[PATCH 4.9 043/310] iio: pressure: zpa2326: report interrupted case as failure

From: Greg Kroah-Hartman
Date: Wed Apr 11 2018 - 16:11:13 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Nicholas Mc Guire <der.herr@xxxxxxx>


[ Upstream commit e7215fe4d51e69c9d2608ad0c409d48e844d0adc ]

If the timeout-case prints a warning message then probably the interrupted
case should also. Further, wait_for_completion_interruptible_timeout()
returns long not int.

Fixes: commit 03b262f2bbf4 ("iio:pressure: initial zpa2326 barometer support")
Signed-off-by: Nicholas Mc Guire <der.herr@xxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/pressure/zpa2326.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)

--- a/drivers/iio/pressure/zpa2326.c
+++ b/drivers/iio/pressure/zpa2326.c
@@ -871,12 +871,13 @@ static int zpa2326_wait_oneshot_completi
{
int ret;
unsigned int val;
+ long timeout;

zpa2326_dbg(indio_dev, "waiting for one shot completion interrupt");

- ret = wait_for_completion_interruptible_timeout(
+ timeout = wait_for_completion_interruptible_timeout(
&private->data_ready, ZPA2326_CONVERSION_JIFFIES);
- if (ret > 0)
+ if (timeout > 0)
/*
* Interrupt handler completed before timeout: return operation
* status.
@@ -886,13 +887,16 @@ static int zpa2326_wait_oneshot_completi
/* Clear all interrupts just to be sure. */
regmap_read(private->regmap, ZPA2326_INT_SOURCE_REG, &val);

- if (!ret)
+ if (!timeout) {
/* Timed out. */
+ zpa2326_warn(indio_dev, "no one shot interrupt occurred (%ld)",
+ timeout);
ret = -ETIME;
-
- if (ret != -ERESTARTSYS)
- zpa2326_warn(indio_dev, "no one shot interrupt occurred (%d)",
- ret);
+ } else if (timeout < 0) {
+ zpa2326_warn(indio_dev,
+ "wait for one shot interrupt cancelled");
+ ret = -ERESTARTSYS;
+ }

return ret;
}