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If the sigio workaround needed to be applied to a file descriptor, set_irq_wake() wouldn't work for it since it would get polled by the thread instead of causing SIGIO, and thus could never really cause a wakeup, since the thread notification FD wasn't marked as being able to wake up the system. Fix this by marking the thread's notification FD explicitly as a wake source FD, i.e. not suppressing SIGIO for it in suspend. In order to not cause spurious wakeups, we then need to remove all FDs that shouldn't wake up the system from the polling thread. In order to do this, add unlocked versions of ignore_sigio_fd() and add_sigio_fd() (nothing else is happening in suspend, so this is fine), and also modify ignore_sigio_fd() to return -ENOENT if the FD wasn't originally in there. This doesn't matter because nothing else currently checks the return value, but the irq code needs to know which ones to restore the workaround for. All told, this lets us use a timerfd for the RTC clock in the next patch, which doesn't send SIGIO. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at> |
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