From: Bob Copeland <me@bobcopeland.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Henning Rogge <hrogge@gmail.com>,
linux-wireless@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
Henning Rogge <henning.rogge@fkie.fraunhofer.de>
Subject: Re: [PATCH 1/2] mac80211: Remove connected MPP table entries with MPath
Date: Tue, 26 Jan 2016 16:22:21 -0500 [thread overview]
Message-ID: <20160126212221.GA5710@localhost> (raw)
In-Reply-To: <1453841613.2759.77.camel@sipsolutions.net>
On Tue, Jan 26, 2016 at 09:53:33PM +0100, Johannes Berg wrote:
> Oh. Interesting. Yeah, I guess that should be OK then.
>
> It's not *nice*, since that's pretty much unexpected, and you then do
> need the rcu_read_lock() ... hmm.
Yeah, I puzzled over that a bit last week as well -- I rewrote it like
this in the series I haven't posted yet:
void mesh_path_flush_by_nexthop(struct sta_info *sta)
{
[...]
rhashtable_walk_start(&iter);
while ((mpath = rhashtable_walk_next(&iter))) {
if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
continue;
if (IS_ERR(mpath))
break;
if (rcu_access_pointer(mpath->next_hop) == sta)
__mesh_path_del(tbl, mpath);
}
rhashtable_walk_stop(&iter);
[...]
}
...this still relies on the rcu read lock inside _walk_start and _walk_stop,
though.
--
Bob Copeland %% http://bobcopeland.com/
next prev parent reply other threads:[~2016-01-26 21:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-19 8:04 [PATCH 0/2] mac80211: add cleanup path for MPP table entries Henning Rogge
2016-01-19 8:04 ` [PATCH 1/2] mac80211: Remove connected MPP table entries with MPath Henning Rogge
2016-01-26 11:41 ` Johannes Berg
2016-01-26 18:36 ` Bob Copeland
2016-01-26 19:04 ` Henning Rogge
2016-01-26 20:53 ` Johannes Berg
2016-01-26 21:22 ` Bob Copeland [this message]
2016-01-26 21:31 ` Johannes Berg
2016-01-26 21:32 ` Johannes Berg
2016-01-26 21:44 ` Bob Copeland
2016-01-19 8:04 ` [PATCH 2/2] mac80211: let unused MPP table entries timeout Henning Rogge
2016-01-22 20:30 ` Bob Copeland
2016-01-23 9:39 ` Henning Rogge
2016-01-23 15:15 ` Bob Copeland
2016-01-24 17:53 ` Henning Rogge
2016-01-26 11:44 ` Johannes Berg
2016-01-26 19:54 ` Henning Rogge
2016-01-26 23:17 ` Bob Copeland
2016-01-28 13:44 ` [PATCH 0/2] mac80211: add cleanup path for MPP table entries Bob Copeland
2016-01-28 15:07 ` Henning Rogge
2016-01-28 15:12 ` Bob Copeland
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