linux-kernel - [PATCH] gpiolib: fix unwatch ioctl()

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Date:   Mon, 24 Feb 2020 14:49:53 +0000
From:   Kent Gibson <warthog618@...il.com>
To:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        bgolaszewski@...libre.com, linus.walleij@...aro.org
Cc:     Kent Gibson <warthog618@...il.com>
Subject: [PATCH] gpiolib: fix unwatch ioctl()

Fix the field having a bit cleared by the unwatch ioctl().

Fixes: 51c1064e82e7 ("gpiolib: add new ioctl() for monitoring changes in line info")
Signed-off-by: Kent Gibson <warthog618@...il.com>

---

I had written some tests for v1 of the new ioctl patch series, and just
updated them to run against the v6, which is now in gpio/for-next.

I found the Unwatch ioctl suffered a regression - it simply didn't work
anymore, though it wasn't returning any error.

This patch fixes that regression.

 drivers/gpio/gpiolib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 73a1e0831eeb..2411562a9bac 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1276,7 +1276,7 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		if (IS_ERR(desc))
 			return PTR_ERR(desc);
 
-		clear_bit(desc_to_gpio(desc), &desc->flags);
+		clear_bit(desc_to_gpio(desc), priv->watched_lines);
 		return 0;
 	}
 	return -EINVAL;
-- 
2.25.0