[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>

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 5d32857ff9554b0c4d7b8c9dbc037f67b241508d..600d990ddc90e43c8a0d728f514d675a07a27df1 100644 (file)
--- 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;