linux-kernel - Re: [PATCH] gpio: pxa: use devres for the clock struct

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Date:   Fri, 26 Aug 2022 14:18:11 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hulk Robot <hulkci@...wei.com>, Yuan Can <yuancan@...wei.com>,
        Kernel Janitors <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] gpio: pxa: use devres for the clock struct

Le 26/08/2022 à 10:20, Linus Walleij a écrit :
> On Sat, Aug 20, 2022 at 12:15 AM Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
>> On Mon, Aug 15, 2022 at 12:26 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>>>
>>> The clock is never released after probe(). Use devres to not leak
>>> resources.
>>
>> ...
>>
>>> -       clk = clk_get(&pdev->dev, NULL);
>>> +       clk = devm_clk_get_enabled(&pdev->dev, NULL);
>>>          if (IS_ERR(clk)) {
>>>                  dev_err(&pdev->dev, "Error %ld to get gpio clock\n",
>>>                          PTR_ERR(clk));
>>>                  return PTR_ERR(clk);
>>
>> Shouldn't we fix a potential log saturation issue first (by switching
>> to use dev_err_probe() helper)?
> 
> Can be a separate patch, the clock mem leak is a bigger problem
> IMO so this should be applied first.
> 
> Hm isn't it possible to toss the task of fixing a gazillion
> dev_err_probe() messages on Cocinelle scripts/coccinelle/? I bet it's something
> the kernel janitors could fix all over the place.
> 
> Yours,
> Linus Walleij
> 

Not perfect and certainly incomplete, but gives an idea:


@@
expression x, dev, e, str;
@@
(
	x = devm_clk_get(dev, e);
|
	x = clk_get(dev, e);
)
-	if (IS_ERR(x)) {
-		dev_err(dev, str);
-		return PTR_ERR(x);
-	}
+	if (IS_ERR(x))
+		return dev_err_probe(dev, PTR_ERR(x), str);

// This rule only: 291 files changed, 1233 insertions(+), 1634 deletions(-)


// The output of this rule needs to be adjusted to fix the 'str'. The
// error code and related text have to be manually removed
@@
expression x, dev, e, str;
@@
(
	x = devm_clk_get(dev, e);
|
	x = clk_get(dev, e);
)
-	if (IS_ERR(x)) {
-		dev_err(dev, str, PTR_ERR(x));
-		return PTR_ERR(x);
-	}
+	if (IS_ERR(x))
+		return dev_err_probe(dev, PTR_ERR(x), str);

// Both rules: 316 files changed, 1321 insertions(+), 1774 deletions(-)