netdev - Re: [PATCH net-next] net: Correct wrong BH disable in hard-interrupt.

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Message-ID: <alpine.DEB.2.22.394.2202230853240.386844@ramsan.of.borg>
Date:   Wed, 23 Feb 2022 08:56:23 +0100 (CET)
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
cc:     Marek Szyprowski <m.szyprowski@...sung.com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Toke Høiland-Jørgensen <toke@...e.dk>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [PATCH net-next] net: Correct wrong BH disable in
 hard-interrupt.

 	Hi Sebastian,

On Wed, 16 Feb 2022, Sebastian Andrzej Siewior wrote:
> I missed the obvious case where netif_ix() is invoked from hard-IRQ
> context.
>
> Disabling bottom halves is only needed in process context. This ensures
> that the code remains on the current CPU and that the soft-interrupts
> are processed at local_bh_enable() time.
> In hard- and soft-interrupt context this is already the case and the
> soft-interrupts will be processed once the context is left (at irq-exit
> time).
>
> Disable bottom halves if neither hard-interrupts nor soft-interrupts are
> disabled. Update the kernel-doc, mention that interrupts must be enabled
> if invoked from process context.
>
> Fixes: baebdf48c3600 ("net: dev: Makes sure netif_rx() can be invoked in any context.")
> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Thanks, this fixes the issue on rbtx4927[1].

Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>

[1] https://lore.kernel.org/all/alpine.DEB.2.22.394.2202221622570.372449@ramsan.of.borg/

Gr{oetje,eeting}s,

 						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
 							    -- Linus Torvalds