diff options
| author | Takashi Iwai <tiwai@suse.de> | 2023-06-13 14:22:40 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-06-13 15:15:00 +0300 |
| commit | 44e46572f0bae431a6092e3cfd2f47bff8b8d18c (patch) | |
| tree | 99f9198bd3d7c96e2291fd68d62e7f9fb45d72e1 /drivers/base | |
| parent | 0cc6578048e0980d254aee345130cced4912f723 (diff) | |
| download | linux-44e46572f0bae431a6092e3cfd2f47bff8b8d18c.tar.xz | |
regmap: regcache: Don't sync read-only registers
regcache_maple_sync() tries to sync all cached values no matter
whether it's writable or not. OTOH, regache_sync_val() does care the
wrtability and returns -EIO for a read-only register. This results in
an error message like:
snd_hda_codec_realtek hdaudioC0D0: Unable to sync register 0x2f0009. -5
and the sync loop is aborted incompletely.
This patch adds the writable register check to regcache_sync_val() for
addressing the bug above.
Note that, although we may add the check in the caller side
(regcache_maple_sync()), here we put in regcache_sync_val(), so that a
similar case like this can be avoided in future.
Fixes: f033c26de5a5 ("regmap: Add maple tree based register cache")
Link: https://lore.kernel.org/r/877cs7g6f1.wl-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20230613112240.3361-1-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regcache.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c index 029564695dbb..97c681fcf9f6 100644 --- a/drivers/base/regmap/regcache.c +++ b/drivers/base/regmap/regcache.c @@ -284,6 +284,9 @@ static bool regcache_reg_needs_sync(struct regmap *map, unsigned int reg, { int ret; + if (!regmap_writeable(map, reg)) + return false; + /* If we don't know the chip just got reset, then sync everything. */ if (!map->no_sync_defaults) return true; |