From: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Date: Sun, 23 Sep 2018 23:53:35 +0000 (+0200)
Subject: gpiolib: Fix missing updates of bitmap index
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=35ae7f9694e3c059a9d6a6049c7c171c8233c0c9;p=linux.git

gpiolib: Fix missing updates of bitmap index

In new code introduced by commit b17566a6b08b ("gpiolib: Implement fast
processing path in get/set array"), bitmap index is not updated with
next found zero bit position as it should while skipping over pins
already processed via fast bitmap path, possibly resulting in an
infinite loop.  Fix it.

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index ce7fa2db26a73..aa0b4b46fccc1 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2880,8 +2880,8 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
 			__set_bit(hwgpio, mask);
 
 			if (array_info)
-				find_next_zero_bit(array_info->get_mask,
-						   array_size, i);
+				i = find_next_zero_bit(array_info->get_mask,
+						       array_size, i);
 			else
 				i++;
 		} while ((i < array_size) &&
@@ -2905,7 +2905,8 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
 			trace_gpio_value(desc_to_gpio(desc), 1, value);
 
 			if (array_info)
-				find_next_zero_bit(array_info->get_mask, i, j);
+				j = find_next_zero_bit(array_info->get_mask, i,
+						       j);
 			else
 				j++;
 		}
@@ -3192,8 +3193,8 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
 			}
 
 			if (array_info)
-				find_next_zero_bit(array_info->set_mask,
-						   array_size, i);
+				i = find_next_zero_bit(array_info->set_mask,
+						       array_size, i);
 			else
 				i++;
 		} while ((i < array_size) &&