Commit 06ffc1eb authored by Eldad Zack's avatar Eldad Zack Committed by Takashi Iwai
Browse files

ALSA: usb-audio: UAC2: do clock validity check earlier 



Move the check that parse_audio_format_rates_v2() do after
receiving the clock source entity ID directly into the find
function and add a validation flag to the function.

This patch does not introduce any logic flow change.

It is provided to allow introducing automatic clock switching
easier later. By moving this uac_clock_source_is_valid callsite,
2 additional callsites can be avoided.

Signed-off-by: default avatarEldad Zack <eldad@fogrefinery.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent f6a8bc70

sound/usb/clock.c

+18 −16
Original line number Diff line number Diff line
@@ -131,7 +131,8 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, int source_id) 
}



static int __uac_clock_find_source(struct snd_usb_audio *chip,

				   int entity_id, unsigned long *visited)

				   int entity_id, unsigned long *visited,

				   bool validate)

{

	struct uac_clock_source_descriptor *source;

	struct uac_clock_selector_descriptor *selector;
@@ -148,8 +149,15 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, 


	/* first, see if the ID we're looking for is a clock source already */

	source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);

	if (source)

		return source->bClockID;

	if (source) {

		entity_id = source->bClockID;

		if (validate && !uac_clock_source_is_valid(chip, entity_id)) {

			snd_printk(KERN_ERR "usb-audio:%d: clock source %d is not valid, cannot use\n",

				   chip->dev->devnum, entity_id);

			return -ENXIO;

		}

		return entity_id;

	}



	selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);

	if (selector) {
@@ -164,7 +172,7 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, 
		/* Selector values are one-based */



		if (ret > selector->bNrInPins || ret < 1) {

			printk(KERN_ERR

			snd_printk(KERN_ERR

				"%s(): selector reported illegal value, id %d, ret %d\n",

				__func__, selector->bClockID, ret);
@@ -172,14 +180,14 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, 
		}



		return __uac_clock_find_source(chip, selector->baCSourceID[ret-1],

					       visited);

					       visited, validate);

	}



	/* FIXME: multipliers only act as pass-thru element for now */

	multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);

	if (multiplier)

		return __uac_clock_find_source(chip, multiplier->bCSourceID,

						visited);

						visited, validate);



	return -EINVAL;

}
@@ -195,11 +203,12 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, 
 *

 * Returns the clock source UnitID (>=0) on success, or an error.

 */

int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id)

int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id,

			      bool validate)

{

	DECLARE_BITMAP(visited, 256);

	memset(visited, 0, sizeof(visited));

	return __uac_clock_find_source(chip, entity_id, visited);

	return __uac_clock_find_source(chip, entity_id, visited, validate);

}



static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
@@ -275,18 +284,11 @@ static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface, 
	struct usb_device *dev = chip->dev;

	__le32 data;

	int err, cur_rate, prev_rate;

	int clock = snd_usb_clock_find_source(chip, fmt->clock);

	int clock = snd_usb_clock_find_source(chip, fmt->clock, true);



	if (clock < 0)

		return clock;



	if (!uac_clock_source_is_valid(chip, clock)) {

		/* TODO: should we try to find valid clock setups by ourself? */

		snd_printk(KERN_ERR "%d:%d:%d: clock source %d is not valid, cannot use\n",

			   dev->devnum, iface, fmt->altsetting, clock);

		return -ENXIO;

	}



	prev_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);



	data = cpu_to_le32(rate);

sound/usb/clock.h

+2 −1
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface, 
			     struct usb_host_interface *alts,

			     struct audioformat *fmt, int rate);



int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id);

int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id,

			     bool validate);



#endif /* __USBAUDIO_CLOCK_H */

sound/usb/format.c

+1 −1
Original line number Diff line number Diff line
@@ -280,7 +280,7 @@ static int parse_audio_format_rates_v2(struct snd_usb_audio *chip, 
	struct usb_device *dev = chip->dev;

	unsigned char tmp[2], *data;

	int nr_triplets, data_size, ret = 0;

	int clock = snd_usb_clock_find_source(chip, fp->clock);

	int clock = snd_usb_clock_find_source(chip, fp->clock, false);



	if (clock < 0) {

		snd_printk(KERN_ERR "%s(): unable to find clock source (clock %d)\n",

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