Patch "gpiolib: don't allow OPEN_DRAIN & OPEN_SOURCE flags simultaneously" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

gpiolib: don't allow OPEN_DRAIN & OPEN_SOURCE flags simultaneously

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
gpiolib-don-t-allow-open_drain-open_source-flags-simultaneously.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Bartosz Golaszewski <[email protected]>
Date: Wed, 15 Nov 2017 16:47:43 +0100
Subject: gpiolib: don't allow OPEN_DRAIN & OPEN_SOURCE flags simultaneously

From: Bartosz Golaszewski <[email protected]>

[ Upstream commit 588fc3bceaf81bbd62e18af6f7bd475e01c2b7e8 ]

Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If the hardware actually supports enabling both at the same time the electrical result would be disastrous.

---
 drivers/gpio/gpiolib.c |    9 +++++++++
 1 file changed, 9 insertions(+)

@@ -460,6 +460,15 @@ static int linehandle_create(struct gpio
 	if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS)
 		return -EINVAL;
 
+	/*
+	 * Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If
+	 * the hardware actually supports enabling both at the same time the
+	 * electrical result would be disastrous.
+	 */
+	if ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) &&
+	    (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))
+		return -EINVAL;
+
 	/* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */
 	if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) &&
 	    ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/gpiolib-don-t-allow-open_drain-open_source-flags-simultaneously.patch