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Code Issues Releases Activity

sound: Add missing CHN_[UN]LOCKs in sndstat

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In sndstat_build_sound4_nvlist(), if we have INVARIANTS or
SND_DIAGNOSTIC enabled, we will hit a lock assertion panic when we call
CHN_GETVOLUME(). Also lock the channel in the sndstat_prepare_pcm() loop
for good measure.

Fixes:		bbca3a75bb ("sound: Include sound(4) channel information in sndstat nvlist")
Sponsored by:	The FreeBSD Foundation
MFC after:	2 days
Reviewed by:	dev_submerge.ch
Differential Revision:	https://reviews.freebsd.org/D45898
This commit is contained in:
Christos Margiolis 2024-07-06 20:23:22 +02:00
parent 1a768ea9db
commit e850bd36df
1 changed files with 8 additions and 0 deletions
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8
sys/dev/sound/pcm/sndstat.c
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@ -456,6 +456,8 @@ sndstat_build_sound4_nvlist(struct snddev_info *d, nvlist_t **dip)
goto done;
}
CHN_LOCK(c);
nvlist_add_string(cdi, SNDST_DSPS_SOUND4_CHAN_NAME, c->name);
nvlist_add_string(cdi, SNDST_DSPS_SOUND4_CHAN_PARENTCHAN,
c->parentchannel != NULL ? c->parentchannel->name : "");
@ -537,6 +539,8 @@ sndstat_build_sound4_nvlist(struct snddev_info *d, nvlist_t **dip)
sbuf_printf(&sb, "%s]",
(c->direction == PCMDIR_REC) ? "userland" : "hardware");
CHN_UNLOCK(c);
sbuf_finish(&sb);
nvlist_add_string(cdi, SNDST_DSPS_SOUND4_CHAN_FEEDERCHAIN,
sbuf_data(&sb));
@ -1230,6 +1234,8 @@ sndstat_prepare_pcm(struct sbuf *s, device_t dev, int verbose)
KASSERT(c->bufhard != NULL && c->bufsoft != NULL,
("hosed pcm channel setup"));
CHN_LOCK(c);
sbuf_printf(s, "\n\t");
sbuf_printf(s, "%s[%s]: ",
@ -1321,6 +1327,8 @@ sndstat_prepare_pcm(struct sbuf *s, device_t dev, int verbose)
}
sbuf_printf(s, "{%s}",
(c->direction == PCMDIR_REC) ? "userland" : "hardware");
CHN_UNLOCK(c);
}
return (0);