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bfq-iosched: don't worry about reserved tags in limit_depth 

Reserved tags are used for error handling, we don't need to
care about them for regular IO. The core won't call us for these
anyway.

Acked-by: Paolo Valente <paolo.valente@linaro.org>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Jens Axboe 2018-05-09 13:12:10 -06:00
parent 17a5119932
commit 55141366de
1 changed files with 1 additions and 8 deletions
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9
block/bfq-iosched.c
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@ -542,14 +542,7 @@ static void bfq_limit_depth(unsigned int op, struct blk_mq_alloc_data *data)
if (op_is_sync(op) && !op_is_write(op))
return;
if (data->flags & BLK_MQ_REQ_RESERVED) {
if (unlikely(!tags->nr_reserved_tags)) {
WARN_ON_ONCE(1);
return;
}
bt = &tags->breserved_tags;
} else
bt = &tags->bitmap_tags;
bt = &tags->bitmap_tags;
if (unlikely(bfqd->sb_shift != bt->sb.shift))
bfq_update_depths(bfqd, bt);