linux-kernel - Re: [PATCH 01/13] a2b: add A2B driver core

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Date: Sun, 19 May 2024 10:38:25 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Alvin Šipraga <alsi@...g-olufsen.dk>,
 devicetree@...r.kernel.org, linux-sound@...r.kernel.org,
 linux-i2c@...r.kernel.org, linux-gpio@...r.kernel.org,
 linux-clk@...r.kernel.org, kernel-janitors@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>, Alvin Šipraga
 <alvin@...s.dk>, Emil Svendsen <emas@...g-olufsen.dk>,
 Andi Shyti <andi.shyti@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>,
 Conor Dooley <conor+dt@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jaroslav Kysela <perex@...ex.cz>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Liam Girdwood <lgirdwood@...il.com>, Linus Walleij
 <linus.walleij@...aro.org>, Mark Brown <broonie@...nel.org>,
 Michael Turquette <mturquette@...libre.com>,
 "Rafael J. Wysocki" <rafael@...nel.org>, Rob Herring <robh@...nel.org>,
 Saravana Kannan <saravanak@...gle.com>, Stephen Boyd <sboyd@...nel.org>,
 Takashi Iwai <tiwai@...e.com>
Subject: Re: [PATCH 01/13] a2b: add A2B driver core

…
> +++ b/drivers/a2b/a2b.c
> @@ -0,0 +1,1252 @@
…
> +static int a2b_bus_of_add_node(struct a2b_bus *bus, struct device_node *np,
> +			       unsigned int addr)
> +{
…
> +	node = kzalloc(sizeof(*node), GFP_KERNEL);
> +	if (IS_ERR(node))
> +		return -ENOMEM;

Please improve the distinction for checks according to the handling of error/null pointers.

…
> +	ret = device_register(&node->dev);
> +	if (ret)
> +		goto err_put_device;
> +
> +	return 0;
> +
> +err_put_device:
> +	put_device(&node->dev);
> +
> +	return ret;
> +}

Did you overlook to release the node memory after a failed function call
at such a source code place?

Regards,
Markus