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[ALSA] hda-intel - Add barrier 

Add proper barriers in the RIRB communication code.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2008-03-18 09:47:06 +01:00
parent 86d34b7ec8
commit 2add9b9253
1 changed files with 5 additions and 2 deletions
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7
sound/pci/hda/hda_intel.c
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@ -536,8 +536,9 @@ static void azx_update_rirb(struct azx *chip)
if (res_ex & ICH6_RIRB_EX_UNSOL_EV) if (res_ex & ICH6_RIRB_EX_UNSOL_EV)
snd_hda_queue_unsol_event(chip->bus, res, res_ex); snd_hda_queue_unsol_event(chip->bus, res, res_ex);
else if (chip->rirb.cmds) { else if (chip->rirb.cmds) {
chip->rirb.cmds--;
chip->rirb.res = res; 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); azx_update_rirb(chip);
spin_unlock_irq(&chip->reg_lock); spin_unlock_irq(&chip->reg_lock);
} }
if (!chip->rirb.cmds) if (!chip->rirb.cmds) {
smp_rmb();
return chip->rirb.res; /* the last value */ return chip->rirb.res; /* the last value */
}
if (time_after(jiffies, timeout)) if (time_after(jiffies, timeout))
break; break;
if (codec->bus->needs_damn_long_delay) if (codec->bus->needs_damn_long_delay)