regmap: fix bogus error on regcache_sync success

commit fea88064445a59584460f7f67d102b6e5fc1ca1d upstream.

Since commit 0ec7731655de ("regmap: Ensure range selector registers
are updated after cache sync") opening pcm512x based soundcards fail
with EINVAL and dmesg shows sync cache and pm_runtime_get errors:

[  228.794676] pcm512x 1-004c: Failed to sync cache: -22
[  228.794740] pcm512x 1-004c: ASoC: error at snd_soc_pcm_component_pm_runtime_get on pcm512x.1-004c: -22

This is caused by the cache check result leaking out into the
regcache_sync return value.

Fix this by making the check local-only, as the comment above the
regcache_read call states a non-zero return value means there's
nothing to do so the return value should not be altered.

Fixes: 0ec7731655de ("regmap: Ensure range selector registers are updated after cache sync")
Cc: stable@vger.kernel.org
Signed-off-by: Matthias Reichl <hias@horus.com>
Link: https://lore.kernel.org/r/20231203222216.96547-1-hias@horus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 92592f9..ac63a73 100644 (file)
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -410,8 +410,7 @@ out:
                        rb_entry(node, struct regmap_range_node, node);
 
                /* If there's nothing in the cache there's nothing to sync */
-               ret = regcache_read(map, this->selector_reg, &i);
-               if (ret != 0)
+               if (regcache_read(map, this->selector_reg, &i) != 0)
                        continue;
 
                ret = _regmap_write(map, this->selector_reg, i);