| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 45/62] ALSA: usb-audio: Fix implicit fb endpoint setup by quirk | Date | Mon, 18 Feb 2019 14:43:51 +0100 |
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4.14-stable review patch. If anyone has any objections, please let me know.
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From: Manuel Reinhardt <manuel.rhdt@gmail.com>
commit 2bc16b9f3223d049b57202ee702fcb5b9b507019 upstream.
The commit a60945fd08e4 ("ALSA: usb-audio: move implicit fb quirks to separate function") introduced an error in the handling of quirks for implicit feedback endpoints. This commit fixes this.
If a quirk successfully sets up an implicit feedback endpoint, usb-audio no longer tries to find the implicit fb endpoint itself.
Fixes: a60945fd08e4 ("ALSA: usb-audio: move implicit fb quirks to separate function") Signed-off-by: Manuel Reinhardt <manuel.rhdt@gmail.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- sound/usb/pcm.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
--- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -313,6 +313,9 @@ static int search_roland_implicit_fb(str return 0; } +/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk + * applies. Returns 1 if a quirk was found. + */ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, struct usb_device *dev, struct usb_interface_descriptor *altsd, @@ -391,7 +394,7 @@ add_sync_ep: subs->data_endpoint->sync_master = subs->sync_endpoint; - return 0; + return 1; } static int set_sync_endpoint(struct snd_usb_substream *subs, @@ -430,6 +433,10 @@ static int set_sync_endpoint(struct snd_ if (err < 0) return err; + /* endpoint set by quirk */ + if (err > 0) + return 0; + if (altsd->bNumEndpoints < 2) return 0;
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