Re: [BUGFIX v2 2/4] ACPI, DOCK: resolve possible deadlock scenarios

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Saturday, June 15, 2013 11:20:40 PM Rafael J. Wysocki wrote:
> On Saturday, June 15, 2013 10:17:42 PM Rafael J. Wysocki wrote:

[...]

> 
> Which sysfs interfaces do you mean, by the way?
> 
> If you mean "eject", then it takes acpi_scan_lock and hotplug_dock_devices()
> should always be run under acpi_scan_lock too.  It isn't at the moment,
> because write_undock() doesn't take acpi_scan_lock(), but this is an obvious
> bug (so I'm going to send a patch to fix it in a while).
> 
> With that bug fixed, the possible race between acpi_eject_store() and
> hotplug_dock_devices() should be prevented from happening, so perhaps we're
> worrying about something that cannot happen?

So here's a question: What particular races are possible if we remove
ds->hp_lock entirely without doing anything else just yet?  I mean, how to
*trigger* them from the start to the end and not how they can possibly happen
but never do, because there's no way they can be actually triggered?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux IBM ACPI]     [Linux Power Management]     [Linux Kernel]     [Linux Laptop]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux