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ALSA: usb-audio: fix uac control query argument

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This patch fixes code readability and should have no functional change.

Correct uac control query functions to account for the 1-based indexing
of USB Audio Class control identifiers.

The function parameter, u8 control, should be the
constant defined in audio-v2.h to identify the control to be checked for
readability or writeability.

This patch fixes all callers that had adjusted, and makes explicit
the mapping between audio_feature_info[] array index and the associated
control identifier.

Signed-off-by: Andrew Chant <achant@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Andrew Chant
2018-03-22 14:39:55 -07:00
committed by Takashi Iwai
parent 9a2fe9b801
commit 21e9b3e931
3 changed files with 48 additions and 30 deletions
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5
sound/usb/clock.c
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@@ -214,7 +214,7 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
/* If a clock source can't tell us whether it's valid, we assume it is */
if (!uac_v2v3_control_is_readable(bmControls,
UAC2_CS_CONTROL_CLOCK_VALID - 1))
UAC2_CS_CONTROL_CLOCK_VALID))
return 1;
err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
@@ -552,7 +552,8 @@ static int set_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
bmControls = cs_desc->bmControls;
}
writeable = uac_v2v3_control_is_writeable(bmControls, UAC2_CS_CONTROL_SAM_FREQ - 1);
writeable = uac_v2v3_control_is_writeable(bmControls,
UAC2_CS_CONTROL_SAM_FREQ);
if (writeable) {
data = cpu_to_le32(rate);
err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,