• Rafael J. Wysocki's avatar
    PM: Introduce functions for suspending and resuming device interrupts · 0a0c5168
    Rafael J. Wysocki authored
    Introduce helper functions allowing us to prevent device drivers from
    getting any interrupts (without disabling interrupts on the CPU)
    during suspend (or hibernation) and to make them start to receive
    interrupts again during the subsequent resume.  These functions make it
    possible to keep timer interrupts enabled while the "late" suspend and
    "early" resume callbacks provided by device drivers are being
    executed.  In turn, this allows device drivers' "late" suspend and
    "early" resume callbacks to sleep, execute ACPI callbacks etc.
    
    The functions introduced here will be used to rework the handling of
    interrupts during suspend (hibernation) and resume.  Namely,
    interrupts will only be disabled on the CPU right before suspending
    sysdevs, while device drivers will be prevented from receiving
    interrupts, with the help of the new helper function, before their
    "late" suspend callbacks run (and analogously during resume).
    Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
    Acked-by: default avatarIngo Molnar <mingo@elte.hu>
    0a0c5168
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