Linux Kernels

gpio: tc3589x: Be sure to clamp return value

This change “gpio: tc3589x: Be sure to clamp return value” (commit 27ca226) in Linux kernel is authored by Linus Walleij <linus.walleij [at] linaro.org> on Mon Dec 21 11:42:30 2015 +0100.

Description of "gpio: tc3589x: Be sure to clamp return value"

The change “gpio: tc3589x: Be sure to clamp return value” introduces changes as follows.

gpio: tc3589x: Be sure to clamp return value

As we want gpio_chip .get() calls to be able to return negative
error codes and propagate to drivers, we need to go over all
drivers and make sure their return values are clamped to [0,1].
We do this by using the ret = !!(val) design pattern.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Linux kernel releases containing commit 27ca226

The Linux kernel releases containing this commit are as follows.

Linux kernel code changes from "gpio: tc3589x: Be sure to clamp return value"

There are 2 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 drivers/gpio/gpio-tc3589x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/gpio/gpio-tc3589x.c b/drivers/gpio/gpio-tc3589x.c
index 7c1537ed6dff..2896aef5aec4 100644
--- a/drivers/gpio/gpio-tc3589x.c
+++ b/drivers/gpio/gpio-tc3589x.c
@@ -51,7 +51,7 @@ static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned offset)
 	if (ret < 0)
 		return ret;
 
-	return ret & mask;
+	return !!(ret & mask);
 }
 
 static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned offset, int val)

The commit for this change in Linux stable tree is 27ca226 (patch).

Last modified: 2020/01/11 09:36