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Rex Zhu b62ce39767 drm/amdgpu: fix null point error when rmmod amdgpu.
this bug happened when amdgpu load failed.

[   75.740951] BUG: unable to handle kernel paging request at 00000000000031c0
[   75.748167] IP: [<ffffffffa064a0e0>] amdgpu_fbdev_restore_mode+0x20/0x60 [amdgpu]
[   75.755774] PGD 0

[   75.759185] Oops: 0000 [#1] SMP
[   75.762408] Modules linked in: amdgpu(OE-) ttm(OE) drm_kms_helper(OE) drm(OE) i2c_algo_bit(E) fb_sys_fops(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) rpcsec_gss_krb5(E) nfsv4(E) nfs(E) fscache(E) eeepc_wmi(E) asus_wmi(E) sparse_keymap(E) intel_rapl(E) snd_hda_codec_hdmi(E) snd_hda_codec_realtek(E) snd_hda_codec_generic(E) snd_hda_intel(E) snd_hda_codec(E) snd_hda_core(E) x86_pkg_temp_thermal(E) intel_powerclamp(E) snd_hwdep(E) snd_pcm(E) snd_seq_midi(E) coretemp(E) kvm_intel(E) snd_seq_midi_event(E) snd_rawmidi(E) kvm(E) snd_seq(E) joydev(E) snd_seq_device(E) snd_timer(E) irqbypass(E) crct10dif_pclmul(E) crc32_pclmul(E) mei_me(E) ghash_clmulni_intel(E) snd(E) aesni_intel(E) mei(E) soundcore(E) aes_x86_64(E) shpchp(E) serio_raw(E) lrw(E) acpi_pad(E) gf128mul(E) glue_helper(E) ablk_helper(E) mac_hid(E)
[   75.835574]  cryptd(E) parport_pc(E) ppdev(E) lp(E) nfsd(E) parport(E) auth_rpcgss(E) nfs_acl(E) lockd(E) grace(E) sunrpc(E) autofs4(E) hid_generic(E) usbhid(E) mxm_wmi(E) psmouse(E) e1000e(E) ptp(E) pps_core(E) ahci(E) libahci(E) wmi(E) video(E) i2c_hid(E) hid(E)
[   75.858489] CPU: 5 PID: 1603 Comm: rmmod Tainted: G           OE   4.9.0-custom #2
[   75.866183] Hardware name: System manufacturer System Product Name/Z170-A, BIOS 0901 08/31/2015
[   75.875050] task: ffff88045d1bbb80 task.stack: ffffc90002de4000
[   75.881094] RIP: 0010:[<ffffffffa064a0e0>]  [<ffffffffa064a0e0>] amdgpu_fbdev_restore_mode+0x20/0x60 [amdgpu]
[   75.891238] RSP: 0018:ffffc90002de7d48  EFLAGS: 00010286
[   75.896648] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[   75.903933] RDX: 0000000000000000 RSI: ffff88045d1bbb80 RDI: 0000000000000286
[   75.911183] RBP: ffffc90002de7d50 R08: 0000000000000502 R09: 0000000000000004
[   75.918449] R10: 0000000000000000 R11: 0000000000000001 R12: ffff880464bf0000
[   75.925675] R13: ffffffffa0853000 R14: 0000000000000000 R15: 0000564e44f88210
[   75.932980] FS:  00007f13d5400700(0000) GS:ffff880476540000(0000) knlGS:0000000000000000
[   75.941238] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   75.947088] CR2: 00000000000031c0 CR3: 000000045fd0b000 CR4: 00000000003406e0
[   75.954332] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   75.961566] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   75.968834] Stack:
[   75.970881]  ffff880464bf0000 ffffc90002de7d60 ffffffffa0636592 ffffc90002de7d80
[   75.978454]  ffffffffa059015f ffff880464bf0000 ffff880464bf0000 ffffc90002de7da8
[   75.986076]  ffffffffa0595216 ffff880464bf0000 ffff880460f4d000 ffffffffa0853000
[   75.993692] Call Trace:
[   75.996177]  [<ffffffffa0636592>] amdgpu_driver_lastclose_kms+0x12/0x20 [amdgpu]
[   76.003700]  [<ffffffffa059015f>] drm_lastclose+0x2f/0xd0 [drm]
[   76.009777]  [<ffffffffa0595216>] drm_dev_unregister+0x16/0xd0 [drm]
[   76.016255]  [<ffffffffa0595944>] drm_put_dev+0x34/0x70 [drm]
[   76.022139]  [<ffffffffa062f365>] amdgpu_pci_remove+0x15/0x20 [amdgpu]
[   76.028800]  [<ffffffff81416499>] pci_device_remove+0x39/0xc0
[   76.034661]  [<ffffffff81531caa>] __device_release_driver+0x9a/0x140
[   76.041121]  [<ffffffff81531e58>] driver_detach+0xb8/0xc0
[   76.046575]  [<ffffffff81530c95>] bus_remove_driver+0x55/0xd0
[   76.052401]  [<ffffffff815325fc>] driver_unregister+0x2c/0x50
[   76.058244]  [<ffffffff81416289>] pci_unregister_driver+0x29/0x90
[   76.064466]  [<ffffffffa0596c5e>] drm_pci_exit+0x9e/0xb0 [drm]
[   76.070507]  [<ffffffffa0796d71>] amdgpu_exit+0x1c/0x32 [amdgpu]
[   76.076609]  [<ffffffff81104810>] SyS_delete_module+0x1a0/0x200
[   76.082627]  [<ffffffff810e2b1a>] ? rcu_eqs_enter.isra.36+0x4a/0x50
[   76.089001]  [<ffffffff8100392e>] do_syscall_64+0x6e/0x180
[   76.094583]  [<ffffffff817e1d2f>] entry_SYSCALL64_slow_path+0x25/0x25
[   76.101114] Code: 94 c0 c3 31 c0 5d c3 0f 1f 40 00 0f 1f 44 00 00 55 31 c0 48 89 e5 53 48 89 fb 48 c7 c7 1d 21 84 a0 e8 ab 77 b3 e0 e8 fc 8b d7 e0 <48> 8b bb c0 31 00 00 48 85 ff 74 09 e8 ff eb fc ff 85 c0 75 03
[   76.121432] RIP  [<ffffffffa064a0e0>] amdgpu_fbdev_restore_mode+0x20/0x60 [amdgpu]

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2017-05-25 12:53:25 -04:00
arch sparc/ftrace: Fix ftrace graph time measurement 2017-05-17 12:07:47 -07:00
block Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 2017-05-12 15:43:10 -07:00
certs scripts/spelling.txt: add "intialise(d)" pattern and fix typo instances 2017-05-08 17:15:13 -07:00
crypto treewide: use kv[mz]alloc* rather than opencoded variants 2017-05-08 17:15:13 -07:00
Documentation mm, docs: update memory.stat description with workingset* entries 2017-05-12 15:57:16 -07:00
drivers drm/amdgpu: fix null point error when rmmod amdgpu. 2017-05-25 12:53:25 -04:00
firmware firmware/Makefile: force recompilation if makefile changes 2017-05-08 17:15:10 -07:00
fs Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6 2017-05-15 15:27:02 -07:00
include net: x25: fix one potential use-after-free issue 2017-05-18 10:05:40 -04:00
init Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-10 10:30:46 -07:00
ipc mm: introduce kv[mz]alloc helpers 2017-05-08 17:15:12 -07:00
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-05-18 11:40:21 -07:00
lib dmaengine updates for 4.12-rc1 2017-05-09 15:40:28 -07:00
mm mm: vmscan: scan until it finds eligible pages 2017-05-12 15:57:16 -07:00
net sctp: do not inherit ipv6_{mc|ac|fl}_list from parent 2017-05-18 10:24:08 -04:00
samples samples/bpf: run cleanup routines when receiving SIGTERM 2017-05-11 21:43:30 -04:00
scripts kbuild: skip install/check of headers right under uapi directories 2017-05-18 02:17:45 +09:00
security Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-05-09 09:12:53 -07:00
sound drm/i915: Fix runtime PM for LPE audio 2017-05-15 14:44:11 +03:00
tools selftests/bpf: fix broken build due to types.h 2017-05-17 18:45:14 -04:00
usr initramfs: provide a way to ignore image provided by bootloader 2017-05-08 17:15:12 -07:00
virt Second round of KVM/ARM Changes for v4.12. 2017-05-09 12:51:49 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Add hch to .get_maintainer.ignore 2015-08-21 14:30:10 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: Add support to generate LLVM assembly files 2017-04-25 08:13:52 +09:00
.mailmap power supply and reset changes for the v4.12 series (part 2) 2017-05-12 12:02:21 -07:00
COPYING
CREDITS avr32: remove support for AVR32 architecture 2017-05-01 09:27:15 +02:00
Kbuild kbuild: Consolidate header generation from ASM offset information 2017-04-13 05:43:37 +09:00
Kconfig
MAINTAINERS Tigran has moved 2017-05-12 15:57:15 -07:00
Makefile kbuild: skip install/check of headers right under uapi directories 2017-05-18 02:17:45 +09:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.