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| author | Wu Fengguang <fengguang.wu@intel.com> | 2009-08-01 18:46:46 +0800 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-08-03 08:26:23 +0200 |
| commit | a678cdee25a387c8fc3b2754974695412baf1d85 (patch) | |
| tree | 77363880dead9748b8072ac31a571be7a9270c5c /sound/pci/hda/hda_intel.c | |
| parent | deadff1665491afce124a8ff83f00f784161f660 (diff) | |
| download | lwn-a678cdee25a387c8fc3b2754974695412baf1d85.tar.gz lwn-a678cdee25a387c8fc3b2754974695412baf1d85.zip | |
ALSA: hda: take cmd_mutex in probe_codec()
Now that each codec will have its own module, it is possible
for the user to load one codec while another one is running.
So cmd_mutex would be a safe addition to probe_codec().
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/hda/hda_intel.c')
| -rw-r--r-- | sound/pci/hda/hda_intel.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 19e67a1b6026..ddabc827ac44 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -1275,10 +1275,12 @@ static int probe_codec(struct azx *chip, int addr) (AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID; unsigned int res; + mutex_lock(&chip->bus->cmd_mutex); chip->probing = 1; azx_send_cmd(chip->bus, cmd); res = azx_get_response(chip->bus, addr); chip->probing = 0; + mutex_unlock(&chip->bus->cmd_mutex); if (res == -1) return -EIO; snd_printdd(SFX "codec #%d probed OK\n", addr); |