Re: [PATCH] padata: Use RCU when fetching pd from do_serial

[Herbert Xu]

On Tue, Jul 16, 2019 at 08:57:04PM +0800, Herbert Xu wrote:
>
> How about using RCU?
> 
> We still need to fix up the refcnt if it's supposed to limit the
> overall number of outstanding requests.

Hmm, it doesn't work because the refcnt is attached to the old
pd.  That shouldn't be a problem though as we could simply ignore
the refcnt in padata_flush_queue.

However, I think this leads to another bug in that pcrypt doesn't
support dm-crypt properly.  It never does the backlog stuff and
therefore can't guarantee reliable processing which dm-crypt requires.

Is it intentional to only allow pcrypt for IPsec?

Cheers,
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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