ASoC: codes: src4xxx: Avoid clang -Wsometimes-uninitialized in src4xxx_hw_params()

Clang warns:

  sound/soc/codecs/src4xxx.c:280:3: error: variable 'd' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
                  default:
                  ^~~~~~~
  sound/soc/codecs/src4xxx.c:298:59: note: uninitialized use occurs here
                  ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_11, d);
                                                                          ^
  sound/soc/codecs/src4xxx.c:223:20: note: initialize the variable 'd' to silence this warning
          int val, pj, jd, d;
                            ^
                            = 0
  sound/soc/codecs/src4xxx.c:280:3: error: variable 'jd' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
                  default:
                  ^~~~~~~
  sound/soc/codecs/src4xxx.c:293:59: note: uninitialized use occurs here
                  ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_10, jd);
                                                                          ^~
  sound/soc/codecs/src4xxx.c:223:17: note: initialize the variable 'jd' to silence this warning
          int val, pj, jd, d;
                        ^
                          = 0
  sound/soc/codecs/src4xxx.c:280:3: error: variable 'pj' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
                  default:
                  ^~~~~~~
  sound/soc/codecs/src4xxx.c:288:59: note: uninitialized use occurs here
                  ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_0F, pj);
                                                                          ^~
  sound/soc/codecs/src4xxx.c:223:13: note: initialize the variable 'pj' to silence this warning
          int val, pj, jd, d;
                    ^
                      = 0
  3 errors generated.

The datasheet does not have any default values for these regmap values
so pick some arbitrary values and print to the user that this is the
case to silence the warnings.

Link: https://github.com/ClangBuiltLinux/linux/issues/1691
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@gmail.com>
Suggested-by: Matt Flax <flatmax@flatmax.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Matt Flax <flatmax@flatmax.com>
Link: https://lore.kernel.org/r/20220823151939.2493697-1-nathan@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/src4xxx.c b/sound/soc/codecs/src4xxx.c
index a8f1430..db4e280 100644 (file)
--- a/sound/soc/codecs/src4xxx.c
+++ b/sound/soc/codecs/src4xxx.c
@@ -280,9 +280,14 @@ static int src4xxx_hw_params(struct snd_pcm_substream *substream,
                default:
                        /* don't error out here,
                         * other parts of the chip are still functional
+                        * Dummy initialize variables to avoid
+                        * -Wsometimes-uninitialized from clang.
                         */
                        dev_info(component->dev,
-                               "Couldn't set the RCV PLL as this master clock rate is unknown\n");
+                               "Couldn't set the RCV PLL as this master clock rate is unknown. Chosen regmap values may not match real world values.\n");
+                       pj = 0x0;
+                       jd = 0xff;
+                       d = 0xff;
                        break;
                }
                ret = regmap_write(src4xxx->regmap, SRC4XXX_RCV_PLL_0F, pj);