diff options
Diffstat (limited to 'kernel/trace/blktrace.c')
| -rw-r--r-- | kernel/trace/blktrace.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 77bf690cbacb..55257a3763f9 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -1720,6 +1720,10 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev, mutex_lock(&bdev->bd_mutex); if (attr == &dev_attr_enable) { + if (!!value == !!q->blk_trace) { + ret = 0; + goto out_unlock_bdev; + } if (value) ret = blk_trace_setup_queue(q, bdev); else |