linux-kernel - Re: [PATCH v4 02/14] irqchip/csky-apb-intc: Fix potential resource leaks

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Date:   Thu, 2 Jul 2020 09:18:25 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Markus Elfring <Markus.Elfring@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>, Guo Ren <guoren@...nel.org>,
        linux-csky@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v4 02/14] irqchip/csky-apb-intc: Fix potential resource
 leaks

On 07/01/2020 09:04 PM, Markus Elfring wrote:
>> If remove the local variable "ret",  it will look like this:
> …
>> +++ b/drivers/irqchip/irq-csky-apb-intc.c
> …
>> @@ -118,18 +116,23 @@ ck_intc_init_comm(struct device_node *node, struct device_node *parent)
> …
>> -       ret = irq_alloc_domain_generic_chips(root_domain, 32, 1,
>> +       if (irq_alloc_domain_generic_chips(root_domain, 32, 1,
>>                          "csky_intc", handle_level_irq,
>> -                       IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN, 0, 0);
>> -       if (ret) {
>> +                       IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN, 0, 0)) {
>>                  pr_err("C-SKY Intc irq_alloc_gc failed.\n");
> …
>
> I suggest to recheck the parameter alignment for such a function call.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst?id=7c30b859a947535f2213277e827d7ac7dcff9c84#n93

OK, thank you, like this:

-       ret = irq_alloc_domain_generic_chips(root_domain, 32, 1,
-                       "csky_intc", handle_level_irq,
-                       IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN, 0, 0);
-       if (ret) {
+       if (irq_alloc_domain_generic_chips(root_domain, 32, 1,
+                                          "csky_intc", handle_level_irq,
+                                          IRQ_NOREQUEST | IRQ_NOPROBE | 
IRQ_NOAUTOEN, 0, 0)) {
                 pr_err("C-SKY Intc irq_alloc_gc failed.\n");
-               return -ENOMEM;
+               goto err_domain_remove;
         }

>
> Regards,
> Markus