platform: Define platform_device_put cleanup handler

Define a cleanup helper for use with __free to destroy platform devices
automatically when the pointer goes out of scope. This is only intended to
be used in error cases and so should be used with return_ptr() or
no_free_ptr() directly to avoid the automatic destruction on success.

A first use of this is introduced in a subsequent commit.

Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com>
Tested-by: Gavin Shan <gshan@redhat.com>
Tested-by: Zeng Heng <zengheng4@huawei.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 074754c23d330c9a099e20eecfeb6cbd5025e04f..23a30ada2d4cfa02cbd4ca3b3bca1fb906b8aa82 100644 (file)
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -232,6 +232,7 @@ extern int platform_device_add_data(struct platform_device *pdev,
 extern int platform_device_add(struct platform_device *pdev);
 extern void platform_device_del(struct platform_device *pdev);
 extern void platform_device_put(struct platform_device *pdev);
+DEFINE_FREE(platform_device_put, struct platform_device *, if (_T) platform_device_put(_T))
 
 struct platform_driver {
        int (*probe)(struct platform_device *);