[thierryreding:for-5.13/work 58/59] drivers/gpu/drm/i915/display/intel_dp_aux.c:703:1: error: non-void function does not return a value in all control paths

[thierryreding:for-5.13/work 58/59] drivers/gpu/drm/i915/display/intel_dp_aux.c:703:1: error: non-void function does not return a value in all control paths

[kernel test robot]

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tree:   https://github.com/thierryreding/linux for-5.13/work
head:   6faf2d6934c70d1786de0e373d178559f6eae8db
commit: 2c786365b87375c6e8dcd514d16aeccf98304377 [58/59] drm/dp: Move I2C adapter registration to drm_dp_aux_init()
config: x86_64-randconfig-a001-20210506 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8f5a2a5836cc8e4c1def2bdeb022e7b496623439)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/thierryreding/linux/commit/2c786365b87375c6e8dcd514d16aeccf98304377
        git remote add thierryreding https://github.com/thierryreding/linux
        git fetch --no-tags thierryreding for-5.13/work
        git checkout 2c786365b87375c6e8dcd514d16aeccf98304377
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 

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

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/i915/display/intel_dp_aux.c:703:1: error: non-void function does not return a value in all control paths [-Werror,-Wreturn-type]
   }
   ^
   1 error generated.


vim +703 drivers/gpu/drm/i915/display/intel_dp_aux.c

aa850fb1c8793ac Jani Nikula    2021-01-20  650  
2c786365b87375c Thierry Reding 2021-04-20  651  int intel_dp_aux_init(struct intel_dp *intel_dp)
aa850fb1c8793ac Jani Nikula    2021-01-20  652  {
aa850fb1c8793ac Jani Nikula    2021-01-20  653  	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
aa850fb1c8793ac Jani Nikula    2021-01-20  654  	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
aa850fb1c8793ac Jani Nikula    2021-01-20  655  	struct intel_encoder *encoder = &dig_port->base;
aa850fb1c8793ac Jani Nikula    2021-01-20  656  	enum aux_ch aux_ch = dig_port->aux_ch;
2c786365b87375c Thierry Reding 2021-04-20  657  	int ret;
aa850fb1c8793ac Jani Nikula    2021-01-20  658  
005e95377249cb6 Matt Roper     2021-03-19  659  	if (DISPLAY_VER(dev_priv) >= 12) {
aa850fb1c8793ac Jani Nikula    2021-01-20  660  		intel_dp->aux_ch_ctl_reg = tgl_aux_ctl_reg;
aa850fb1c8793ac Jani Nikula    2021-01-20  661  		intel_dp->aux_ch_data_reg = tgl_aux_data_reg;
005e95377249cb6 Matt Roper     2021-03-19  662  	} else if (DISPLAY_VER(dev_priv) >= 9) {
aa850fb1c8793ac Jani Nikula    2021-01-20  663  		intel_dp->aux_ch_ctl_reg = skl_aux_ctl_reg;
aa850fb1c8793ac Jani Nikula    2021-01-20  664  		intel_dp->aux_ch_data_reg = skl_aux_data_reg;
aa850fb1c8793ac Jani Nikula    2021-01-20  665  	} else if (HAS_PCH_SPLIT(dev_priv)) {
aa850fb1c8793ac Jani Nikula    2021-01-20  666  		intel_dp->aux_ch_ctl_reg = ilk_aux_ctl_reg;
aa850fb1c8793ac Jani Nikula    2021-01-20  667  		intel_dp->aux_ch_data_reg = ilk_aux_data_reg;
aa850fb1c8793ac Jani Nikula    2021-01-20  668  	} else {
aa850fb1c8793ac Jani Nikula    2021-01-20  669  		intel_dp->aux_ch_ctl_reg = g4x_aux_ctl_reg;
aa850fb1c8793ac Jani Nikula    2021-01-20  670  		intel_dp->aux_ch_data_reg = g4x_aux_data_reg;
aa850fb1c8793ac Jani Nikula    2021-01-20  671  	}
aa850fb1c8793ac Jani Nikula    2021-01-20  672  
005e95377249cb6 Matt Roper     2021-03-19  673  	if (DISPLAY_VER(dev_priv) >= 9)
aa850fb1c8793ac Jani Nikula    2021-01-20  674  		intel_dp->get_aux_clock_divider = skl_get_aux_clock_divider;
aa850fb1c8793ac Jani Nikula    2021-01-20  675  	else if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
aa850fb1c8793ac Jani Nikula    2021-01-20  676  		intel_dp->get_aux_clock_divider = hsw_get_aux_clock_divider;
aa850fb1c8793ac Jani Nikula    2021-01-20  677  	else if (HAS_PCH_SPLIT(dev_priv))
aa850fb1c8793ac Jani Nikula    2021-01-20  678  		intel_dp->get_aux_clock_divider = ilk_get_aux_clock_divider;
aa850fb1c8793ac Jani Nikula    2021-01-20  679  	else
aa850fb1c8793ac Jani Nikula    2021-01-20  680  		intel_dp->get_aux_clock_divider = g4x_get_aux_clock_divider;
aa850fb1c8793ac Jani Nikula    2021-01-20  681  
005e95377249cb6 Matt Roper     2021-03-19  682  	if (DISPLAY_VER(dev_priv) >= 9)
aa850fb1c8793ac Jani Nikula    2021-01-20  683  		intel_dp->get_aux_send_ctl = skl_get_aux_send_ctl;
aa850fb1c8793ac Jani Nikula    2021-01-20  684  	else
aa850fb1c8793ac Jani Nikula    2021-01-20  685  		intel_dp->get_aux_send_ctl = g4x_get_aux_send_ctl;
aa850fb1c8793ac Jani Nikula    2021-01-20  686  
2c786365b87375c Thierry Reding 2021-04-20  687  	ret = drm_dp_aux_init(&intel_dp->aux);
2c786365b87375c Thierry Reding 2021-04-20  688  	if (ret < 0)
2c786365b87375c Thierry Reding 2021-04-20  689  		return ret;
aa850fb1c8793ac Jani Nikula    2021-01-20  690  
aa850fb1c8793ac Jani Nikula    2021-01-20  691  	/* Failure to allocate our preferred name is not critical */
005e95377249cb6 Matt Roper     2021-03-19  692  	if (DISPLAY_VER(dev_priv) >= 12 && aux_ch >= AUX_CH_USBC1)
aa850fb1c8793ac Jani Nikula    2021-01-20  693  		intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX USBC%c/%s",
aa850fb1c8793ac Jani Nikula    2021-01-20  694  					       aux_ch - AUX_CH_USBC1 + '1',
aa850fb1c8793ac Jani Nikula    2021-01-20  695  					       encoder->base.name);
aa850fb1c8793ac Jani Nikula    2021-01-20  696  	else
aa850fb1c8793ac Jani Nikula    2021-01-20  697  		intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX %c/%s",
aa850fb1c8793ac Jani Nikula    2021-01-20  698  					       aux_ch_name(aux_ch),
aa850fb1c8793ac Jani Nikula    2021-01-20  699  					       encoder->base.name);
aa850fb1c8793ac Jani Nikula    2021-01-20  700  
aa850fb1c8793ac Jani Nikula    2021-01-20  701  	intel_dp->aux.transfer = intel_dp_aux_transfer;
aa850fb1c8793ac Jani Nikula    2021-01-20  702  	cpu_latency_qos_add_request(&intel_dp->pm_qos, PM_QOS_DEFAULT_VALUE);
aa850fb1c8793ac Jani Nikula    2021-01-20 @703  }

:::::: The code at line 703 was first introduced by commit
:::::: aa850fb1c8793ac6bce3ebf085e4bde9f1b45b4f drm/i915/dp: split out aux functionality to intel_dp_aux.c

:::::: TO: Jani Nikula <jani.nikula@intel.com>
:::::: CC: Jani Nikula <jani.nikula@intel.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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