Re: [PATCH v6 3/4] clk: sophgo: Add SG2042 clock generator driver

[Dan Carpenter]

Hi Chen,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Chen-Wang/dt-bindings-soc-sophgo-Add-Sophgo-system-control-module/20231208-091702
base:   b85ea95d086471afb4ad062012a4d73cd328fa86
patch link:    https://lore.kernel.org/r/d1aa4f76f360ebd7b790a4786641f1b0188dbba8.1701997033.git.unicorn_wang%40outlook.com
patch subject: [PATCH v6 3/4] clk: sophgo: Add SG2042 clock generator driver
config: xtensa-randconfig-r071-20231208 (https://download.01.org/0day-ci/archive/20231208/202312081933.MUdHNASt-lkp@xxxxxxxxx/config)
compiler: xtensa-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231208/202312081933.MUdHNASt-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
| Closes: https://lore.kernel.org/r/202312081933.MUdHNASt-lkp@xxxxxxxxx/

smatch warnings:
drivers/clk/sophgo/clk-sophgo-sg2042.c:1282 sg2042_clk_init_clk_data() warn: passing zero to 'PTR_ERR'

vim +/PTR_ERR +1282 drivers/clk/sophgo/clk-sophgo-sg2042.c

7c68ebea1041f9 Chen Wang 2023-12-08  1258  static int __init sg2042_clk_init_clk_data(
7c68ebea1041f9 Chen Wang 2023-12-08  1259  	struct device_node *node,
7c68ebea1041f9 Chen Wang 2023-12-08  1260  	int num_clks,
7c68ebea1041f9 Chen Wang 2023-12-08  1261  	struct sg2042_clk_data **pp_clk_data)
7c68ebea1041f9 Chen Wang 2023-12-08  1262  {
7c68ebea1041f9 Chen Wang 2023-12-08  1263  	int ret = 0;
7c68ebea1041f9 Chen Wang 2023-12-08  1264  	struct sg2042_clk_data *clk_data = NULL;
7c68ebea1041f9 Chen Wang 2023-12-08  1265  	struct device_node *np_syscon;
7c68ebea1041f9 Chen Wang 2023-12-08  1266  
7c68ebea1041f9 Chen Wang 2023-12-08  1267  	np_syscon = of_parse_phandle(node, "sophgo,system-ctrl", 0);
7c68ebea1041f9 Chen Wang 2023-12-08  1268  	if (!np_syscon) {
7c68ebea1041f9 Chen Wang 2023-12-08  1269  		pr_err("failed to get system-ctrl node\n");
7c68ebea1041f9 Chen Wang 2023-12-08  1270  		ret = -EINVAL;
7c68ebea1041f9 Chen Wang 2023-12-08  1271  		goto error_out;
7c68ebea1041f9 Chen Wang 2023-12-08  1272  	}
7c68ebea1041f9 Chen Wang 2023-12-08  1273  
7c68ebea1041f9 Chen Wang 2023-12-08  1274  	clk_data = kzalloc(struct_size(clk_data, onecell_data.hws, num_clks), GFP_KERNEL);
7c68ebea1041f9 Chen Wang 2023-12-08  1275  	if (!clk_data) {
7c68ebea1041f9 Chen Wang 2023-12-08  1276  		ret = -ENOMEM;
7c68ebea1041f9 Chen Wang 2023-12-08  1277  		goto error_out;
7c68ebea1041f9 Chen Wang 2023-12-08  1278  	}
7c68ebea1041f9 Chen Wang 2023-12-08  1279  
7c68ebea1041f9 Chen Wang 2023-12-08  1280  	clk_data->regmap_syscon = device_node_to_regmap(np_syscon);
7c68ebea1041f9 Chen Wang 2023-12-08  1281  	if (IS_ERR_OR_NULL(clk_data->regmap_syscon)) {
7c68ebea1041f9 Chen Wang 2023-12-08 @1282  		pr_err("cannot get regmap_syscon %ld\n", PTR_ERR(clk_data->regmap_syscon));

I don't think device_node_to_regmap() can return NULL, but if it could
then it shouldn't be handled like this:

https://staticthinking.wordpress.com/2022/08/01/mixing-error-pointers-and-null/


7c68ebea1041f9 Chen Wang 2023-12-08  1283  		ret = -ENODEV;
7c68ebea1041f9 Chen Wang 2023-12-08  1284  		goto cleanup;
7c68ebea1041f9 Chen Wang 2023-12-08  1285  	}
7c68ebea1041f9 Chen Wang 2023-12-08  1286  	clk_data->iobase_syscon = of_iomap(np_syscon, 0);
7c68ebea1041f9 Chen Wang 2023-12-08  1287  	clk_data->iobase = of_iomap(node, 0);
7c68ebea1041f9 Chen Wang 2023-12-08  1288  	clk_data->onecell_data.num = num_clks;
7c68ebea1041f9 Chen Wang 2023-12-08  1289  
7c68ebea1041f9 Chen Wang 2023-12-08  1290  	*pp_clk_data = clk_data;
7c68ebea1041f9 Chen Wang 2023-12-08  1291  	return ret;
7c68ebea1041f9 Chen Wang 2023-12-08  1292  
7c68ebea1041f9 Chen Wang 2023-12-08  1293  cleanup:
7c68ebea1041f9 Chen Wang 2023-12-08  1294  	kfree(clk_data);
7c68ebea1041f9 Chen Wang 2023-12-08  1295  
7c68ebea1041f9 Chen Wang 2023-12-08  1296  error_out:
7c68ebea1041f9 Chen Wang 2023-12-08  1297  	return ret;
7c68ebea1041f9 Chen Wang 2023-12-08  1298  }

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