Date: Wed, 15 Feb 2012 14:30:04 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r231762 - stable/9/sys/dev/sound/pcm Message-ID: <201202151430.q1FEU4D0066077@svn.freebsd.org>
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Author: mav Date: Wed Feb 15 14:30:04 2012 New Revision: 231762 URL: http://svn.freebsd.org/changeset/base/231762 Log: MFC r231647: Do not handle MOD_SHUTDOWN equally to MOD_UNLOAD in sound kernel module. MOD_SHUTDOWN is not an end of existence, and there is a life after it. In particular, code previously called on MOD_SHUTDOWN grabbed lock and deallocated unit numbering. That caused infinite wait loop if snd_uaudio tried to destroy its PCM device after that point. Modified: stable/9/sys/dev/sound/pcm/sound.c Directory Properties: stable/9/sys/ (props changed) Modified: stable/9/sys/dev/sound/pcm/sound.c ============================================================================== --- stable/9/sys/dev/sound/pcm/sound.c Wed Feb 15 14:29:23 2012 (r231761) +++ stable/9/sys/dev/sound/pcm/sound.c Wed Feb 15 14:30:04 2012 (r231762) @@ -1415,7 +1415,6 @@ sound_modevent(module_t mod, int type, v pcmsg_unrhdr = new_unrhdr(1, INT_MAX, NULL); break; case MOD_UNLOAD: - case MOD_SHUTDOWN: ret = sndstat_acquire(curthread); if (ret != 0) break; @@ -1424,6 +1423,8 @@ sound_modevent(module_t mod, int type, v pcmsg_unrhdr = NULL; } break; + case MOD_SHUTDOWN: + break; default: ret = ENOTSUP; }
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