3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Charles Keepax <ckee...@opensource.wolfsonmicro.com>
commit b9fbb62eb61452d728c39b2e5020739c575aac53 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 <ckee...@opensource.wolfsonmicro.com>
Tested-by: Peter Tyser <pty...@xes-inc.com>
Reviewed-by: Mark Brown <broo...@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sa...@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/mfd/mfd-core.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -18,6 +18,10 @@
#include <linux/pm_runtime.h>
#include <linux/slab.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);
@@ -87,6 +91,7 @@ static int mfd_add_device(struct device
goto fail_device;
pdev->dev.parent = parent;
+ pdev->dev.type = &mfd_dev_type;
if (cell->pdata_size) {
ret = platform_device_add_data(pdev,
@@ -182,10 +187,16 @@ 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;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
