linux-kernel - Re: drivers/char/hw_random/jh7110-trng.c:303 starfive_trng_probe() warn: passing zero to 'dev_err

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Date:   Mon, 20 Nov 2023 23:02:04 +0800
From:   Jia Jie Ho <jiajie.ho@...rfivetech.com>
To:     Dan Carpenter <dan.carpenter@...aro.org>,
        <oe-kbuild@...ts.linux.dev>
CC:     <lkp@...el.com>, <oe-kbuild-all@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: drivers/char/hw_random/jh7110-trng.c:303 starfive_trng_probe()
 warn: passing zero to 'dev_err_probe'

On 20/11/2023 10:22 pm, Dan Carpenter wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   c42d9eeef8e5ba9292eda36fd8e3c11f35ee065c
> commit: c388f458bc34eb3a5728b67f6614f9375cd99087 hwrng: starfive - Add TRNG driver for StarFive SoC
> config: riscv-randconfig-r071-20231112 (https://download.01.org/0day-ci/archive/20231116/202311160649.3GhKCfhd-lkp@intel.com/config)
> compiler: riscv64-linux-gcc (GCC) 13.2.0
> reproduce: (https://download.01.org/0day-ci/archive/20231116/202311160649.3GhKCfhd-lkp@intel.com/reproduce)
> 
> 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 <error27@...il.com>
> | Closes: https://lore.kernel.org/r/202311160649.3GhKCfhd-lkp@intel.com/
> 
> smatch warnings:
> drivers/char/hw_random/jh7110-trng.c:303 starfive_trng_probe() warn: passing zero to 'dev_err_probe'
> 
> vim +/dev_err_probe +303 drivers/char/hw_random/jh7110-trng.c
> 
> c388f458bc34eb Jia Jie Ho 2023-01-17  274  static int starfive_trng_probe(struct platform_device *pdev)
> c388f458bc34eb Jia Jie Ho 2023-01-17  275  {
> c388f458bc34eb Jia Jie Ho 2023-01-17  276  	int ret;
> c388f458bc34eb Jia Jie Ho 2023-01-17  277  	int irq;
> c388f458bc34eb Jia Jie Ho 2023-01-17  278  	struct starfive_trng *trng;
> c388f458bc34eb Jia Jie Ho 2023-01-17  279  
> c388f458bc34eb Jia Jie Ho 2023-01-17  280  	trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
> c388f458bc34eb Jia Jie Ho 2023-01-17  281  	if (!trng)
> c388f458bc34eb Jia Jie Ho 2023-01-17  282  		return -ENOMEM;
> c388f458bc34eb Jia Jie Ho 2023-01-17  283  
> c388f458bc34eb Jia Jie Ho 2023-01-17  284  	platform_set_drvdata(pdev, trng);
> c388f458bc34eb Jia Jie Ho 2023-01-17  285  	trng->dev = &pdev->dev;
> c388f458bc34eb Jia Jie Ho 2023-01-17  286  
> c388f458bc34eb Jia Jie Ho 2023-01-17  287  	trng->base = devm_platform_ioremap_resource(pdev, 0);
> c388f458bc34eb Jia Jie Ho 2023-01-17  288  	if (IS_ERR(trng->base))
> c388f458bc34eb Jia Jie Ho 2023-01-17  289  		return dev_err_probe(&pdev->dev, PTR_ERR(trng->base),
> c388f458bc34eb Jia Jie Ho 2023-01-17  290  				     "Error remapping memory for platform device.\n");
> c388f458bc34eb Jia Jie Ho 2023-01-17  291  
> c388f458bc34eb Jia Jie Ho 2023-01-17  292  	irq = platform_get_irq(pdev, 0);
> c388f458bc34eb Jia Jie Ho 2023-01-17  293  	if (irq < 0)
> c388f458bc34eb Jia Jie Ho 2023-01-17  294  		return irq;
> c388f458bc34eb Jia Jie Ho 2023-01-17  295  
> c388f458bc34eb Jia Jie Ho 2023-01-17  296  	init_completion(&trng->random_done);
> c388f458bc34eb Jia Jie Ho 2023-01-17  297  	init_completion(&trng->reseed_done);
> c388f458bc34eb Jia Jie Ho 2023-01-17  298  	spin_lock_init(&trng->write_lock);
> c388f458bc34eb Jia Jie Ho 2023-01-17  299  
> c388f458bc34eb Jia Jie Ho 2023-01-17  300  	ret = devm_request_irq(&pdev->dev, irq, starfive_trng_irq, 0, pdev->name,
> c388f458bc34eb Jia Jie Ho 2023-01-17  301  			       (void *)trng);
> c388f458bc34eb Jia Jie Ho 2023-01-17  302  	if (ret)
> c388f458bc34eb Jia Jie Ho 2023-01-17 @303  		return dev_err_probe(&pdev->dev, irq,
>                                                                                          ^^^
> Should be "ret".  Weird how we're getting this warning in November when
> the code is from Jan...  Looks like the bug is still their in linux-next
> though.
> 

I'll submit a patch for this.

Thanks,
Jia Jie