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iio: stmpe-adc: Reinit completion struct on begin conversion 

In some cases, the wait_completion got interrupted. This caused the
error-handling to mutex_unlock the function. The before turned on
interrupt then got called anyway. In the ISR then completion() was
called causing wrong adc-values returned in a following adc-readout.

Reinitialise completion struct to make sure the counter is zero
when beginning a new adc-conversion.

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Philippe Schenker 2019-05-07 16:36:12 +02:00 committed by Jonathan Cameron
parent 2abd293703
commit 263d21cd5e
1 changed files with 4 additions and 0 deletions
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4
drivers/iio/adc/stmpe-adc.c
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@ -65,6 +65,8 @@ static int stmpe_read_voltage(struct stmpe_adc *info,
mutex_lock(&info->lock);
reinit_completion(&info->completion);
info->channel = (u8)chan->channel;
if (info->channel > STMPE_ADC_LAST_NR) {
@ -103,6 +105,8 @@ static int stmpe_read_temp(struct stmpe_adc *info,
mutex_lock(&info->lock);
reinit_completion(&info->completion);
info->channel = (u8)chan->channel;
if (info->channel != STMPE_TEMP_CHANNEL) {