Revert "md/raid5: limit request size according to implementation limits"

This reverts commit e8d7c332.

Now that raid5 doesn't abuse bi_phys_segments any more, we no longer
need to impose these limits.
Signed-off-by: NNeilBrown <neilb@suse.com>
Signed-off-by: NShaohua Li <shli@fb.com>

drivers/md/raid5.c

@@ -7361,15 +7361,6 @@ static int raid5_run(struct mddev *mddev)
 			stripe = (stripe | (stripe-1)) + 1;
 		mddev->queue->limits.discard_alignment = stripe;
 		mddev->queue->limits.discard_granularity = stripe;
-
-		/*
-		 * We use 16-bit counter of active stripes in bi_phys_segments
-		 * (minus one for over-loaded initialization)
-		 */
-		blk_queue_max_hw_sectors(mddev->queue, 0xfffe * STRIPE_SECTORS);
-		blk_queue_max_discard_sectors(mddev->queue,
-					      0xfffe * STRIPE_SECTORS);
-
 		/*
 		 * unaligned part of discard request will be ignored, so can't
 		 * guarantee discard_zeroes_data