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Date:   Wed, 13 Feb 2019 21:47:27 +0800
From:   Herbert Xu <>
To:     David Miller <>,,,,,,
Subject: Re: [PATCH 1/2] mac80211: Use linked list instead of rhashtable walk
 for mesh tables

On Wed, Feb 13, 2019 at 01:16:13PM +0800, Herbert Xu wrote:
> The mesh table code walks over hash tables for two purposes.  First of
> all it's used as part of a netlink dump process, but it is also used
> for looking up entries to delete using criteria other than the hash
> key.
> The second purpose is directly contrary to the design specification
> of rhashtable walks.  It is only meant for use by netlink dumps.
> This is because rhashtable is resizable and you cannot obtain a
> stable walk over it during a resize process.
> In fact mesh's use of rhashtable for dumping is bogus too.  Rather
> than using rhashtable walk's iterator to keep track of the current
> position, it always converts the current position to an integer
> which defeats the purpose of the iterator.
> Therefore this patch converts all uses of rhashtable walk into a
> simple linked list.
> Signed-off-by: Herbert Xu <>

OK this patch is broken because there is no locking on the linked
list.  I'll repost the series.

Email: Herbert Xu <>
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