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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Jiri Valek - 2N <valek@2n.cz>,
        Stable@vger.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: [PATCH 4.19 29/50] iio: light: opt3001: Fixed timeout error when 0 lux
Date:   Mon, 18 Oct 2021 15:24:36 +0200
Message-Id: <20211018132327.502221865@linuxfoundation.org>
In-Reply-To: <20211018132326.529486647@linuxfoundation.org>
References: <20211018132326.529486647@linuxfoundation.org>
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From: Jiri Valek - 2N <valek@2n.cz>

commit 26d90b5590579def54382a2fc34cfbe8518a9851 upstream.

Reading from sensor returned timeout error under
zero light conditions.

Signed-off-by: Jiri Valek - 2N <valek@2n.cz>
Fixes: ac663db3678a ("iio: light: opt3001: enable operation w/o IRQ")
Link: https://lore.kernel.org/r/20210920125351.6569-1-valek@2n.cz
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/iio/light/opt3001.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/iio/light/opt3001.c
+++ b/drivers/iio/light/opt3001.c
@@ -283,6 +283,8 @@ static int opt3001_get_lux(struct opt300
 		ret = wait_event_timeout(opt->result_ready_queue,
 				opt->result_ready,
 				msecs_to_jiffies(OPT3001_RESULT_READY_LONG));
+		if (ret == 0)
+			return -ETIMEDOUT;
 	} else {
 		/* Sleep for result ready time */
 		timeout = (opt->int_time == OPT3001_INT_TIME_SHORT) ?
@@ -319,9 +321,7 @@ err:
 		/* Disallow IRQ to access the device while lock is active */
 		opt->ok_to_ignore_lock = false;
 
-	if (ret == 0)
-		return -ETIMEDOUT;
-	else if (ret < 0)
+	if (ret < 0)
 		return ret;
 
 	if (opt->use_irq) {