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H A Draid5-cache.cdiff bb3338d3474e0329918fda9dae2c52751731eb58 Tue May 09 02:39:24 CEST 2017 Song Liu <songliubraving@fb.com> md/raid5-cache: in r5l_do_submit_io(), submit io->split_bio first

In r5l_do_submit_io(), it is necessary to check io->split_bio before
submit io->current_bio. This is because, endio of current_bio may
free the whole IO unit, and thus change io->split_bio.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>