; u32 value; int err;

@@ -1706,21 +1706,22 @@ static int tegra_dc_init(struct host1x_client *client) primary = tegra_dc_primary_plane_create(drm, dc); if (IS_ERR(primary)) { err = PTR_ERR(primary); - goto cleanup; + goto detach_iommu; }

+ cursor = NULL; if (dc->soc->supports_cursor) { cursor = tegra_dc_cursor_plane_create(drm, dc); if (IS_ERR(cursor)) { err = PTR_ERR(cursor); - goto cleanup; + goto cleanup_primary; } }

err = drm_crtc_init_with_planes(drm, &dc->base, primary, cursor, &tegra_crtc_funcs, NULL); if (err < 0) - goto cleanup; + goto cleanup_cursor;

drm_mode_crtc_set_gamma_size(&dc->base, 256); drm_crtc_helper_add(&dc->base, &tegra_crtc_helper_funcs); @@ -1735,12 +1736,12 @@ static int tegra_dc_init(struct host1x_client *client) err = tegra_dc_rgb_init(drm, dc); if (err < 0 && err != -ENODEV) { dev_err(dc->dev, "failed to initialize RGB output: %d\n", err); - goto cleanup; + goto cleanup_cursor; }

err = tegra_dc_add_planes(drm, dc); if (err < 0) - goto cleanup; + goto rgb_exit;

if (IS_ENABLED(CONFIG_DEBUG_FS)) { err = tegra_dc_debugfs_init(dc, drm->primary); @@ -1753,7 +1754,7 @@ static int tegra_dc_init(struct host1x_client *client) if (err < 0) { dev_err(dc->dev, "failed to request IRQ#%u: %d\n", dc->irq, err); - goto cleanup; + goto remove_debugfs; }

/* initialize display controller */ @@ -1799,13 +1800,18 @@ static int tegra_dc_init(struct host1x_client *client)

return 0;

-cleanup: - if (cursor) +remove_debugfs: + tegra_dc_debugfs_exit(dc); +rgb_exit: + tegra_dc_rgb_exit(dc); +cleanup_cursor: + if (dc->soc->supports_cursor) drm_plane_cleanup(cursor);

- if (primary) - drm_plane_cleanup(primary); +cleanup_primary: + drm_plane_cleanup(primary);

+detach_iommu: if (tegra->domain) { iommu_detach_device(tegra->domain, dc->dev); dc->domain = NULL;