[Nouveau] [PATCH 0/2] drm/nouveau: Fix panic on nouveau unload.

[Jeffery Miller]

If have a couple patches I found while looking at a panic
I was seeing while unloading the nouveau module.

Unloading the nouveau module on my optimus notebook machine causes
the system to panic. This started occuring when moving from 4.4
to 4.14.

These patches make it such that the system does not panic
when unloading the module.

4.14 also requires commit 34112bf4935d ("drm/nouveau/fbcon: fix NULL
pointer access in nouveau_fbcon_destroy") which was already included in
the 4.18 tree.

These patches make it so I can unload the module without a panic but
there is a warning when unloading the module:
 sysfs group 'power' not found for kobject 'nv_backlight'
 WARNING: CPU: 2 PID: 1434 at fs/sysfs/group.c:235 sysfs_remove_group+0x76/0x80
 RIP: 0010:sysfs_remove_group+0x76/0x80
 Call Trace:
  device_del+0x56/0x350
  ? down_write+0xe/0x40
  device_unregister+0x16/0x60
  nouveau_backlight_exit+0x4a/0x60 [nouveau]
  nouveau_display_destroy+0x29/0x80 [nouveau]
  nouveau_drm_unload+0x61/0xd0 [nouveau]
  drm_dev_unregister+0x3f/0xe0 [drm]
  drm_put_dev+0x27/0x50 [drm]
  nouveau_drm_device_remove+0x47/0x70 [nouveau]
  pci_device_remove+0x3b/0xb0
  device_release_driver_internal+0x180/0x250
  driver_detach+0x32/0x5f
  bus_remove_driver+0x74/0xc6
  pci_unregister_driver+0x22/0xa0
  nouveau_drm_exit+0x15/0x16b [nouveau]

I don't beleive them to be related. Perhaps there is another issue here?

Jeffery Miller (2):
  drm/nouveau/fbcon: Fix NULL pointer access in nouveau_fbcon_destroy.
  drm/nouveau/bl: Allocate backlight connector nodes.

 drivers/gpu/drm/nouveau/nouveau_backlight.c | 70 ++++++++++++++-------
 drivers/gpu/drm/nouveau/nouveau_fbcon.c     |  5 +-
 2 files changed, 51 insertions(+), 24 deletions(-)

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2.17.1