Re: [PATCH] acpi: scan: Fix a possible data race in acpi_scan_hotplug_enabled

From: Jia-Ju Bai
Date: Tue May 08 2018 - 23:18:03 EST

On 2018/5/9 4:17, Rafael J. Wysocki wrote:
On Tue, May 8, 2018 at 5:08 AM, Jia-Ju Bai <baijiaju1990@xxxxxxxxx> wrote:
The write operation to "hotplug->enabled" is protected by
the lock on line 1760, but the read operation to
this data on line 1755 is not protected by the lock.
Thus, there may exist a data race for "hotplug->enabled".
Either it does exist, or it doesn't.

If it exists, it needs to be fixed. If it doesn't exist, nothing
needs to be done.

Which is the case?

I only read the code and find this possible data race.
It is not found in real driver execution.
I am not sure of it, so I use "may" and "possible" here.

Best wishes,
Jia-Ju Bai