linux-kernel - Re: [PATCH] memory/tegra: Add missing of_node_get() in tegra_emc_find_node_by_ram

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Date:   Wed, 22 Jun 2022 16:35:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Liang He <windhl@....com>, krzysztof.kozlowski@...aro.org,
        thierry.reding@...il.com, jonathanh@...dia.com
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org, windhl@....com,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH] memory/tegra: Add missing of_node_get() in
 tegra_emc_find_node_by_ram_code

Hi Liang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tegra/for-next]
[also build test ERROR on tegra-drm/drm/tegra/for-next linus/master v5.19-rc3 next-20220621]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Liang-He/memory-tegra-Add-missing-of_node_get-in-tegra_emc_find_node_by_ram_code/20220622-123052
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux.git for-next
config: hexagon-randconfig-r041-20220622 (https://download.01.org/0day-ci/archive/20220622/202206221602.odN70SHs-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 8b8d126598ce7bd5243da7f94f69fa1104288bee)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/6f5dd7a2fb5c7d45a25cdf4409c5aa03c4df0a96
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Liang-He/memory-tegra-Add-missing-of_node_get-in-tegra_emc_find_node_by_ram_code/20220622-123052
        git checkout 6f5dd7a2fb5c7d45a25cdf4409c5aa03c4df0a96
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/memory/tegra/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> drivers/memory/tegra/tegra20-emc.c:480:2: error: call to undeclared function 'of_get_node'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           of_get_node(dev->of_node);
           ^
   1 error generated.


vim +/of_get_node +480 drivers/memory/tegra/tegra20-emc.c

   456	
   457	static struct device_node *
   458	tegra_emc_find_node_by_ram_code(struct tegra_emc *emc)
   459	{
   460		struct device *dev = emc->dev;
   461		struct device_node *np;
   462		u32 value, ram_code;
   463		int err;
   464	
   465		if (emc->mrr_error) {
   466			dev_warn(dev, "memory timings skipped due to MRR error\n");
   467			return NULL;
   468		}
   469	
   470		if (of_get_child_count(dev->of_node) == 0) {
   471			dev_info_once(dev, "device-tree doesn't have memory timings\n");
   472			return NULL;
   473		}
   474	
   475		if (!of_property_read_bool(dev->of_node, "nvidia,use-ram-code"))
   476			return of_node_get(dev->of_node);
   477	
   478		ram_code = tegra_read_ram_code();
   479	
 > 480		of_get_node(dev->of_node);
   481		for (np = of_find_node_by_name(dev->of_node, "emc-tables"); np;
   482		     np = of_find_node_by_name(np, "emc-tables")) {
   483			err = of_property_read_u32(np, "nvidia,ram-code", &value);
   484			if (err || value != ram_code) {
   485				struct device_node *lpddr2_np;
   486				bool cfg_mismatches = false;
   487	
   488				of_node_get(np);
   489				lpddr2_np = of_find_node_by_name(np, "lpddr2");
   490				if (lpddr2_np) {
   491					const struct lpddr2_info *info;
   492	
   493					info = of_lpddr2_get_info(lpddr2_np, dev);
   494					if (info) {
   495						if (info->manufacturer_id >= 0 &&
   496						    info->manufacturer_id != emc->manufacturer_id)
   497							cfg_mismatches = true;
   498	
   499						if (info->revision_id1 >= 0 &&
   500						    info->revision_id1 != emc->revision_id1)
   501							cfg_mismatches = true;
   502	
   503						if (info->revision_id2 >= 0 &&
   504						    info->revision_id2 != emc->revision_id2)
   505							cfg_mismatches = true;
   506	
   507						if (info->density != emc->basic_conf4.density)
   508							cfg_mismatches = true;
   509	
   510						if (info->io_width != emc->basic_conf4.io_width)
   511							cfg_mismatches = true;
   512	
   513						if (info->arch_type != emc->basic_conf4.arch_type)
   514							cfg_mismatches = true;
   515					} else {
   516						dev_err(dev, "failed to parse %pOF\n", lpddr2_np);
   517						cfg_mismatches = true;
   518					}
   519	
   520					of_node_put(lpddr2_np);
   521				} else {
   522					cfg_mismatches = true;
   523				}
   524	
   525				if (cfg_mismatches) {
   526					continue;
   527				}
   528			}
   529	
   530			return np;
   531		}
   532	
   533		dev_err(dev, "no memory timings for RAM code %u found in device tree\n",
   534			ram_code);
   535	
   536		return NULL;
   537	}
   538	

-- 
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https://01.org/lkp