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extcon: arizona: Fix race with microphone detection and removal

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The microphone detection code is run as delayed work to provide
additional debounce, it is possible that the jack could have been
removed by the time we process the microphone detection. Turn this
case into a no op.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Charles Keepax 2013-11-14 16:18:23 +00:00 committed by Chanwoo Choi
parent a3e00d4bd8
commit 31a847e6e1
1 changed files with 13 additions and 0 deletions
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13
drivers/extcon/extcon-arizona.c
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@ -780,6 +780,19 @@ static void arizona_micd_detect(struct work_struct *work)
mutex_lock(&info->lock);
/* If the cable was removed while measuring ignore the result */
ret = extcon_get_cable_state_(&info->edev, ARIZONA_CABLE_MECHANICAL);
if (ret < 0) {
dev_err(arizona->dev, "Failed to check cable state: %d\n",
ret);
mutex_unlock(&info->lock);
return;
} else if (!ret) {
dev_dbg(arizona->dev, "Ignoring MICDET for removed cable\n");
mutex_unlock(&info->lock);
return;
}
for (i = 0; i < 10 && !(val & MICD_LVL_0_TO_8); i++) {
ret = regmap_read(arizona->regmap, ARIZONA_MIC_DETECT_3, &val);
if (ret != 0) {