linux-kernel - Re: [irqchip: irq/irqchip-next] irqchip/ls-extirq: Fix endianness detection

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Date:   Mon, 19 Dec 2022 13:17:02 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Sean Anderson <sean.anderson@...o.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        tglx@...utronix.de
Subject: Re: [irqchip: irq/irqchip-next] irqchip/ls-extirq: Fix endianness
 detection

On Fri, Dec 16, 2022 at 07:23:36PM +0000, Marc Zyngier wrote:
> On 2022-12-16 19:11, Sean Anderson wrote:
> > On 12/16/22 13:22, Marc Zyngier wrote:
> > > On 2022-12-16 16:37, Sean Anderson wrote:
> > > > Hi Stable maintainers,
> > > > 
> > > > On 12/5/22 06:21, irqchip-bot for Sean Anderson wrote:
> > > > > The following commit has been merged into the
> > > > > irq/irqchip-next branch of irqchip:
> > > > > 
> > > > > Commit-ID:     3ae977d0e4e3a2a2ccc912ca2d20c9430508ecdd
> > > > > Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/3ae977d0e4e3a2a2ccc912ca2d20c9430508ecdd
> > > > > Author:        Sean Anderson <sean.anderson@...o.com>
> > > > > AuthorDate:    Thu, 01 Dec 2022 16:28:07 -05:00
> > > > > Committer:     Marc Zyngier <maz@...nel.org>
> > > > > CommitterDate: Mon, 05 Dec 2022 10:39:52
> > > > > 
> > > > > irqchip/ls-extirq: Fix endianness detection
> > > > > 
> > > > > parent is the interrupt parent, not the parent of node. Use
> > > > > node->parent. This fixes endianness detection on big-endian
> > > > > platforms.
> > > > > 
> > > > > Fixes: 1b00adce8afd ("irqchip/ls-extirq: Fix invalid wait
> > > > > context by avoiding to use regmap")
> > > > > Signed-off-by: Sean Anderson <sean.anderson@...o.com>
> > > > > Signed-off-by: Marc Zyngier <maz@...nel.org>
> > > > > Link: https://lore.kernel.org/r/20221201212807.616191-1-sean.anderson@seco.com
> > > > > ---
> > > > >  drivers/irqchip/irq-ls-extirq.c | 2 +-
> > > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > > 
> > > > > diff --git a/drivers/irqchip/irq-ls-extirq.c
> > > > > b/drivers/irqchip/irq-ls-extirq.c
> > > > > index d8d48b1..139f26b 100644
> > > > > --- a/drivers/irqchip/irq-ls-extirq.c
> > > > > +++ b/drivers/irqchip/irq-ls-extirq.c
> > > > > @@ -203,7 +203,7 @@ ls_extirq_of_init(struct device_node
> > > > > *node, struct device_node *parent)
> > > > >         if (ret)
> > > > >                 goto err_parse_map;
> > > > > 
> > > > > -       priv->big_endian = of_device_is_big_endian(parent);
> > > > > +       priv->big_endian = of_device_is_big_endian(node->parent);
> > > > >         priv->is_ls1021a_or_ls1043a =
> > > > > of_device_is_compatible(node, "fsl,ls1021a-extirq") ||
> > > > >                                      
> > > > > of_device_is_compatible(node, "fsl,ls1043a-extirq");
> > > > >         raw_spin_lock_init(&priv->lock);
> > > > 
> > > > This patch has made it into linux/master, but it should also get
> > > > backported to 6.1. Just want to make sure this doesn't fall
> > > > through the
> > > > cracks, since this was a really annoying bug to deal with
> > > > (causes an IRQ
> > > > storm).
> > > 
> > > If you wanted it backported, why didn't it have a Cc: stable
> > > the first place? In any case, if you want a backport to happen,
> > > you'll have to post that backport.
> > 
> > Usually, anything with a Fixes: tag gets picked up.

That is NEVER guaranteed at all, please use the system we have had for
the past 18+ years and properly tag patches with "cc: stable" that you
want applied to a stable tree.

> > Actually, I was
> > expecting you to submit a PR for 6.1, since this was submitted before
> > that release came out.
> 
> Expectations are better stated rather than being implicit.
> 
> > That said, this email is "option 2" of
> > Documentation/process/stable-kernel-rules.rst, so I don't think I need
> > to do "option 3".
> 
> Here's to hope!

I queued it up now, thanks.

greg k-h