Subject: Re: [PATCH v2 1/1] net: fec: ptp: avoid register access when ipg clock is disabled

From: kernel test robot <[email-masked]>
Date: Fri, 26 Feb 2021 06:34:54 +0800

Hi Heiko,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on net/master]
[also build test ERROR on net-next/master ipvs/master linus/master v5.11 next-20210225]
[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/0day-ci/linux/commits/Heiko-Thiery/net-fec-ptp-avoid-register-access-when-ipg-clock-is-disabled/20210226-050218
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git 6cf739131a15e4177e58a1b4f2bede9d5da78552
config: mips-randconfig-r013-20210225 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a921aaf789912d981cbb2036bdc91ad7289e1523)
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
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/0day-ci/linux/commit/a7258bb15d947bb808b6209012a56ae993ec6001
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Heiko-Thiery/net-fec-ptp-avoid-register-access-when-ipg-clock-is-disabled/20210226-050218
        git checkout a7258bb15d947bb808b6209012a56ae993ec6001
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email-masked]>

All error/warnings (new ones prefixed by >>):

>> drivers/net/ethernet/freescale/fec_ptp.c:380:14: error: use of undeclared identifier 'fep'
           mutex_lock(&fep->ptp_clk_mutex);
                       ^
   drivers/net/ethernet/freescale/fec_ptp.c:383:17: error: use of undeclared identifier 'fep'
                   mutex_unlock(&fep->ptp_clk_mutex);
                                 ^
>> drivers/net/ethernet/freescale/fec_ptp.c:384:3: warning: misleading indentation; statement is not part of the previous 'if' [-Wmisleading-indentation]
                   return -EINVAL;
                   ^
   drivers/net/ethernet/freescale/fec_ptp.c:382:2: note: previous statement is here
           if (!adapter->ptp_clk_on)
           ^
   drivers/net/ethernet/freescale/fec_ptp.c:388:16: error: use of undeclared identifier 'fep'
           mutex_unlock(&fep->ptp_clk_mutex);
                         ^
   1 warning and 3 errors generated.

vim +/fep +380 drivers/net/ethernet/freescale/fec_ptp.c

   364	
   365	/**
   366	 * fec_ptp_gettime
   367	 * @ptp: the ptp clock structure
   368	 * @ts: timespec structure to hold the current time value
   369	 *
   370	 * read the timecounter and return the correct value on ns,
   371	 * after converting it into a struct timespec.
   372	 */
   373	static int fec_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
   374	{
   375		struct fec_enet_private *adapter =
   376		    container_of(ptp, struct fec_enet_private, ptp_caps);
   377		u64 ns;
   378		unsigned long flags;
   379	
 > 380		mutex_lock(&fep->ptp_clk_mutex);
   381		/* Check the ptp clock */
   382		if (!adapter->ptp_clk_on)
   383			mutex_unlock(&fep->ptp_clk_mutex);
 > 384			return -EINVAL;
   385		spin_lock_irqsave(&adapter->tmreg_lock, flags);
   386		ns = timecounter_read(&adapter->tc);
   387		spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
   388		mutex_unlock(&fep->ptp_clk_mutex);
   389	
   390		*ts = ns_to_timespec64(ns);
   391	
   392		return 0;
   393	}
   394	

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