[Bug 85771] unable to handle kernel NULL pointer dereference in dce6_bandwidth_update

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=85771

--- Comment #1 from Ben Hutchings <ben@decadent.org.uk> ---
(In reply to Frederik Himpe from comment #0)
> [    6.440842] BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000090
> [    6.441017] IP: [<ffffffffa04e08c3>] dce6_bandwidth_update+0x43/0x100
> [radeon]
> [    6.441143] PGD 0 
> [    6.441241] Oops: 0000 [#1] SMP 
> [    6.441380] Modules linked in: snd_hda_codec_hdmi x86_pkg_temp_thermal
> evdev intel_powerclamp snd_hda_codec_realtek iTCO_wdt intel_rapl
> iTCO_vendor_support snd_hda_codec_generic acpi_cpufreq(-) coretemp kvm_intel
> kvm crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul
> glue_helper ablk_helper psmouse cryptd pcspkr serio_raw snd_hda_intel(+)
> snd_hda_controller sr_mod sg cdrom radeon(+) snd_hda_codec ttm snd_hwdep
> drm_kms_helper snd_pcm nuvoton_cir video intel_smartconnect drm rc_core
> battery tpm_tis i2c_algo_bit tpm i2c_i801 snd_timer ehci_pci ehci_hcd snd
> i2c_core xhci_hcd mei_me soundcore processor button mei usbcore lpc_ich
> ie31200_edac usb_common mfd_core edac_core thermal_sys fuse autofs4 btrfs
> xor raid6_pq dm_mod netconsole configfs sd_mod crc_t10dif crct10dif_generic
> ahci libahci crct10dif_pclmul crct10dif_common crc32c_intel libata scsi_mod
> r8169 mii shpchp
> [    6.445512] CPU: 3 PID: 933 Comm: laptop_mode Not tainted 3.17.2.1 #1
[...]
> [    6.447200]  [<ffffffffa04b8ffe>] ? radeon_set_dpm_state+0x6e/0xe0
> [radeon]
> [    6.447255]  [<ffffffff81222f23>] ? kernfs_fop_write+0xe3/0x160
> [    6.447307]  [<ffffffff811b0bd2>] ? vfs_write+0xb2/0x1f0
[...]

So this is triggered by laptop_mode writing to the dpm_state attribute. 
Presumably that doesn't happen if the driver fails to initialise at boot (as it
will with modeset=0) and is reloaded after booting.

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