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: NSong Liu <songliubraving@fb.com> Signed-off-by: NShaohua Li <shli@fb.com>
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