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mfd: Only unregister platform devices allocated by the mfd core

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commit b9fbb62eb6 upstream.

mfd_remove_devices would iterate over all devices sharing a parent with
an mfd device regardless of whether they were allocated by the mfd core
or not. This especially caused problems when the device structure was
not contained within a platform_device, because to_platform_device is
used on each device pointer.

This patch defines a device_type for mfd devices and checks this is
present from mfd_remove_devices_fn before processing the device.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Tested-by: Peter Tyser <ptyser@xes-inc.com>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Charles Keepax 2012-11-09 16:15:28 +00:00 committed by Greg Kroah-Hartman
parent 4bc4d7ec50
commit af713fb8e7
1 changed files with 13 additions and 2 deletions
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15
drivers/mfd/mfd-core.c
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@ -19,6 +19,10 @@
#include <linux/slab.h>
#include <linux/module.h>
static struct device_type mfd_dev_type = {
.name = "mfd_device",
};
int mfd_cell_enable(struct platform_device *pdev)
{
const struct mfd_cell *cell = mfd_get_cell(pdev);
@ -88,6 +92,7 @@ static int mfd_add_device(struct device *parent, int id,
goto fail_device;
pdev->dev.parent = parent;
pdev->dev.type = &mfd_dev_type;
if (cell->pdata_size) {
ret = platform_device_add_data(pdev,
@ -183,10 +188,16 @@ EXPORT_SYMBOL(mfd_add_devices);
static int mfd_remove_devices_fn(struct device *dev, void *c)
{
struct platform_device *pdev = to_platform_device(dev);
const struct mfd_cell *cell = mfd_get_cell(pdev);
struct platform_device *pdev;
const struct mfd_cell *cell;
atomic_t **usage_count = c;
if (dev->type != &mfd_dev_type)
return 0;
pdev = to_platform_device(dev);
cell = mfd_get_cell(pdev);
/* find the base address of usage_count pointers (for freeing) */
if (!*usage_count || (cell->usage_count < *usage_count))
*usage_count = cell->usage_count;