[kkdwivedi:coroutine 1/19] arch/arm/mach-mxs/mach-mxs.c:149 mxs_get_ocotp() warn: 'ocotp_base' from of_iomap() not released on lines: 149.

[kernel test robot <lkp@intel.com>]

Unfiltered warning: this smatch report is sent as-is and has not been
reviewed for false positives, so please treat it with due skepticism.

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Kumar Kartikeya Dwivedi <memxor@gmail.com>

tree:   https://github.com/kkdwivedi/linux coroutine
head:   0813a9d05d658bcd6b8f960368b4c046e24ae1c9
commit: 87bfa22937000db29a9a09ec826ab7227eaf9e8c [1/19] bpf: Reject BTF ids with the same address in tracing_multi link
:::::: branch date: 9 hours ago
:::::: commit date: 19 hours ago
config: arm-randconfig-r2202-20261012 (https://download.01.org/0day-ci/archive/20261013/202610130510.dfDBWM0r-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 16.1.0
smatch: v0.5.0-9187-g5189e3fb

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@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202610130510.dfDBWM0r-lkp@intel.com/

smatch warnings:
arch/arm/mach-mxs/mach-mxs.c:149 mxs_get_ocotp() warn: 'ocotp_base' from of_iomap() not released on lines: 149.

vim +/ocotp_base +149 arch/arm/mach-mxs/mach-mxs.c

1bff2d76ac88d5 Shawn Guo 2013-03-29   85  
1bff2d76ac88d5 Shawn Guo 2013-03-29   86  static const u32 *mxs_get_ocotp(void)
1bff2d76ac88d5 Shawn Guo 2013-03-29   87  {
1bff2d76ac88d5 Shawn Guo 2013-03-29   88  	struct device_node *np;
1bff2d76ac88d5 Shawn Guo 2013-03-29   89  	void __iomem *ocotp_base;
1bff2d76ac88d5 Shawn Guo 2013-03-29   90  	int timeout = 0x400;
1bff2d76ac88d5 Shawn Guo 2013-03-29   91  	size_t i;
1bff2d76ac88d5 Shawn Guo 2013-03-29   92  	static int once;
1bff2d76ac88d5 Shawn Guo 2013-03-29   93  
1bff2d76ac88d5 Shawn Guo 2013-03-29   94  	if (once)
1bff2d76ac88d5 Shawn Guo 2013-03-29   95  		return ocotp_words;
1bff2d76ac88d5 Shawn Guo 2013-03-29   96  
1bff2d76ac88d5 Shawn Guo 2013-03-29   97  	np = of_find_compatible_node(NULL, NULL, "fsl,ocotp");
1bff2d76ac88d5 Shawn Guo 2013-03-29   98  	ocotp_base = of_iomap(np, 0);
1bff2d76ac88d5 Shawn Guo 2013-03-29   99  	WARN_ON(!ocotp_base);
1bff2d76ac88d5 Shawn Guo 2013-03-29  100  
1bff2d76ac88d5 Shawn Guo 2013-03-29  101  	mutex_lock(&ocotp_mutex);
1bff2d76ac88d5 Shawn Guo 2013-03-29  102  
1bff2d76ac88d5 Shawn Guo 2013-03-29  103  	/*
1bff2d76ac88d5 Shawn Guo 2013-03-29  104  	 * clk_enable(hbus_clk) for ocotp can be skipped
1bff2d76ac88d5 Shawn Guo 2013-03-29  105  	 * as it must be on when system is running.
1bff2d76ac88d5 Shawn Guo 2013-03-29  106  	 */
1bff2d76ac88d5 Shawn Guo 2013-03-29  107  
1bff2d76ac88d5 Shawn Guo 2013-03-29  108  	/* try to clear ERROR bit */
1bff2d76ac88d5 Shawn Guo 2013-03-29  109  	__mxs_clrl(BM_OCOTP_CTRL_ERROR, ocotp_base);
1bff2d76ac88d5 Shawn Guo 2013-03-29  110  
1bff2d76ac88d5 Shawn Guo 2013-03-29  111  	/* check both BUSY and ERROR cleared */
1bff2d76ac88d5 Shawn Guo 2013-03-29  112  	while ((__raw_readl(ocotp_base) &
1bff2d76ac88d5 Shawn Guo 2013-03-29  113  		(BM_OCOTP_CTRL_BUSY | BM_OCOTP_CTRL_ERROR)) && --timeout)
1bff2d76ac88d5 Shawn Guo 2013-03-29  114  		cpu_relax();
1bff2d76ac88d5 Shawn Guo 2013-03-29  115  
1bff2d76ac88d5 Shawn Guo 2013-03-29  116  	if (unlikely(!timeout))
1bff2d76ac88d5 Shawn Guo 2013-03-29  117  		goto error_unlock;
1bff2d76ac88d5 Shawn Guo 2013-03-29  118  
1bff2d76ac88d5 Shawn Guo 2013-03-29  119  	/* open OCOTP banks for read */
1bff2d76ac88d5 Shawn Guo 2013-03-29  120  	__mxs_setl(BM_OCOTP_CTRL_RD_BANK_OPEN, ocotp_base);
1bff2d76ac88d5 Shawn Guo 2013-03-29  121  
1bff2d76ac88d5 Shawn Guo 2013-03-29  122  	/* approximately wait 32 hclk cycles */
1bff2d76ac88d5 Shawn Guo 2013-03-29  123  	udelay(1);
1bff2d76ac88d5 Shawn Guo 2013-03-29  124  
1bff2d76ac88d5 Shawn Guo 2013-03-29  125  	/* poll BUSY bit becoming cleared */
1bff2d76ac88d5 Shawn Guo 2013-03-29  126  	timeout = 0x400;
1bff2d76ac88d5 Shawn Guo 2013-03-29  127  	while ((__raw_readl(ocotp_base) & BM_OCOTP_CTRL_BUSY) && --timeout)
1bff2d76ac88d5 Shawn Guo 2013-03-29  128  		cpu_relax();
1bff2d76ac88d5 Shawn Guo 2013-03-29  129  
1bff2d76ac88d5 Shawn Guo 2013-03-29  130  	if (unlikely(!timeout))
1bff2d76ac88d5 Shawn Guo 2013-03-29  131  		goto error_unlock;
1bff2d76ac88d5 Shawn Guo 2013-03-29  132  
1bff2d76ac88d5 Shawn Guo 2013-03-29  133  	for (i = 0; i < OCOTP_WORD_COUNT; i++)
1bff2d76ac88d5 Shawn Guo 2013-03-29  134  		ocotp_words[i] = __raw_readl(ocotp_base + OCOTP_WORD_OFFSET +
1bff2d76ac88d5 Shawn Guo 2013-03-29  135  						i * 0x10);
1bff2d76ac88d5 Shawn Guo 2013-03-29  136  
1bff2d76ac88d5 Shawn Guo 2013-03-29  137  	/* close banks for power saving */
1bff2d76ac88d5 Shawn Guo 2013-03-29  138  	__mxs_clrl(BM_OCOTP_CTRL_RD_BANK_OPEN, ocotp_base);
1bff2d76ac88d5 Shawn Guo 2013-03-29  139  
1bff2d76ac88d5 Shawn Guo 2013-03-29  140  	once = 1;
1bff2d76ac88d5 Shawn Guo 2013-03-29  141  
1bff2d76ac88d5 Shawn Guo 2013-03-29  142  	mutex_unlock(&ocotp_mutex);
1bff2d76ac88d5 Shawn Guo 2013-03-29  143  
1bff2d76ac88d5 Shawn Guo 2013-03-29  144  	return ocotp_words;
1bff2d76ac88d5 Shawn Guo 2013-03-29  145  
1bff2d76ac88d5 Shawn Guo 2013-03-29  146  error_unlock:
1bff2d76ac88d5 Shawn Guo 2013-03-29  147  	mutex_unlock(&ocotp_mutex);
1bff2d76ac88d5 Shawn Guo 2013-03-29  148  	pr_err("%s: timeout in reading OCOTP\n", __func__);
1bff2d76ac88d5 Shawn Guo 2013-03-29 @149  	return NULL;
1bff2d76ac88d5 Shawn Guo 2013-03-29  150  }
1bff2d76ac88d5 Shawn Guo 2013-03-29  151  

:::::: The code at line 149 was first introduced by commit
:::::: 1bff2d76ac88d59e45d2ba0d1103be210a9eca11 ARM: mxs: move mxs_get_ocotp() into mach-mxs.c

:::::: TO: Shawn Guo <shawn.guo@linaro.org>
:::::: CC: Shawn Guo <shawn.guo@linaro.org>

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