Date: Thu, 12 Aug 2010 23:45:33 +0200
Message-ID: <s5h4oeztshu.wl%tiwai@suse.de>
From: Takashi Iwai <tiwai@suse.de>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Eric Paris <eparis@redhat.com>, Pekka Enberg <penberg@kernel.org>,
        Thomas Meyer <thomas@m3y3r.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.36: Sound stop working
In-Reply-To: <4C64669B.1020605@gmail.com>
References: <201008122200.05598.thomas@m3y3r.de>
	<AANLkTikZ4wA4jJ0AnWMXYmgWVBShRW=Yu67J0QvebRx0@mail.gmail.com>
	<s5hpqxntw64.wl%tiwai@suse.de>
	<4C646110.1040104@gmail.com>
	<AANLkTi=-2U3PXeUEXzGDdXti_j5yGbfG3yci909MKEHX@mail.gmail.com>
	<4C64669B.1020605@gmail.com>
User-Agent: Wanderlust/2.15.6 (Almost Unreal) SEMI/1.14.6 (Maruoka)
 FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.7 Emacs/23.1
 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO)
MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka")
Content-Type: text/plain; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1290
Lines: 50

At Thu, 12 Aug 2010 23:24:43 +0200,
Jiri Slaby wrote:
> 
> On 08/12/2010 11:18 PM, Linus Torvalds wrote:
> > On Thu, Aug 12, 2010 at 2:01 PM, Jiri Slaby <jirislaby@gmail.com> wrote:
> >> Probably I got into this problem yesterday. Found out that PA fails to
> >> open /dev/snd/pcmC0D0p _second_ time. It opens it, then closes, then
> >> opens it again and gets EBUSY. aplay is OK.
> 
> Perfectly reproducible in qemu-kvm with ac97 soundhw, i.e. intel8x0
> driver. Just in case you want to debug that easily.

And the below is a minimal test case to simulate the situation
PulseAudio does.


Takashi

===

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/inotify.h>
#include <unistd.h>

int main()
{
	int fd;

	inotify_add_watch(inotify_init(), "/dev/snd", IN_CLOSE_WRITE);

	fd = open("/dev/snd/pcmC0D0p", O_RDWR | O_NONBLOCK);
	if (fd < 0)
		perror("open1");
	else
		close(fd);
	fd = open("/dev/snd/pcmC0D0p", O_RDWR | O_NONBLOCK);
	if (fd < 0)
		perror("open2");
	else
		close(fd);
	return 0;
}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/