linux-kernel - [PATCH AUTOSEL for 4.9 044/281] iio: pressure: zpa2326: report interrupted case as failure

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Date:   Mon, 19 Mar 2018 15:58:42 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Nicholas Mc Guire <der.herr@...r.at>,
        Jonathan Cameron <jic23@...nel.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 044/281] iio: pressure: zpa2326: report
 interrupted case as failure

From: Nicholas Mc Guire <der.herr@...r.at>

[ 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@...r.at>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/iio/pressure/zpa2326.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/pressure/zpa2326.c b/drivers/iio/pressure/zpa2326.c
index 19d2eb46fda6..2a4a62ebfd8d 100644
--- a/drivers/iio/pressure/zpa2326.c
+++ b/drivers/iio/pressure/zpa2326.c
@@ -871,12 +871,13 @@ static int zpa2326_wait_oneshot_completion(const struct iio_dev   *indio_dev,
 {
 	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_completion(const struct iio_dev   *indio_dev,
 	/* 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;
 }
-- 
2.14.1