• Alan Stern's avatar
    USB: unbind all interfaces before rebinding any · 6aec044c
    Alan Stern authored
    When a driver doesn't have pre_reset, post_reset, or reset_resume
    methods, the USB core unbinds that driver when its device undergoes a
    reset or a reset-resume, and then rebinds it afterward.
    
    The existing straightforward implementation can lead to problems,
    because each interface gets unbound and rebound before the next
    interface is handled.  If a driver claims additional interfaces, the
    claim may fail because the old binding instance may still own the
    additional interface when the new instance tries to claim it.
    
    This patch fixes the problem by first unbinding all the interfaces
    that are marked (i.e., their needs_binding flag is set) and then
    rebinding all of them.
    
    The patch also makes the helper functions in driver.c a little more
    uniform and adjusts some out-of-date comments.
    Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
    Reported-and-tested-by: default avatar"Poulain, Loic" <loic.poulain@intel.com>
    Cc: stable <stable@vger.kernel.org>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    6aec044c
driver.c 54.2 KB