• Aaron Sierra's avatar
    tty: serial: exar: Relocate sleep wake-up handling · c7e1b405
    Aaron Sierra authored
    Exar sleep wake-up handling has been done on a per-channel basis by
    virtue of INT0 being accessible from each channel's address space. I
    believe this was initially done out of necessity, but now that Exar
    devices have their own driver, we can do things more efficiently by
    registering a dedicated INT0 handler at the PCI device level.
    
    I see this change providing the following benefits:
    
        1. If more than one port is active, eliminates the redundant bus
           cycles for reading INT0 on every interrupt.
        2. This note associated with hooking in the per-channel handler in
           8250_port.c is resolved:
            /* Fixme: probably not the best place for this */
    
    Cc: Matt Schulte <matts@commtech-fastcom.com>
    Signed-off-by: default avatarAaron Sierra <asierra@xes-inc.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    c7e1b405
8250_port.c 81.8 KB