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  1. Nov 29, 2018
    • Takashi Iwai's avatar
      ALSA: pcm: Call snd_pcm_unlink() conditionally at closing · b51abed8
      Takashi Iwai authored
      
      
      Currently the PCM core calls snd_pcm_unlink() always unconditionally
      at closing a stream.  However, since snd_pcm_unlink() invokes the
      global rwsem down, the lock can be easily contended.  More badly, when
      a thread runs in a high priority RT-FIFO, it may stall at spinning.
      
      Basically the call of snd_pcm_unlink() is required only for the linked
      streams that are already rare occasion.  For normal use cases, this
      code path is fairly superfluous.
      
      As an optimization (and also as a workaround for the RT problem
      above in normal situations without linked streams), this patch adds a
      check before calling snd_pcm_unlink() and calls it only when needed.
      
      Reported-by: default avatarChanho Min <chanho.min@lge.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      b51abed8
  2. Nov 28, 2018
  3. Nov 27, 2018
  4. Nov 26, 2018
  5. Nov 25, 2018
    • Takashi Iwai's avatar
      ALSA: control: Fix race between adding and removing a user element · e1a7bfe3
      Takashi Iwai authored
      
      
      The procedure for adding a user control element has some window opened
      for race against the concurrent removal of a user element.  This was
      caught by syzkaller, hitting a KASAN use-after-free error.
      
      This patch addresses the bug by wrapping the whole procedure to add a
      user control element with the card->controls_rwsem, instead of only
      around the increment of card->user_ctl_count.
      
      This required a slight code refactoring, too.  The function
      snd_ctl_add() is split to two parts: a core function to add the
      control element and a part calling it.  The former is called from the
      function for adding a user control element inside the controls_rwsem.
      
      One change to be noted is that snd_ctl_notify() for adding a control
      element gets called inside the controls_rwsem as well while it was
      called outside the rwsem.  But this should be OK, as snd_ctl_notify()
      takes another (finer) rwlock instead of rwsem, and the call of
      snd_ctl_notify() inside rwsem is already done in another code path.
      
      Reported-by: default avatar <syzbot+dc09047bce3820621ba2@syzkaller.appspotmail.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      e1a7bfe3
    • Takashi Iwai's avatar
      ALSA: sparc: Fix invalid snd_free_pages() at error path · 9a20332a
      Takashi Iwai authored
      
      
      Some spurious calls of snd_free_pages() have been overlooked and
      remain in the error paths of sparc cs4231 driver code.  Since
      runtime->dma_area is managed by the PCM core helper, we shouldn't
      release manually.
      
      Drop the superfluous calls.
      
      Reviewed-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      9a20332a
    • Takashi Iwai's avatar
      ALSA: wss: Fix invalid snd_free_pages() at error path · 7b691541
      Takashi Iwai authored
      
      
      Some spurious calls of snd_free_pages() have been overlooked and
      remain in the error paths of wss driver code.  Since runtime->dma_area
      is managed by the PCM core helper, we shouldn't release manually.
      
      Drop the superfluous calls.
      
      Reviewed-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      7b691541
  6. Nov 24, 2018
  7. Nov 23, 2018
  8. Nov 21, 2018
  9. Nov 19, 2018
  10. Nov 16, 2018
  11. Nov 15, 2018
    • Tzung-Bi Shih's avatar
      ASoC: dapm: Recalculate audio map forcely when card instantiated · 882eab6c
      Tzung-Bi Shih authored
      
      
      Audio map are possible in wrong state before card->instantiated has
      been set to true.  Imaging the following examples:
      
      time 1: at the beginning
      
        in:-1    in:-1    in:-1    in:-1
       out:-1   out:-1   out:-1   out:-1
       SIGGEN        A        B      Spk
      
      time 2: after someone called snd_soc_dapm_new_widgets()
      (e.g. create_fill_widget_route_map() in sound/soc/codecs/hdac_hdmi.c)
      
         in:1     in:0     in:0     in:0
        out:0    out:0    out:0    out:1
       SIGGEN        A        B      Spk
      
      time 3: routes added
      
         in:1     in:0     in:0     in:0
        out:0    out:0    out:0    out:1
       SIGGEN -----> A -----> B ---> Spk
      
      In the end, the path should be powered on but it did not.  At time 3,
      "in" of SIGGEN and "out" of Spk did not propagate to their neighbors
      because snd_soc_dapm_add_path() will not invalidate the paths if
      the card has not instantiated (i.e. card->instantiated is false).
      To correct the state of audio map, recalculate the whole map forcely.
      
      Signed-off-by: default avatarTzung-Bi Shih <tzungbi@google.com>
      Signed-off-by: default avatarMark Brown <broonie@kernel.org>
      882eab6c
    • Peter Ujfalusi's avatar
      ASoC: omap-abe-twl6040: Fix missing audio card caused by deferred probing · 76836fd3
      Peter Ujfalusi authored
      
      
      The machine driver fails to probe in next-20181113 with:
      
      [    2.539093] omap-abe-twl6040 sound: ASoC: CODEC DAI twl6040-legacy not registered
      [    2.546630] omap-abe-twl6040 sound: devm_snd_soc_register_card() failed: -517
      ...
      [    3.693206] omap-abe-twl6040 sound: ASoC: Both platform name/of_node are set for TWL6040
      [    3.701446] omap-abe-twl6040 sound: ASoC: failed to init link TWL6040
      [    3.708007] omap-abe-twl6040 sound: devm_snd_soc_register_card() failed: -22
      [    3.715148] omap-abe-twl6040: probe of sound failed with error -22
      
      Bisect pointed to a merge commit:
      first bad commit: [0f688ab20a540aafa984c5dbd68a71debebf4d7f] Merge remote-tracking branch 'net-next/master'
      
      and a diff between a working kernel does not reveal anything which would
      explain the change in behavior.
      
      Further investigation showed that on the second try of loading fails
      because the dai_link->platform is no longer NULL and it might be pointing
      to uninitialized memory.
      
      The fix is to move the snd_soc_dai_link and snd_soc_card inside of the
      abe_twl6040 struct, which is dynamically allocated every time the driver
      probes.
      
      Signed-off-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
      Signed-off-by: default avatarMark Brown <broonie@kernel.org>
      76836fd3
  12. Nov 14, 2018
  13. Nov 12, 2018
  14. Nov 09, 2018
  15. Nov 07, 2018
  16. Nov 06, 2018
    • Takashi Iwai's avatar
      ALSA: hda - Fix incorrect clearance of thinkpad_acpi hooks · 5e93a125
      Takashi Iwai authored
      Since the commit c647f806 ("ALSA: hda - Allow multiple ADCs for
      mic mute LED controls") we allow enabling the mic mute LED with
      multiple ADCs.  The commit changed the function return value to be
      zero or a negative error, while this change was overlooked in the
      thinkpad_acpi helper code where it still expects a positive return
      value for success.  This eventually leads to a NULL dereference on a
      system that has only a mic mute LED.
      
      This patch corrects the return value check in the corresponding code
      as well.
      
      Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=201621
      Fixes: c647f806
      
       ("ALSA: hda - Allow multiple ADCs for mic mute LED controls")
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      5e93a125
  17. Nov 05, 2018