FAILED: patch "[PATCH] iio: tsl2583: Fix division by a zero lux_val" failed to apply to 4.4-stable tree

The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From af0e1871d79cfbb91f732d2c6fa7558e45c31038 Mon Sep 17 00:00:00 2001
From: Colin Ian King <[email protected]>
Date: Fri, 7 May 2021 19:30:41 +0100
Subject: [PATCH] iio: tsl2583: Fix division by a zero lux_val

The lux_val returned from tsl2583_get_lux can potentially be zero, so check for this to avoid a division by zero and an overflowed gain_trim_val.

Fixes clang scan-build warning:

drivers/iio/light/tsl2583.c:345:40: warning: Either the condition 'lux_val<0' is redundant or there is division by zero at line 345. [zerodivcond]

index 0f787bfc88fc..c9d8f07a6fcd 100644
@@ -341,6 +341,14 @@ static int tsl2583_als_calibrate(struct iio_dev *indio_dev)
 		return lux_val;
 	}
 
+	/* Avoid division by zero of lux_value later on */
+	if (lux_val == 0) {
+		dev_err(&chip->client->dev,
+			"%s: lux_val of 0 will produce out of range trim_value\n",
+			__func__);
+		return -ENODATA;
+	}
+
 	gain_trim_val = (unsigned int)(((chip->als_settings.als_cal_target)
 			* chip->als_settings.als_gain_trim) / lux_val);
 	if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {