linux-kernel - 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 09:22:03 -0500
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     oe-kbuild@...ts.linux.dev, Jia Jie Ho <jiajie.ho@...rfivetech.com>
Cc:     lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Jenny Zhang <jenny.zhang@...rfivetech.com>
Subject: drivers/char/hw_random/jh7110-trng.c:303 starfive_trng_probe() warn:
 passing zero to 'dev_err_probe'

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.

c388f458bc34eb Jia Jie Ho 2023-01-17  304  				     "Failed to register interrupt handler\n");
c388f458bc34eb Jia Jie Ho 2023-01-17  305  
c388f458bc34eb Jia Jie Ho 2023-01-17  306  	trng->hclk = devm_clk_get(&pdev->dev, "hclk");
c388f458bc34eb Jia Jie Ho 2023-01-17  307  	if (IS_ERR(trng->hclk))
c388f458bc34eb Jia Jie Ho 2023-01-17  308  		return dev_err_probe(&pdev->dev, PTR_ERR(trng->hclk),
c388f458bc34eb Jia Jie Ho 2023-01-17  309  				     "Error getting hardware reference clock\n");
c388f458bc34eb Jia Jie Ho 2023-01-17  310  
c388f458bc34eb Jia Jie Ho 2023-01-17  311  	trng->ahb = devm_clk_get(&pdev->dev, "ahb");
c388f458bc34eb Jia Jie Ho 2023-01-17  312  	if (IS_ERR(trng->ahb))
c388f458bc34eb Jia Jie Ho 2023-01-17  313  		return dev_err_probe(&pdev->dev, PTR_ERR(trng->ahb),
c388f458bc34eb Jia Jie Ho 2023-01-17  314  				     "Error getting ahb reference clock\n");
c388f458bc34eb Jia Jie Ho 2023-01-17  315  
c388f458bc34eb Jia Jie Ho 2023-01-17  316  	trng->rst = devm_reset_control_get_shared(&pdev->dev, NULL);
c388f458bc34eb Jia Jie Ho 2023-01-17  317  	if (IS_ERR(trng->rst))

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki