linux-kernel - Re: [PATCH] genirq: replace notify with old_notify in irq_set_affinity

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Message-ID: <20190928172507.6698545f@oasis.local.home>
Date:   Sat, 28 Sep 2019 17:25:07 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ivan Safonov <insafonov@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-rt-users@...r.kernel.org
Subject: Re: [PATCH] genirq: replace notify with old_notify in
 irq_set_affinity_notifier()

On Sat, 28 Sep 2019 18:19:20 +0300
Ivan Safonov <insafonov@...il.com> wrote:

> This patch is for Linux 4.19 with a RT patch.
> 
> The second 'if' block does not check notify for NULL,
> this leads to a system crash.
> 
> Most likely, there is a typo here.
> 
> With old_notify system works as expected.
> 
> Signed-off-by: Ivan Safonov <insafonov@...il.com>
> ---
>  kernel/irq/manage.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index 290cd520dba1..79a7072dfb3c 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -412,7 +412,7 @@ irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
>  
>  	if (old_notify) {
>  #ifdef CONFIG_PREEMPT_RT_BASE
> -		kthread_cancel_work_sync(&notify->work);
> +		kthread_cancel_work_sync(&old_notify->work);

Thanks for the patch, but I currently have an RFC out that rewrites all
this code. I'm hoping to apply the RFC patch next week.

-- Steve


>  #else
>  		cancel_work_sync(&old_notify->work);
>  #endif