ALSA: usb-audio: Deprecate async_unlink option

The async unlink behavior has been working over years.  The option was
provided only as a workaround for 2.4.x kernel.  Let's get rid of it.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 0 insertions, 3 deletions

diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index d90d8ec2853d..b9cfd339a6fa 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -1905,7 +1905,6 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
     vid             - Vendor ID for the device (optional)
     pid             - Product ID for the device (optional)
     nrpacks         - Max. number of packets per URB (default: 8)
-    async_unlink    - Use async unlink mode (default: yes)
     device_setup    - Device specific magic number (optional)
                     - Influence depends on the device
                     - Default: 0x0000 
@@ -1917,8 +1916,6 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
     NB: nrpacks parameter can be modified dynamically via sysfs.
         Don't put the value over 20.  Changing via sysfs has no sanity
         check.
-    NB: async_unlink=0 would cause Oops.  It remains just for
-        debugging purpose (if any).
     NB: ignore_ctl_error=1 may help when you get an error at accessing
         the mixer element such as URB error -22.  This happens on some
         buggy USB device or the controller.