ALSA: hda - Check CORB overflow

Add an overflow check of CORB in HD-audio controller and codec drivers
so that flood of sequential writes would work properly.
In the controller side, add a check of CORB read-pointer to make
returning -EAGAIN when it's full.  Meanwhile in the codec side, when
-EAGAIN error is received, it retries the write after flushing the
pending verbs (calling get_response() essentially does it).

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 9 insertions, 2 deletions

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 0b6aebacc56b..0430436b003d 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -797,7 +797,7 @@ static int azx_corb_send_cmd(struct hda_bus *bus, u32 val)
 {
 	struct azx *chip = bus->private_data;
 	unsigned int addr = azx_command_addr(val);
-	unsigned int wp;
+	unsigned int wp, rp;
 
 	spin_lock_irq(&chip->reg_lock);
 
@@ -806,11 +806,18 @@ static int azx_corb_send_cmd(struct hda_bus *bus, u32 val)
 	if (wp == 0xffff) {
 		/* something wrong, controller likely turned to D3 */
 		spin_unlock_irq(&chip->reg_lock);
-		return -1;
+		return -EIO;
 	}
 	wp++;
 	wp %= ICH6_MAX_CORB_ENTRIES;
 
+	rp = azx_readw(chip, CORBRP);
+	if (wp == rp) {
+		/* oops, it's full */
+		spin_unlock_irq(&chip->reg_lock);
+		return -EAGAIN;
+	}
+
 	chip->rirb.cmds[addr]++;
 	chip->corb.buf[wp] = cpu_to_le32(val);
 	azx_writel(chip, CORBWP, wp);