ALSA: HDA: Lessen CPU usage when waiting for chip to respond

When an IRQ for some reason gets lost, we wait up to a second using
udelay, which is CPU intensive. This patch improves the situation by
waiting about 30 ms in the CPU intensive mode, then stepping down to
using msleep(2) instead. In essence, we trade some granularity in
exchange for less CPU consumption when the waiting time is a bit longer.

As a result, PulseAudio should no longer be killed by the kernel
for taking up to much RT-prio CPU time. At least not for *this* reason.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Tested-by: Arun Raghavan <arun.raghavan@collabora.co.uk>
Cc: <stable@kernel.org>
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 6e958bf941915f3c2b8cb744e12a74a47896cfdf..1f350522bed436812b794c2544f39674ec4a868d 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -783,11 +783,13 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus,
 {
        struct azx *chip = bus->private_data;
        unsigned long timeout;
+       unsigned long loopcounter;
        int do_poll = 0;
 
  again:
        timeout = jiffies + msecs_to_jiffies(1000);
-       for (;;) {
+
+       for (loopcounter = 0;; loopcounter++) {
                if (chip->polling_mode || do_poll) {
                        spin_lock_irq(&chip->reg_lock);
                        azx_update_rirb(chip);
@@ -803,7 +805,7 @@ static unsigned int azx_rirb_get_response(struct hda_bus *bus,
                }
                if (time_after(jiffies, timeout))
                        break;
-               if (bus->needs_damn_long_delay)
+               if (bus->needs_damn_long_delay || loopcounter > 3000)
                        msleep(2); /* temporary workaround */
                else {
                        udelay(10);