netdev - Re: [PATCH net-next 3/3] strparser: Generalize strparser

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Date:   Thu, 19 Oct 2017 10:42:17 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Tom Herbert <tom@...ntonium.net>
Cc:     netdev@...r.kernel.org, rohit@...ntonium.net,
        john.fastabend@...il.com
Subject: Re: [PATCH net-next 3/3] strparser: Generalize strparser

On Fri, 2017-07-28 at 16:22 -0700, Tom Herbert wrote:
> Generalize strparser from more than just being used in conjunction
> with read_sock. strparser will also be used in the send path with
> zero proxy. The primary change is to create strp_process function
> that performs the critical processing on skbs. The documentation
> is also updated to reflect the new uses.
> 
> Signed-off-by: Tom Herbert <tom@...ntonium.net>
> ---
>  Documentation/networking/strparser.txt | 207 +++++++++++++++-------
>  include/net/strparser.h                | 119 +++++++------
>  net/kcm/kcmproc.c                      |  34 ++--
>  net/kcm/kcmsock.c                      |  38 ++--
>  net/strparser/strparser.c              | 313 ++++++++++++++++++++-------------
>  5 files changed, 424 insertions(+), 287 deletions(-)

Just found this gem :

static void strp_msg_timeout(unsigned long arg)
{
        struct strparser *strp = (struct strparser *)arg;

        /* Message assembly timed out */
        STRP_STATS_INCR(strp->stats.msg_timeouts);
        strp->cb.lock(strp);
        strp->cb.abort_parser(strp, ETIMEDOUT);
        strp->cb.unlock(strp);
}

static void strp_sock_lock(struct strparser *strp)
{
        lock_sock(strp->sk);
}

static void strp_sock_unlock(struct strparser *strp)
{
        release_sock(strp->sk);
}


A timer runs from BH, and from this interrupt context it is absolutely
illegal to call lock_sock() ( and release_sock() )

Please fix, thanks !