mmc: sh-mmcif: avoid oops on spurious interrupts
On some systems, e.g., kzm9g, MMCIF interfaces can produce spurious interrupts without any active request. To prevent the Oops, that results in such cases, don't dereference the mmc request pointer until we make sure, that we are indeed processing such a request. Reported-by: NTetsuyuki Kobayashi <koba@kmckk.co.jp> Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de> Cc: stable <stable@vger.kernel.org> Signed-off-by: NChris Ball <cjb@laptop.org>
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