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Replace the wmi_block.read_takes_no_args bool field with an unsigned long flags field, used together with test_bit() and friends. This is a preparation patch for fixing a driver->notify() vs ->probe() race, which requires atomic flag handling. Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20211128190031.405620-1-hdegoede@redhat.com