devres: allow adding custom actions to the stack
Sometimes drivers need to execute one-off actions in their error handling or device teardown paths. An example would be toggling a GPIO line to reset the controlled device into predefined state. To allow performing such actions when using managed resources let's allow adding them to stack/group of devres resources. Acked-by: NTejun Heo <tj@kernel.org> Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
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