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authorLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2016-10-19 00:51:35 +0300
committerLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2016-11-15 01:44:47 +0200
commit4f7b0d263833928e947e172eff2d2997179c5cb9 (patch)
tree8cb33779ca7f519b36a328f494efda065d2a5321 /drivers
parent05ee29e94acf0d4b3998c3f93374952de8f90176 (diff)
drm: rcar-du: Simplify and fix probe error handling
It isn't safe to call drm_dev_unregister() without first initializing mode setting with drm_mode_config_init(). This leads to a crash if either IO memory can't be remapped or vblank initialization fails. Fix this by reordering the initialization sequence. Move vblank initialization after the drm_mode_config_init() call, and move IO remapping before drm_dev_alloc() to avoid the need to perform clean up in case of failure. While at it remove the explicit drm_vblank_cleanup() call from rcar_du_remove() as the drm_dev_unregister() function already cleans up vblank. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/rcar-du/rcar_du_drv.c30
-rw-r--r--drivers/gpu/drm/rcar-du/rcar_du_kms.c7
2 files changed, 17 insertions, 20 deletions
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index b619a8024ec9..4f0acea1e013 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -285,7 +285,6 @@ static int rcar_du_remove(struct platform_device *pdev)
drm_kms_helper_poll_fini(ddev);
drm_mode_config_cleanup(ddev);
- drm_vblank_cleanup(ddev);
drm_dev_unref(ddev);
@@ -299,7 +298,7 @@ static int rcar_du_probe(struct platform_device *pdev)
struct resource *mem;
int ret;
- /* Allocate and initialize the DRM and R-Car device structures. */
+ /* Allocate and initialize the R-Car device structure. */
rcdu = devm_kzalloc(&pdev->dev, sizeof(*rcdu), GFP_KERNEL);
if (rcdu == NULL)
return -ENOMEM;
@@ -309,31 +308,22 @@ static int rcar_du_probe(struct platform_device *pdev)
rcdu->dev = &pdev->dev;
rcdu->info = of_match_device(rcar_du_of_table, rcdu->dev)->data;
- ddev = drm_dev_alloc(&rcar_du_driver, &pdev->dev);
- if (IS_ERR(ddev))
- return PTR_ERR(ddev);
-
- rcdu->ddev = ddev;
- ddev->dev_private = rcdu;
-
platform_set_drvdata(pdev, rcdu);
/* I/O resources */
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem);
- if (IS_ERR(rcdu->mmio)) {
- ret = PTR_ERR(rcdu->mmio);
- goto error;
- }
-
- /* Initialize vertical blanking interrupts handling. Start with vblank
- * disabled for all CRTCs.
- */
- ret = drm_vblank_init(ddev, (1 << rcdu->info->num_crtcs) - 1);
- if (ret < 0)
- goto error;
+ if (IS_ERR(rcdu->mmio))
+ return PTR_ERR(rcdu->mmio);
/* DRM/KMS objects */
+ ddev = drm_dev_alloc(&rcar_du_driver, &pdev->dev);
+ if (IS_ERR(ddev))
+ return PTR_ERR(ddev);
+
+ rcdu->ddev = ddev;
+ ddev->dev_private = rcdu;
+
ret = rcar_du_modeset_init(rcdu);
if (ret < 0) {
if (ret != -EPROBE_DEFER)
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index d3ab10602e3e..184ed7a155f6 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -559,6 +559,13 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
if (ret < 0)
return ret;
+ /* Initialize vertical blanking interrupts handling. Start with vblank
+ * disabled for all CRTCs.
+ */
+ ret = drm_vblank_init(dev, (1 << rcdu->info->num_crtcs) - 1);
+ if (ret < 0)
+ return ret;
+
/* Initialize the groups. */
num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);