The original implementation of dequeuing a request in progress
is not correct.  Change to use a correct process and also clean
up the related functions a little bit.
Signed-off-by: NLi Yang <leoli@freescale.com>
Acked-by: NPeter Chen <peter.chen@freescale.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>