blktrace: remove unnessary stop block trace in 'blk_trace_shutdown'

mainline inclusion
from mainline-v6.1-rc2
commit 2db96217
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5ZI04
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.1-rc3&id=2db96217e7e515071726ca4ec791742c4202a1b2

--------------------------------

As previous commit, 'blk_trace_cleanup' will stop block trace if
block trace's state is 'Blktrace_running'.
So remove unnessary stop block trace in 'blk_trace_shutdown'.
Signed-off-by: NYe Bin <yebin10@huawei.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221019033602.752383-4-yebin@huaweicloud.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

conflicts:
kernel/trace/blktrace.c
Signed-off-by: NYe Bin <yebin10@huawei.com>
Reviewed-by: NJason Yan <yanaijie@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

kernel/trace/blktrace.c

@@ -775,10 +775,8 @@ void blk_trace_shutdown(struct request_queue *q)
 {
 	mutex_lock(&q->debugfs_mutex);
 	if (rcu_dereference_protected(q->blk_trace,
-				      lockdep_is_held(&q->debugfs_mutex))) {
-		__blk_trace_startstop(q, 0);
+				      lockdep_is_held(&q->debugfs_mutex)))
 		__blk_trace_remove(q);
-	}
 
 	mutex_unlock(&q->debugfs_mutex);
 }