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mfd: core: Fix platform-device name collisions

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Since commit 6e3f62f079 ("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: 6e3f62f079 ("mfd: core: Fix platform-device id generation")
Cc: stable <stable@vger.kernel.org>	# v3.19
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>
This commit is contained in:
Johan Hovold 2015-03-25 12:07:05 +01:00 committed by Lee Jones
parent bafc1face2
commit a77c50b44c
1 changed files with 1 additions and 1 deletions
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2
drivers/mfd/mfd-core.c
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@ -128,7 +128,7 @@ static int mfd_add_device(struct device *parent, int id,
int platform_id;
int r;
if (id < 0)
if (id == PLATFORM_DEVID_AUTO)
platform_id = id;
else
platform_id = id + cell->id;