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When the gpio-keys device is registered using
platform_device_register_data() the platform data argument,
lager_keys_pdata is duplicated and thus should be marked as __initdata
to avoid wasting memory. However, this is not true of gpio_buttons,
a reference to it rather than its value is duplicated when lager_keys_pdata
is duplicated.
This avoids accessing freed memory if gpio-key events occur
after unused kernel memory is freed late in the kernel's boot.
This but was added when support for gpio-keys was added to lager
in c3842e4fcbb7664276443b79187b7808c2e80a35
("ARM: shmobile: lager: support GPIO switches") which was included
in v3.11-rc1.
Tested-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
a601469386