Commit 32e19e88 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Jaroslav Kysela
Browse files

[ALSA] usb-audio: show USB error descriptions 



Modules: USB generic driver

When usb_submit_urb() fails, show an error description instead of just
the error code.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
parent 0243ef71

sound/usb/usbaudio.c

+35 −4
Original line number Diff line number Diff line
@@ -773,6 +773,31 @@ static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sl 
}





static const char *usb_error_string(int err)

{

	switch (err) {

	case -ENODEV:

		return "no device";

	case -ENOENT:

		return "endpoint not enabled";

	case -EPIPE:

		return "endpoint stalled";

	case -ENOSPC:

		return "not enough bandwidth";

	case -ESHUTDOWN:

		return "device disabled";

	case -EHOSTUNREACH:

		return "device suspended";

	case -EINVAL:

	case -EAGAIN:

	case -EFBIG:

	case -EMSGSIZE:

		return "internal error";

	default:

		return "unknown error";

	}

}



/*

 * set up and start data/sync urbs

 */
@@ -805,16 +830,22 @@ static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *ru 
	subs->unlink_mask = 0;

	subs->running = 1;

	for (i = 0; i < subs->nurbs; i++) {

		if ((err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC)) < 0) {

			snd_printk(KERN_ERR "cannot submit datapipe for urb %d, err = %d\n", i, err);

		err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC);

		if (err < 0) {

			snd_printk(KERN_ERR "cannot submit datapipe "

				   "for urb %d, error %d: %s\n",

				   i, err, usb_error_string(err));

			goto __error;

		}

		set_bit(i, &subs->active_mask);

	}

	if (subs->syncpipe) {

		for (i = 0; i < SYNC_URBS; i++) {

			if ((err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC)) < 0) {

				snd_printk(KERN_ERR "cannot submit syncpipe for urb %d, err = %d\n", i, err);

			err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC);

			if (err < 0) {

				snd_printk(KERN_ERR "cannot submit syncpipe "

					   "for urb %d, error %d: %s\n",

					   i, err, usb_error_string(err));

				goto __error;

			}

			set_bit(i + 16, &subs->active_mask);