Revert "blk-throttle: Fix IO hang for a corner case"

This reverts commit 5b7048b.

The main purpose of this patch is cleanup.
The throtl_adjusted_limit function was removed after
commit bf20ab5 ("blk-throttle: remove
CONFIG_BLK_DEV_THROTTLING_LOW"), so the problem of not being
able to scale after setting bps or iops to 1 will not occur.
So revert this commit that bps/iops can be set to 1.

Cc: Baolin Wang <[email protected]>
Cc: Yu Kuai <[email protected]>
Signed-off-by: Xiuhong Wang <[email protected]>
Signed-off-by: Zhiguo Niu <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Reviewed-by: Yu Kuai <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: wangxiuhong134

block/blk-throttle.c

@@ -1485,13 +1485,13 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of,
 			goto out_finish;
 
 		ret = -EINVAL;
-		if (!strcmp(tok, "rbps") && val > 1)
+		if (!strcmp(tok, "rbps"))
 			v[0] = val;
-		else if (!strcmp(tok, "wbps") && val > 1)
+		else if (!strcmp(tok, "wbps"))
 			v[1] = val;
-		else if (!strcmp(tok, "riops") && val > 1)
+		else if (!strcmp(tok, "riops"))
 			v[2] = min_t(u64, val, UINT_MAX);
-		else if (!strcmp(tok, "wiops") && val > 1)
+		else if (!strcmp(tok, "wiops"))
 			v[3] = min_t(u64, val, UINT_MAX);
 		else
 			goto out_finish;