This patch solves kernel deadlock issue seen on JFFF2 simultaneous 
operations. Detailed investigation of the issue showed that the kernel 
deadlock is caused by tons of recursive get_chip calls.
Signed-off-by: NAlexey Korolev <akorolev@infradead.org>
Acked-by: NNicolas Pitre <nico@cam.org>
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>