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ALSA: hdac_regmap - fix the register access for runtime PM 

Call path:

  1) snd_hdac_power_up_pm()
  2) snd_hdac_power_up()
  3) pm_runtime_get_sync()
  4) __pm_runtime_resume()
  5) rpm_resume()

The rpm_resume() returns 1 when the device is already active.
Because the return value is unmodified, the hdac regmap read/write
functions should allow this value for the retry I/O operation, too.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
steinar/wifi_calib_4_9_kernel
Jaroslav Kysela 2016-06-17 13:35:56 +02:00 committed by Takashi Iwai
parent 35639a0e98
commit 8198868f0a
1 changed files with 2 additions and 2 deletions
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4
sound/hda/hdac_regmap.c
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@ -444,7 +444,7 @@ int snd_hdac_regmap_write_raw(struct hdac_device *codec, unsigned int reg,
err = reg_raw_write(codec, reg, val);
if (err == -EAGAIN) {
err = snd_hdac_power_up_pm(codec);
if (!err)
if (err >= 0)
err = reg_raw_write(codec, reg, val);
snd_hdac_power_down_pm(codec);
}
@ -470,7 +470,7 @@ static int __snd_hdac_regmap_read_raw(struct hdac_device *codec,
err = reg_raw_read(codec, reg, val, uncached);
if (err == -EAGAIN) {
err = snd_hdac_power_up_pm(codec);
if (!err)
if (err >= 0)
err = reg_raw_read(codec, reg, val, uncached);
snd_hdac_power_down_pm(codec);
}