[PATCH] drm: omapdrm: Fix oops on rmmod

[Tomi Valkeinen]

On 23/03/17 19:04, Tony Lindgren wrote:
> Looks like in Linux next we can now get an oops when unloading omapdrm:
> 
> Unable to handle kernel NULL pointer dereference at virtual address
> 00000000
> ...
> LR is at omap_drm_irq_uninstall+0xb0/0xe0 [omapdrm]
> ...
> [<bf6806a8>] (omap_drm_irq_uninstall [omapdrm]) from [<bf67f260>]
> (pdev_remove+0x50/0x88 [omapdrm])
> [<bf67f260>] (pdev_remove [omapdrm]) from [<c058fa28>]
> (platform_drv_remove+0x24/0x3c)
> [<c058fa28>] (platform_drv_remove) from [<c058ddb8>]
> (device_release_driver_internal+0x160/0x1f4)
> [<c058ddb8>] (device_release_driver_internal) from [<c058de90>]
> (driver_detach+0x38/0x6c)
> [<c058de90>] (driver_detach) from [<c058d0b8>]
> (bus_remove_driver+0x4c/0xa0)
> [<c058d0b8>] (bus_remove_driver) from [<c058fb1c>]
> (platform_unregister_drivers+0x24/0x30)
> [<c058fb1c>] (platform_unregister_drivers) from [<c01e26e8>]
> (SyS_delete_module+0x150/0x218)
> [<c01e26e8>] (SyS_delete_module) from [<c01077a0>]
> (ret_fast_syscall+0x0/0x1c)
> 
> Fix the issue by checking get_vblank_counter() before trying to
> call it.

Yep, there was a change in the DRM core that broke omapdrm. I've been
trying to understand how to fix this. I hope I can send a patch today.

 Tomi

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