linux-kernel - Re: [PATCH] acpi: scan: Fix a possible data race in acpi_scan_hotplug

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Message-ID: <CAJZ5v0jqW0yuSOSrgy1=dWARPHmaxtG4fvkZj=pX+fPcTTJh1A@mail.gmail.com>
Date:   Tue, 8 May 2018 22:17:04 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] acpi: scan: Fix a possible data race in acpi_scan_hotplug_enabled

On Tue, May 8, 2018 at 5:08 AM, Jia-Ju Bai <baijiaju1990@...il.com> 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?