linux-kernel - Re: [PATCH 1/2] pinctrl: th1520: Convert to thp->mutex to guarded mutex

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Message-ID: <ZwQNc9/sO9lhUvmw@x1>
Date: Mon, 7 Oct 2024 09:33:55 -0700
From: Drew Fustini <dfustini@...storrent.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: oe-kbuild@...ts.linux.dev, Drew Fustini <drew@...7.com>,
	Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
	Linus Walleij <linus.walleij@...aro.org>, lkp@...el.com,
	oe-kbuild-all@...ts.linux.dev, linux-riscv@...ts.infradead.org,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] pinctrl: th1520: Convert to thp->mutex to guarded
 mutex

On Mon, Oct 07, 2024 at 06:41:36PM +0300, Dan Carpenter wrote:
> Hi Drew,
> 
> kernel test robot noticed the following build warnings:
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Drew-Fustini/pinctrl-th1520-Convert-to-thp-mutex-to-guarded-mutex/20241006-033647
> base:   2694868880705e8f6bb61b24b1b25adc42a4a217
> patch link:    https://lore.kernel.org/r/20241005-th1520-pinctrl-fixes-v1-1-5c65dffa0d00%40tenstorrent.com
> patch subject: [PATCH 1/2] pinctrl: th1520: Convert to thp->mutex to guarded mutex
> config: parisc-randconfig-r072-20241007 (https://download.01.org/0day-ci/archive/20241007/202410072108.uG2sVTN4-lkp@intel.com/config)
> compiler: hppa-linux-gcc (GCC) 14.1.0
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> | Closes: https://lore.kernel.org/r/202410072108.uG2sVTN4-lkp@intel.com/
> 
> New smatch warnings:
> drivers/pinctrl/pinctrl-th1520.c:538 th1520_pinctrl_dt_node_to_map() error: uninitialized symbol 'child'.

It seems this is because the scoped iterator declares *child in the
macro and thus no separate declaration is needed:

#define for_each_available_child_of_node_scoped(parent, child) \
	for (struct device_node *child __free(device_node) =		\
	     of_get_next_available_child(parent, NULL);			\
	     child != NULL;						\
	     child = of_get_next_available_child(parent, child))

I'll fix in future revision.

> 
> Old smatch warnings:
> drivers/pinctrl/pinctrl-th1520.c:502 th1520_pinctrl_dt_node_to_map() warn: missing error code 'ret'

This has been fixed in the v2 series [1]

Thanks,
Drew

[1] https://lore.kernel.org/linux-riscv/20241006-th1520-pinctrl-fixes-v2-0-b1822ae3a6d7@tenstorrent.com/