• Alan Stern's avatar
    USB: don't explicitly reenable root-hub status interrupts · e8721549
    Alan Stern authored
    
    
    This patch (as1069b) changes the way OHCI root-hub status-change
    interrupts are enabled.  Currently a special HCD method,
    hub_irq_enable(), is called when the hub driver is finished using a
    root hub.  This approach turns out to be subject to races, resulting
    in unnecessary polling.
    
    The patch does away with the method entirely.  Instead, the driver
    automatically enables the RHSC interrupt when no more status changes
    are present.  This scheme is safe with controllers using
    level-triggered semantics for their interrupt flags.
    Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    e8721549
hub.c 90.4 KB