[ALSA] usb-audio: add error message about missing split iso support
Modules: USB generic driver
Add an error message for -ENOSYS for situations when split iso support
is needed but not enabled.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 45157d3..6fad2c4 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -788,6 +788,10 @@
return "device disabled";
case -EHOSTUNREACH:
return "device suspended";
+#ifndef CONFIG_USB_EHCI_SPLIT_ISO
+ case -ENOSYS:
+ return "enable CONFIG_USB_EHCI_SPLIT_ISO to play through a hub";
+#endif
case -EINVAL:
case -EAGAIN:
case -EFBIG: