[ALSA] usb-audio - allow USB MIDI quirks to specify endpoints explicitly

USB generic driver
This patch reintroduces the check for endpoint numbers that are
specified explicitly in the quirk structure.
This check was accidentally dropped in the last rewrite of
snd_usbmidi_detect_endpoints().

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 5d32857ff955..600d990ddc90 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -1229,6 +1229,9 @@ static int snd_usbmidi_detect_endpoints(snd_usb_midi_t* umidi,
         if (le16_to_cpu(umidi->chip->dev->descriptor.idVendor) == 0x0582)
                 snd_usbmidi_switch_roland_altsetting(umidi);
 
+        if (endpoint[0].out_ep || endpoint[0].in_ep)
+                return 0;       
+
         intf = umidi->iface;
         if (!intf || intf->num_altsetting < 1)
                 return -ENOENT;