linux-kernel - drivers/ptp/ptp_idt82p33.c:469:9: warning: Identical condition 'err', second condition is always false

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Date:   Sat, 8 Aug 2020 04:21:58 +0800
From:   kernel test robot <lkp@...el.com>
To:     Min Li <min.li.xe@...esas.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: drivers/ptp/ptp_idt82p33.c:469:9: warning: Identical condition
 'err', second condition is always false

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5631c5e0eb9035d92ceb20fcd9cdb7779a3f5cc7
commit: 57a10d8c1123068e3cb06434fbc9634f945d3062 ptp: Add a ptp clock driver for IDT 82P33 SMU.
date:   6 months ago
compiler: powerpc64-linux-gcc (GCC) 9.3.0

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


cppcheck warnings: (new ones prefixed by >>)

>> drivers/ptp/ptp_idt82p33.c:469:9: warning: Identical condition 'err', second condition is always false [identicalConditionAfterEarlyExit]
    return err;
           ^
   drivers/ptp/ptp_idt82p33.c:462:6: note: first condition
    if (err)
        ^
   drivers/ptp/ptp_idt82p33.c:469:9: note: second condition
    return err;
           ^

vim +/err +469 drivers/ptp/ptp_idt82p33.c

   440	
   441	static int idt82p33_measure_tod_write_overhead(struct idt82p33_channel *channel)
   442	{
   443		s64 trailing_overhead_ns, one_byte_write_ns, gap_ns;
   444		struct idt82p33 *idt82p33 = channel->idt82p33;
   445		int err;
   446	
   447		idt82p33->tod_write_overhead_ns = 0;
   448	
   449		err = idt82p33_measure_settime_gettime_gap_overhead(channel, &gap_ns);
   450	
   451		if (err)
   452			return err;
   453	
   454		err = idt82p33_measure_one_byte_write_overhead(channel,
   455							       &one_byte_write_ns);
   456	
   457		if (err)
   458			return err;
   459	
   460		err = idt82p33_measure_tod_write_9_byte_overhead(channel);
   461	
   462		if (err)
   463			return err;
   464	
   465		trailing_overhead_ns = gap_ns - (2 * one_byte_write_ns);
   466	
   467		idt82p33->tod_write_overhead_ns -= trailing_overhead_ns;
   468	
 > 469		return err;
   470	}
   471	

---
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