• R
    ACPI: Remove the wakeup.run_wake_count device field · 51907267
    Rafael J. Wysocki 提交于
    The wakeup.run_wake_count ACPI device field is only used by the PCI
    runtime PM code to "protect" devices from being prepared for
    generating wakeup signals more than once in a row.  However, it
    really doesn't provide any protection, because (1) all of the
    functions it is supposed to protect use their own reference counters
    effectively ensuring that the device will be set up for generating
    wakeup signals just once and (2) the PCI runtime PM code uses
    wakeup.run_wake_count in a racy way, since nothing prevents
    acpi_dev_run_wake() from being called concurrently from two different
    threads for the same device.
    
    Remove the wakeup.run_wake_count ACPI device field which is
    unnecessary, confusing and used in a wrong way.
    Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
    51907267
button.c 13.2 KB