On 08/18/2017 02:07 PM, Bart Van Assche wrote:

On Fri, 2017-08-18 at 13:54 -0400, Waiman Long wrote:

quoted

Instead, a global blktrace
mutex will be used to serialize the read/write of the blktrace sysfs
attributes.

Hello Waiman,

Using a mutex to serialize code is wrong. What is needed is exact
documentation of what data structures and/or member variables are
protected by bdev->bd_mutex and by blktrace_mutex.

Yes, I missed the blk_trace_ioctl(). I should have modified it to use
blktrace_mutex as well.

Also, please spell "potential" correctly in the subject of this patch.

Will do.

Thanks,
Longman