linux-kernel - Re: [PATCH] ALSA: usb-audio: Don't refcount multiple accesses on the single clock

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Message-ID: <87czc7ehqp.wl-tiwai@suse.de>
Date:   Wed, 07 Sep 2022 10:00:46 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     alsa-devel@...a-project.org, LKML <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Niklāvs Koļesņikovs 
        <89q1r14hd@...ay.firefox.com>, Wim Taymans <wtaymans@...hat.com>
Subject: Re: [PATCH] ALSA: usb-audio: Don't refcount multiple accesses on the single clock

On Mon, 05 Sep 2022 14:16:39 +0200,
Jason A. Donenfeld wrote:
> 
> On Mon, Sep 5, 2022 at 1:44 PM Takashi Iwai <tiwai@...e.de> wrote:
> > When you load snd-usb-audio with dyndbg=+p option, does it show the
> > new error message "Mismatched sample rate xxx"?
> 
> No.

What about the patch below?


Takashi

-- 8< --
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -925,6 +925,8 @@ void snd_usb_endpoint_close(struct snd_usb_audio *chip,
 		endpoint_set_interface(chip, ep, false);
 
 	if (!--ep->opened) {
+		if (ep->clock_ref && !atomic_read(&ep->clock_ref->locked))
+			ep->clock_ref->rate = 0;
 		ep->iface = 0;
 		ep->altsetting = 0;
 		ep->cur_audiofmt = NULL;