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| author | Ard van Breemen <ard@kwaak.net> | 2019-08-02 13:52:14 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-08-06 12:52:15 +0200 |
| commit | 1b34121d9f26d272b0b2334209af6b6fc82d4bf1 (patch) | |
| tree | 71d649d08e5592cdfae0d7a0c4c014e57a7db906 /sound/usb | |
| parent | f7f530181461aaf6afa0b3f0be4d239dea410896 (diff) | |
| download | linux-1b34121d9f26d272b0b2334209af6b6fc82d4bf1.tar.bz2 | |
ALSA: usb-audio: Skip bSynchAddress endpoint check if it is invalid
The Linux kernel assumes that get_endpoint(alts,0) and
get_endpoint(alts,1) are eachothers feedback endpoints.
To reassure that validity it will test bsynchaddress to comply with that
assumption. But if the bsyncaddress is 0 (invalid), it will flag that as
a wrong assumption and return an error.
Fix: Skip the test if bSynchAddress is 0.
Note: those with a valid bSynchAddress should have a code quirck added.
Signed-off-by: Ard van Breemen <ard@kwaak.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/pcm.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 75b96929f76c..51a8faf25ed8 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -456,6 +456,7 @@ static int set_sync_endpoint(struct snd_usb_substream *subs, } ep = get_endpoint(alts, 1)->bEndpointAddress; if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && + get_endpoint(alts, 0)->bSynchAddress != 0 && ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) || (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) { dev_err(&dev->dev, |