lkml.org 
[lkml]   [2020]   [Sep]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH AUTOSEL 5.4 220/330] ALSA: usb-audio: Fix case when USB MIDI interface has more than one extra endpoint descriptor
    Date
    From: Andreas Steinmetz <ast@domdv.de>

    [ Upstream commit 5c6cd7021a05a02fcf37f360592d7c18d4d807fb ]

    The Miditech MIDIFACE 16x16 (USB ID 1290:1749) has more than one extra
    endpoint descriptor.

    The first extra descriptor is: 0x06 0x30 0x00 0x00 0x00 0x00

    As the code in snd_usbmidi_get_ms_info() looks only at the
    first extra descriptor to find USB_DT_CS_ENDPOINT the device
    as such is recognized but there is neither input nor output
    configured.

    The patch iterates through the extra descriptors to find the
    proper one. With this patch the device is correctly configured.

    Signed-off-by: Andreas Steinmetz <ast@domdv.de>
    Link: https://lore.kernel.org/r/1c3b431a86f69e1d60745b6110cdb93c299f120b.camel@domdv.de
    Signed-off-by: Takashi Iwai <tiwai@suse.de>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    sound/usb/midi.c | 29 ++++++++++++++++++++++++-----
    1 file changed, 24 insertions(+), 5 deletions(-)

    diff --git a/sound/usb/midi.c b/sound/usb/midi.c
    index 0cb4142b05f64..bc9068b616bb9 100644
    --- a/sound/usb/midi.c
    +++ b/sound/usb/midi.c
    @@ -1827,6 +1827,28 @@ static int snd_usbmidi_create_endpoints(struct snd_usb_midi *umidi,
    return 0;
    }

    +static struct usb_ms_endpoint_descriptor *find_usb_ms_endpoint_descriptor(
    + struct usb_host_endpoint *hostep)
    +{
    + unsigned char *extra = hostep->extra;
    + int extralen = hostep->extralen;
    +
    + while (extralen > 3) {
    + struct usb_ms_endpoint_descriptor *ms_ep =
    + (struct usb_ms_endpoint_descriptor *)extra;
    +
    + if (ms_ep->bLength > 3 &&
    + ms_ep->bDescriptorType == USB_DT_CS_ENDPOINT &&
    + ms_ep->bDescriptorSubtype == UAC_MS_GENERAL)
    + return ms_ep;
    + if (!extra[0])
    + break;
    + extralen -= extra[0];
    + extra += extra[0];
    + }
    + return NULL;
    +}
    +
    /*
    * Returns MIDIStreaming device capabilities.
    */
    @@ -1864,11 +1886,8 @@ static int snd_usbmidi_get_ms_info(struct snd_usb_midi *umidi,
    ep = get_ep_desc(hostep);
    if (!usb_endpoint_xfer_bulk(ep) && !usb_endpoint_xfer_int(ep))
    continue;
    - ms_ep = (struct usb_ms_endpoint_descriptor *)hostep->extra;
    - if (hostep->extralen < 4 ||
    - ms_ep->bLength < 4 ||
    - ms_ep->bDescriptorType != USB_DT_CS_ENDPOINT ||
    - ms_ep->bDescriptorSubtype != UAC_MS_GENERAL)
    + ms_ep = find_usb_ms_endpoint_descriptor(hostep);
    + if (!ms_ep)
    continue;
    if (usb_endpoint_dir_out(ep)) {
    if (endpoints[epidx].out_ep) {
    --
    2.25.1
    \
     
     \ /
      Last update: 2020-09-18 05:01    [W:4.100 / U:0.244 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site