Hi Ryder,

[auto build test WARNING on tj-libata/for-next]
[also build test WARNING on v4.13-rc2 next-20170728]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ryder-Lee/Add-support-for-MediaTek-AHCI-SATA/20170728-164513
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tj/libata.git for-next
config: arm64-allyesconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm64 

All warnings (new ones prefixed by >>):

   drivers/ata/ahci_mtk.c: In function 'mtk_ahci_platform_resets':
>> drivers/ata/ahci_mtk.c:60:32: warning: comparison of constant '-517' with boolean expression is always false [-Wbool-compare]
     if (IS_ERR(drv_data->axi_rst) == -EPROBE_DEFER)
                                   ^~
   drivers/ata/ahci_mtk.c:64:31: warning: comparison of constant '-517' with boolean expression is always false [-Wbool-compare]
     if (IS_ERR(drv_data->sw_rst) == -EPROBE_DEFER)
                                  ^~
   drivers/ata/ahci_mtk.c:68:32: warning: comparison of constant '-517' with boolean expression is always false [-Wbool-compare]
     if (IS_ERR(drv_data->reg_rst) == -EPROBE_DEFER)
                                   ^~
>> drivers/ata/ahci_mtk.c:60:6: warning: ignoring return value of 'IS_ERR', declared with attribute warn_unused_result [-Wunused-result]
     if (IS_ERR(drv_data->axi_rst) == -EPROBE_DEFER)
         ^~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/ata/ahci_mtk.c:64:6: warning: ignoring return value of 'IS_ERR', declared with attribute warn_unused_result [-Wunused-result]
     if (IS_ERR(drv_data->sw_rst) == -EPROBE_DEFER)
         ^~~~~~~~~~~~~~~~~~~~~~~~
   drivers/ata/ahci_mtk.c:68:6: warning: ignoring return value of 'IS_ERR', declared with attribute warn_unused_result [-Wunused-result]
     if (IS_ERR(drv_data->reg_rst) == -EPROBE_DEFER)
         ^~~~~~~~~~~~~~~~~~~~~~~~~

vim +60 drivers/ata/ahci_mtk.c

    51	
    52	static int mtk_ahci_platform_resets(struct ahci_host_priv *hpriv,
    53					    struct device *dev)
    54	{
    55		struct mtk_ahci_drv_data *drv_data = hpriv->plat_data;
    56		int err;
    57	
    58		/* reset AXI bus and phy part */
    59		drv_data->axi_rst = devm_reset_control_get_optional(dev, "axi-rst");
  > 60		if (IS_ERR(drv_data->axi_rst) == -EPROBE_DEFER)
    61			return -EPROBE_DEFER;
    62	
    63		drv_data->sw_rst = devm_reset_control_get_optional(dev, "sw-rst");
    64		if (IS_ERR(drv_data->sw_rst) == -EPROBE_DEFER)
    65			return -EPROBE_DEFER;
    66	
    67		drv_data->reg_rst = devm_reset_control_get_optional(dev, "reg-rst");
    68		if (IS_ERR(drv_data->reg_rst) == -EPROBE_DEFER)
    69			return -EPROBE_DEFER;
    70	
    71		err = reset_control_assert(drv_data->axi_rst);
    72		if (err) {
    73			dev_err(dev, "assert axi bus failed\n");
    74			return err;
    75		}
    76	
    77		err = reset_control_assert(drv_data->sw_rst);
    78		if (err) {
    79			dev_err(dev, "assert phy digital part failed\n");
    80			return err;
    81		}
    82	
    83		err = reset_control_assert(drv_data->reg_rst);
    84		if (err) {
    85			dev_err(dev, "assert phy register part failed\n");
    86			return err;
    87		}
    88	
    89		err = reset_control_deassert(drv_data->reg_rst);
    90		if (err) {
    91			dev_err(dev, "deassert phy register part failed\n");
    92			return err;
    93		}
    94	
    95		err = reset_control_deassert(drv_data->sw_rst);
    96		if (err) {
    97			dev_err(dev, "deassert phy digital part failed\n");
    98			return err;
    99		}
   100	
   101		err = reset_control_deassert(drv_data->axi_rst);
   102		if (err) {
   103			dev_err(dev, "deassert axi bus failed\n");
   104			return err;
   105		}
   106	
   107		return 0;
   108	}
   109	

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