On 2014년 10월 08일 00:28, Inki Dae wrote:

Sorry for late.

On 2014년 10월 07일 21:27, Andrzej Hajda wrote:

...

Hi Inki,

Gently ping.

Andrzej

On 09/19/2014 02:57 PM, Andrzej Hajda wrote:

...

Initialization of vblank with MAX_CRTC caused attempts to disabling vblanks for non-existing crtcs in case drm used fewer crtcs. The patch fixes it.

Nice catch~ This patch also resolves unbind issue. When exynos driver is unbound, disable_vblank callback is called as dev->num_crtcs so if the number of probed crtc drivers is different from the one of enabled crtc

Oops, s/the one of enabled crtc drivers/MAX_CRTC

drivers then it could attempt to disabling vblank for non-existing crtc, which in turn, null pointer access occurs.

Thanks, Inki Dae

...

...

Signed-off-by: Andrzej Hajda a.hajda@samsung.com

drivers/gpu/drm/exynos/exynos_drm_drv.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c index 9b00e4e..dc4affd 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c @@ -94,10 +94,6 @@ static int exynos_drm_load(struct drm_device *dev, unsigned long flags) /* init kms poll for handling hpd */ drm_kms_helper_poll_init(dev);

• ret = drm_vblank_init(dev, MAX_CRTC);
• if (ret)

• goto err_mode_config_cleanup;
  

• /* setup possible_clones. */ exynos_drm_encoder_setup(dev);

@@ -106,22 +102,26 @@ static int exynos_drm_load(struct drm_device *dev, unsigned long flags) /* Try to bind all sub drivers. */ ret = component_bind_all(dev->dev, dev); if (ret)

• goto err_cleanup_vblank;
  

• goto err_mode_config_cleanup;
  

• ret = drm_vblank_init(dev, dev->mode_config.num_crtc);

• if (ret)

• goto err_unbind_all;
  
  

  /* Probe non kms sub drivers and virtual display driver. */ ret = exynos_drm_device_subdrv_probe(dev); if (ret)

• goto err_unbind_all;
  

• goto err_cleanup_vblank;
  
  

  /* force connectors detection */ drm_helper_hpd_irq_event(dev);

  return 0;

-err_unbind_all:

• component_unbind_all(dev->dev, dev);

err_cleanup_vblank: drm_vblank_cleanup(dev); +err_unbind_all:

• component_unbind_all(dev->dev, dev);

err_mode_config_cleanup: drm_mode_config_cleanup(dev); drm_release_iommu_mapping(dev); @@ -138,8 +138,8 @@ static int exynos_drm_unload(struct drm_device *dev) exynos_drm_fbdev_fini(dev); drm_kms_helper_poll_fini(dev);

• component_unbind_all(dev->dev, dev); drm_vblank_cleanup(dev);

• component_unbind_all(dev->dev, dev); drm_mode_config_cleanup(dev); drm_release_iommu_mapping(dev);

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