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authorClemens Ladisch <clemens@ladisch.de>2009-02-16 17:22:39 +0300
committerTakashi Iwai <tiwai@suse.de>2009-02-16 17:31:48 +0300
commite156ac4c571e3be741bc411e58820b74a9295c72 (patch)
tree0242ae04e411c660a2dd92ec217e7abf8bbc3f13 /sound
parentd2f8d7ee1a9b4650b4e43325b321801264f7c37a (diff)
downloadlinux-e156ac4c571e3be741bc411e58820b74a9295c72.tar.xz
sound: usb-audio: fix uninitialized variable with M-Audio MIDI interfaces
Fix the snd_usbmidi_create_endpoints_midiman() function, which forgot to set the out_interval member of the endpoint info structure for Midiman/ M-Audio devices. Since kernel 2.6.24, any non-zero value makes the driver use interrupt transfers instead of bulk transfers. With EHCI controllers, these random interval values result in unbearably large latencies for output MIDI transfers. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Reported-by: David <devurandom@foobox.com> Tested-by: David <devurandom@foobox.com> Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/usb/usbmidi.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 320641ab5be7..26bad373fe65 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -1625,6 +1625,7 @@ static int snd_usbmidi_create_endpoints_midiman(struct snd_usb_midi* umidi,
}
ep_info.out_ep = get_endpoint(hostif, 2)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+ ep_info.out_interval = 0;
ep_info.out_cables = endpoint->out_cables & 0x5555;
err = snd_usbmidi_out_endpoint_create(umidi, &ep_info, &umidi->endpoints[0]);
if (err < 0)