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

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Date:   Fri, 16 Dec 2022 11:37:33 -0500
From:   Sean Anderson <sean.anderson@...o.com>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marc Zyngier <maz@...nel.org>, tglx@...utronix.de
Subject: Re: [irqchip: irq/irqchip-next] irqchip/ls-extirq: Fix endianness
 detection

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).

--Sean