• Alan Stern's avatar
    USB: re-enable interface after driver unbinds · 2caf7fcd
    Alan Stern authored
    This patch (as1197) fixes an error introduced recently.  Since a
    significant number of devices can't handle Set-Interface requests, we
    no longer call usb_set_interface() when a driver unbinds from an
    interface, provided the interface is already in altsetting 0.  However
    the interface still does get disabled, and the call to
    usb_set_interface() was the only thing re-enabling it.  Since the
    interface doesn't get re-enabled, further attempts to use it fail.
    
    So the patch adds a call to usb_enable_interface() when a driver
    unbinds and the interface is in altsetting 0.  For this to work
    right, the interface's endpoints have to be re-enabled but their
    toggles have to be left alone.  Therefore an additional argument is
    added to usb_enable_endpoint() and usb_enable_interface(), a flag
    indicating whether or not the endpoint toggles should be reset.
    
    This is a forward-ported version of a patch which fixes Bugzilla
    #12301.
    Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
    Reported-by: default avatarDavid Roka <roka@dawid.hu>
    Reported-by: default avatarErik Ekman <erik@kryo.se>
    Tested-by: default avatarErik Ekman <erik@kryo.se>
    Tested-by: default avatarAlon Bar-Lev <alon.barlev@gmail.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    2caf7fcd
usb.h 5.05 KB