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authorTakashi Iwai <tiwai@suse.de>2008-03-18 09:47:06 +0100
committerTakashi Iwai <tiwai@suse.de>2008-04-24 12:00:26 +0200
commit2add9b925394746eff692ff0875d21ea2d5289e2 (patch)
tree4ce428c5fec4e471726024c4de733c437315276a /sound/pci
parent86d34b7ec878ea4b4c9f33ce92f1722c4326dbe7 (diff)
[ALSA] hda-intel - Add barrier
Add proper barriers in the RIRB communication code. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci')
-rw-r--r--sound/pci/hda/hda_intel.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 9a20fb1bef4..557f269f83a 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -536,8 +536,9 @@ static void azx_update_rirb(struct azx *chip)
if (res_ex & ICH6_RIRB_EX_UNSOL_EV)
snd_hda_queue_unsol_event(chip->bus, res, res_ex);
else if (chip->rirb.cmds) {
- chip->rirb.cmds--;
chip->rirb.res = res;
+ smp_wmb();
+ chip->rirb.cmds--;
}
}
}
@@ -556,8 +557,10 @@ static unsigned int azx_rirb_get_response(struct hda_codec *codec)
azx_update_rirb(chip);
spin_unlock_irq(&chip->reg_lock);
}
- if (!chip->rirb.cmds)
+ if (!chip->rirb.cmds) {
+ smp_rmb();
return chip->rirb.res; /* the last value */
+ }
if (time_after(jiffies, timeout))
break;
if (codec->bus->needs_damn_long_delay)