linux-kernel - Re: [PATCH v3 03/14] irqchip/csky-mpintc: Fix potential resource leaks

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Date:   Wed, 24 Jun 2020 13:43:03 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>, linux-mips@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH v3 03/14] irqchip/csky-mpintc: Fix potential resource
 leaks

> There exists potential resource leaks in the error path, fix them.

I suggest to improve this change description.
How do you think about another wording variant?

   Specific system resources were not released in a few error cases.
   Thus add jump targets for the completion of the desired exception handling.


…
+++ b/drivers/irqchip/irq-csky-mpintc.c
@@ -247,8 +247,10 @@ csky_mpintc_init(struct device_node *node, struct device_node *parent)
…
 		INTCG_base = ioremap(mfcr("cr<31, 14>"),
 				     INTCL_SIZE*nr_cpu_ids + INTCG_SIZE);

See also:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst?id=3e08a95294a4fb3702bb3d35ed08028433c37fe6#n257


…
+		if (INTCG_base == NULL) {


Would you like to use the following code variant?

See also:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/scripts/checkpatch.pl?id=3e08a95294a4fb3702bb3d35ed08028433c37fe6#n5756

+		if (!INTCG_base) {


…
> @@ -270,12 +274,22 @@ csky_mpintc_init(struct device_node *node, struct device_node *parent)
>
>  #ifdef CONFIG_SMP
>  	ipi_irq = irq_create_mapping(root_domain, IPI_IRQ);
…
> +	if (!ipi_irq) {
> +		ret = -EIO;
> +		goto err_domain_remove;
> +	}
…

Can the function call “irq_domain_remove(root_domain)” become relevant
only if the preprocessor symbol “CONFIG_SMP” was defined?

Regards,
Markus