[ALSA] hda-intel - Add barrier
Add proper barriers in the RIRB communication code.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 9a20fb1..557f269 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -536,8 +536,9 @@
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 @@
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)