mmc: stop abusing the request queue_lock pointer
mmc uses the block layer struct request pointer to indirect their own lock to the mmc_queue structure, given that the original lock isn't reachable outside of block.c. Add a lock pointer to struct mmc_queue instead and stop overriding the block layer lock which protects fields entirely separate from the mmc use. Reviewed-by: NHannes Reinecke <hare@suse.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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