diff options
author | Henry Lin <henryl@nvidia.com> | 2019-11-13 05:14:19 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-25 17:53:42 +0300 |
commit | d99926e1ae70fb604b6891b8b7efefe8f32a5f3f (patch) | |
tree | 0a54b218002f592d0b999c76a369353f6f2b1a2a | |
parent | 66aeb2294c223b8c7e098794466602c04c96affd (diff) | |
download | linux-d99926e1ae70fb604b6891b8b7efefe8f32a5f3f.tar.xz |
ALSA: usb-audio: not submit urb for stopped endpoint
commit 528699317dd6dc722dccc11b68800cf945109390 upstream.
While output urb's snd_complete_urb() is executing, calling
prepare_outbound_urb() may cause endpoint stopped before
prepare_outbound_urb() returns and result in next urb submitted
to stopped endpoint. usb-audio driver cannot re-use it afterwards as
the urb is still hold by usb stack.
This change checks EP_FLAG_RUNNING flag after prepare_outbound_urb() again
to let snd_complete_urb() know the endpoint already stopped and does not
submit next urb. Below kind of error will be fixed:
[ 213.153103] usb 1-2: timeout: still 1 active urbs on EP #1
[ 213.164121] usb 1-2: cannot submit urb 0, error -16: unknown error
Signed-off-by: Henry Lin <henryl@nvidia.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191113021420.13377-1-henryl@nvidia.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | sound/usb/endpoint.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index ae2981460cd8..66648b4bdd28 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -403,6 +403,9 @@ static void snd_complete_urb(struct urb *urb) } prepare_outbound_urb(ep, ctx); + /* can be stopped during prepare callback */ + if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) + goto exit_clear; } else { retire_inbound_urb(ep, ctx); /* can be stopped during retire callback */ |