tree a7c90361007998b9615817f6c05adbb74763f2f4
parent e8d65a8d985271a102f07c7456da5b86c19ffe16
author Takashi Iwai <tiwai@suse.de> 1445351035 +0200
committer Takashi Iwai <tiwai@suse.de> 1445351494 +0200

ALSA: hda - Fix deadlock at error in building PCM

The HDA codec driver issues snd_hda_codec_reset() at the error path of
PCM build.  This was needed in the earlier code base, but the recent
rewrite to use the standard bus binding made this a deadlock:
 modprobe        D 0000000000000005     0   720    716 0x00000080
 Call Trace:
  [<ffffffff816a5dbe>] schedule+0x3e/0x90
  [<ffffffff816a61a5>] schedule_preempt_disabled+0x15/0x20
  [<ffffffff816a7ae5>] __mutex_lock_slowpath+0xb5/0x120
  [<ffffffff816a7b6b>] mutex_lock+0x1b/0x30
  [<ffffffff8148656b>] device_release_driver+0x1b/0x30
  [<ffffffff81485c15>] bus_remove_device+0x105/0x180
  [<ffffffff814822b9>] device_del+0x139/0x260
  [<ffffffffa05e0ec5>] snd_hdac_device_unregister+0x25/0x30 [snd_hda_core]
  [<ffffffffa074fa6a>] snd_hda_codec_reset+0x2a/0x70 [snd_hda_codec]
  [<ffffffffa075007b>] snd_hda_codec_build_pcms+0x18b/0x1b0 [snd_hda_codec]
  [<ffffffffa074a44e>] hda_codec_driver_probe+0xbe/0x140 [snd_hda_codec]
  [<ffffffff81486ac4>] driver_probe_device+0x1f4/0x460
  [<ffffffff81486dc0>] __driver_attach+0x90/0xa0
  [<ffffffff81484844>] bus_for_each_dev+0x64/0xa0
  [<ffffffff814862de>] driver_attach+0x1e/0x20
  [<ffffffff81485e7b>] bus_add_driver+0x1eb/0x280
  [<ffffffff81487680>] driver_register+0x60/0xe0
  [<ffffffffa074a0da>] __hda_codec_driver_register+0x5a/0x60 [snd_hda_codec]
  [<ffffffffa070a01e>] realtek_driver_init+0x1e/0x1000 [snd_hda_codec_realtek]
  [<ffffffff810002f3>] do_one_initcall+0xb3/0x200
  [<ffffffff816a1fc5>] do_init_module+0x60/0x1f8
  [<ffffffff810ee5c3>] load_module+0x1653/0x1bd0
  [<ffffffff810eed48>] SYSC_finit_module+0x98/0xc0
  [<ffffffff810eed8e>] SyS_finit_module+0xe/0x10
  [<ffffffff816aa032>] entry_SYSCALL_64_fastpath+0x16/0x75

The simple fix is just to remove this call, since we don't need to
think about unbinding at there any longer.

Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=948758
Cc: <stable@vger.kernel.org> # v4.1+
Signed-off-by: Takashi Iwai <tiwai@suse.de>