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iio: adc: mcp3422: fix locking on error path 

Reading from the chip should be unlocked on error path else the lock
could never being released.

Fixes: 07914c84ba ("iio: adc: Add driver for Microchip MCP3422/3/4 high resolution ADC")
Fixes: 3f1093d83d ("iio: adc: mcp3422: fix locking scope")
Acked-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Link: https://lore.kernel.org/r/20200901093218.1500845-1-angelo.compagnucci@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Angelo Compagnucci 2020-09-01 11:32:18 +02:00 committed by Greg Kroah-Hartman
parent c96711e138
commit a139ffa40f
1 changed files with 3 additions and 1 deletions
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4
drivers/iio/adc/mcp3422.c
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@ -143,8 +143,10 @@ static int mcp3422_read_channel(struct mcp3422 *adc,
config &= ~MCP3422_PGA_MASK;
config |= MCP3422_PGA_VALUE(adc->pga[req_channel]);
ret = mcp3422_update_config(adc, config);
if (ret < 0)
if (ret < 0) {
mutex_unlock(&adc->lock);
return ret;
}
msleep(mcp3422_read_times[MCP3422_SAMPLE_RATE(adc->config)]);
}