[PATCH] regmap: use int type to store negative error codes

[PATCH] regmap: use int type to store negative error codes

[Qianfeng Rong]

Change the 'ret' variable from unsigned int to int to store negative error
codes or zero returned by regmap_field_read() and regmap_read(), and change
'-1' to 'negative errno' in the comments.

Storing the negative error codes in unsigned type, doesn't cause an issue
at runtime but it's ugly as pants. Additionally, assigning negative error
codes to unsigned type may trigger a GCC warning when the -Wsign-conversion
flag is enabled.

No effect on runtime.

Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
---
 drivers/base/regmap/regmap.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 6883e1a43fe5..ce9be3989a21 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2258,12 +2258,14 @@ EXPORT_SYMBOL_GPL(regmap_field_update_bits_base);
  * @field: Register field to operate on
  * @bits: Bits to test
  *
- * Returns -1 if the underlying regmap_field_read() fails, 0 if at least one of the
- * tested bits is not set and 1 if all tested bits are set.
+ * Returns negative errno if the underlying regmap_field_read() fails,
+ * 0 if at least one of the tested bits is not set and 1 if all tested
+ * bits are set.
  */
 int regmap_field_test_bits(struct regmap_field *field, unsigned int bits)
 {
-	unsigned int val, ret;
+	unsigned int val;
+	int ret;
 
 	ret = regmap_field_read(field, &val);
 	if (ret)
@@ -3309,7 +3311,8 @@ EXPORT_SYMBOL_GPL(regmap_update_bits_base);
  */
 int regmap_test_bits(struct regmap *map, unsigned int reg, unsigned int bits)
 {
-	unsigned int val, ret;
+	unsigned int val;
+	int ret;
 
 	ret = regmap_read(map, reg, &val);
 	if (ret)
-- 
2.34.1

Re: [PATCH] regmap: use int type to store negative error codes

[Mark Brown]

On Thu, 28 Aug 2025 23:07:01 +0800, Qianfeng Rong wrote:
> Change the 'ret' variable from unsigned int to int to store negative error
> codes or zero returned by regmap_field_read() and regmap_read(), and change
> '-1' to 'negative errno' in the comments.
> 
> Storing the negative error codes in unsigned type, doesn't cause an issue
> at runtime but it's ugly as pants. Additionally, assigning negative error
> codes to unsigned type may trigger a GCC warning when the -Wsign-conversion
> flag is enabled.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git for-next

Thanks!

[1/1] regmap: use int type to store negative error codes
      commit: f4672dc6e9c07643c8c755856ba8e9eb9ca95d0c

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark