linux-kernel - Re: drivers/irqchip/irq-ti-sci-intr.c:148 ti_sci_intr_alloc_parent_irq() warn: impossible condition '(p

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Date:   Thu, 3 Sep 2020 17:56:24 +0530
From:   Lokesh Vutla <lokeshvutla@...com>
To:     Dan Carpenter <dan.carpenter@...cle.com>, <kbuild@...ts.01.org>
CC:     <lkp@...el.com>, Dan Carpenter <error27@...il.com>,
        <kbuild-all@...ts.01.org>, <linux-kernel@...r.kernel.org>,
        Marc Zyngier <maz@...nel.org>
Subject: Re: drivers/irqchip/irq-ti-sci-intr.c:148
 ti_sci_intr_alloc_parent_irq() warn: impossible condition '(p_hwirq < 0) =>
 (0-u16max < 0)'

Hi Dan,

On 03/09/20 5:51 pm, Dan Carpenter wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   fc3abb53250a90ba2150eebd182137c136f4d25a
> commit: a5b659bd4bc7518a8e45fda5256c5e5e8d3b7c49 irqchip/ti-sci-intr: Add support for INTR being a parent to INTR
> config: arm64-randconfig-m031-20200902 (attached as .config)
> compiler: aarch64-linux-gcc (GCC) 9.3.0
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> smatch warnings:
> drivers/irqchip/irq-ti-sci-intr.c:148 ti_sci_intr_alloc_parent_irq() warn: impossible condition '(p_hwirq < 0) => (0-u16max < 0)'
> 
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a5b659bd4bc7518a8e45fda5256c5e5e8d3b7c49
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout a5b659bd4bc7518a8e45fda5256c5e5e8d3b7c49
> vim +148 drivers/irqchip/irq-ti-sci-intr.c
> 
> a5b659bd4bc751 Lokesh Vutla 2020-08-06  134  static int ti_sci_intr_alloc_parent_irq(struct irq_domain *domain,
> cd844b0715ceda Lokesh Vutla 2019-04-30  135  					unsigned int virq, u32 hwirq)
> cd844b0715ceda Lokesh Vutla 2019-04-30  136  {
> cd844b0715ceda Lokesh Vutla 2019-04-30  137  	struct ti_sci_intr_irq_domain *intr = domain->host_data;
> a5b659bd4bc751 Lokesh Vutla 2020-08-06  138  	struct device_node *parent_node;
> cd844b0715ceda Lokesh Vutla 2019-04-30  139  	struct irq_fwspec fwspec;
> a5b659bd4bc751 Lokesh Vutla 2020-08-06  140  	u16 out_irq, p_hwirq;
>                                                 ^^^          ^^^^^^^
> 
> a5b659bd4bc751 Lokesh Vutla 2020-08-06  141  	int err = 0;
> cd844b0715ceda Lokesh Vutla 2019-04-30  142  
> a5b659bd4bc751 Lokesh Vutla 2020-08-06  143  	out_irq = ti_sci_get_free_resource(intr->out_irqs);
> a5b659bd4bc751 Lokesh Vutla 2020-08-06  144  	if (out_irq == TI_SCI_RESOURCE_NULL)
> cd844b0715ceda Lokesh Vutla 2019-04-30  145  		return -EINVAL;
> cd844b0715ceda Lokesh Vutla 2019-04-30  146  
> a5b659bd4bc751 Lokesh Vutla 2020-08-06  147  	p_hwirq = ti_sci_intr_xlate_irq(intr, out_irq);
> a5b659bd4bc751 Lokesh Vutla 2020-08-06 @148  	if (p_hwirq < 0)
>                                                     ^^^^^^^^^^^
> Impossible

This is already fixed by https://patchwork.kernel.org/patch/11737169/

Thanks and regards,
Lokesh