Patch "mfd: core: Fix platform-device name collisions" has been added to the 3.19-stable tree

Patch "mfd: core: Fix platform-device name collisions" has been added to the 3.19-stable tree

[gregkh]

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

    mfd: core: Fix platform-device name collisions

to the 3.19-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:
     mfd-core-fix-platform-device-name-collisions.patch
and it can be found in the queue-3.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From a77c50b44cfb663ad03faba9800fec19bdf83577 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Wed, 25 Mar 2015 12:07:05 +0100
Subject: mfd: core: Fix platform-device name collisions

From: Johan Hovold <johan@kernel.org>

commit a77c50b44cfb663ad03faba9800fec19bdf83577 upstream.

Since commit 6e3f62f0793e ("mfd: core: Fix platform-device id
generation") we honour PLATFORM_DEVID_AUTO and PLATFORM_DEVID_NONE when
registering mfd-devices.

Unfortunately, some mfd-drivers rely on the old behaviour of generating
platform-device ids by adding the cell id also to the special value of
PLATFORM_DEVID_NONE. The resulting platform ids are not only used to
generate device-unique names, but are also used instead of the cell id
to identify cells when probing subdevices.

These drivers should be updated to use PLATFORM_DEVID_AUTO, which would
also allow more than one device to be registered without resorting to
hacks (see for example wm831x), but lets fix the regression first by
partially reverting the above mentioned commit with respect to
PLATFORM_DEVID_NONE.

Fixes: 6e3f62f0793e ("mfd: core: Fix platform-device id generation")
Reported-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -128,7 +128,7 @@ static int mfd_add_device(struct device
 	int platform_id;
 	int r;
 
-	if (id < 0)
+	if (id == PLATFORM_DEVID_AUTO)
 		platform_id = id;
 	else
 		platform_id = id + cell->id;


Patches currently in stable-queue which might be from johan@kernel.org are

queue-3.19/mfd-core-fix-platform-device-name-collisions.patch
queue-3.19/arm-at91-dt-sama5d3-xplained-add-phy-address-for-macb1.patch