ALSA: usb-audio: Avoid superfluous usb_set_interface() calls

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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>

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This commit is contained in:

Takashi Iwai 2018-05-02 09:36:28 +02:00

parent 964af639ad

commit b099b9693d

1 changed files with 4 additions and 7 deletions

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sound/usb/pcm.c

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