lkml.org 
[lkml]   [2007]   [Feb]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/3] net/bridge/br_if.c: don't use _WORK_NAR
On 02/19, David Howells wrote:
>
> Hmmm... You've got a work_struct (well, a delayed_work actually) - can you
> just punt the destruction of the object over to keventd to perform, I wonder?

Yes, this is close (I think) to what I suggested, see below,

> The big problem with that that I see is that the workqueue facility has no
> guards in place against a work_struct's handler function running on several
> CPUs at once in response to the same work_struct.

Yes. And for this problem WORK_STRUCT_NOAUTOREL does help, but not so much.
It can prevent re-scheduling of the same work, but only if work->func() did
not do work_release() yet.

> > I think the fix should be so that port_carrier_check() does get/put on
> > "struct net_bridge_port" (container), but not on "struct net_device", and
>
> I'm not sure how this helps. You still have to get rid of the net_device at
> some point.

Yes, destroy_nbp() does dev_put(dev). del_nbp() sets dev->br_port = NULL,
port_carrier_check() goes to "done" in that case. So everething looks safe
to me (but again, I do not even know what the "bridge" is :), so we should
only take care about container, nothing more.

I'll try to make a patch for illustration on evening.

Oleg.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-02-19 15:55    [W:0.057 / U:0.656 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site