[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: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 039f27d..45157d3 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -773,6 +773,31 @@
}
+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 @@
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);