driver core: platform: Use drv->driver.bus instead of assuming platform_bus_type
In theory (although not *yet* in practice), a driver being passed to platform_driver_probe might have driver.bus set to something other than platform_bus_type. Locking drv->driver.bus is always correct. Signed-off-by: Patrick Pannuto <ppannuto@codeaurora.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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