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(parent: 964af63) | patch
ALSA: usb-audio: Avoid superfluous usb_set_interface() calls
authorTakashi Iwai <tiwai@suse.de>
Wed, 2 May 2018 07:36:28 +0000 (09:36 +0200)
committerTakashi Iwai <tiwai@suse.de>
Wed, 2 May 2018 14:02:33 +0000 (16:02 +0200)
commitb099b9693d23d035c77c218508e083484ff63024
treee5146fb1601205061cf55e0f82d01cac5c513e47tree | snapshot
parent964af639ad699404cbe36d0c1fc85970700e6107commit | diff
ALSA: usb-audio: Avoid superfluous usb_set_interface() calls

This is a preliminary change for the upcoming quirk implementation.

Currently USB-audio driver tries to call usb_set_interface() whenever
the format change with interface/altset modification happens.  In this
patch, the check is replaced with the comparison of cur_altsetting and
the targeted altsetting pointer, so that the driver may skip the
unnecessary function calls.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/usb/pcm.c diff | blob | history
John Crispins staging tree