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authorWu Fengguang <fengguang.wu@intel.com>2009-08-01 18:46:46 +0800
committerTakashi Iwai <tiwai@suse.de>2009-08-03 08:26:23 +0200
commita678cdee25a387c8fc3b2754974695412baf1d85 (patch)
tree77363880dead9748b8072ac31a571be7a9270c5c
parentdeadff1665491afce124a8ff83f00f784161f660 (diff)
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>
-rw-r--r--sound/pci/hda/hda_intel.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 19e67a1b602..ddabc827ac4 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);