mmc: block: add a block request prepare function
Break out code from mmc_blk_issue_rw_rq to create a block request prepare function. This doesn't change any functionallity. This helps when handling more than one active block request. Signed-off-by: NPer Forlin <per.forlin@linaro.org> Acked-by: NKyungmin Park <kyungmin.park@samsung.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Reviewed-by: NVenkatraman S <svenkatr@ti.com> Tested-by: NSourav Poddar <sourav.poddar@ti.com> Tested-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NChris Ball <cjb@laptop.org>
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