[PATCH 5.15 102/121] ASoC: mchp-spdiftx: Fix clang -Wbitfield-constant-conversion

Greg Kroah-Hartman
2022-09-13T14:46:14Z

From: Nathan Chancellor <nathan@kernel.org>

commit 5c5c2baad2b55cc0a4b190266889959642298f79 upstream.

A recent change in clang strengthened its -Wbitfield-constant-conversion
to warn when 1 is assigned to a 1-bit signed integer bitfield, as it can
only be 0 or -1, not 1:

sound/soc/atmel/mchp-spdiftx.c:505:20: error: implicit truncation from 'int' to bit-field changes value from 1 to -1 [-Werror,-Wbitfield-constant-conversion]
dev->gclk_enabled = 1;
^ ~
1 error generated.

The actual value of the field is never checked, just that it is not
zero, so there is not a real bug here. However, it is simple enough to
silence the warning by making the bitfield unsigned, which matches the
mchp-spdifrx driver.

Fixes: 06ca24e98e6b ("ASoC: mchp-spdiftx: add driver for S/PDIF TX Controller")
Link: https://github.com/ClangBuiltLinux/linux/issues/1686
Link: https://github.com/llvm/llvm-project/commit/82afc9b169a67e8b8a1862fb9c41a2cd974d6691
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20220810010809.2024482-1-nathan@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
sound/soc/atmel/mchp-spdiftx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/soc/atmel/mchp-spdiftx.c
+++ b/sound/soc/atmel/mchp-spdiftx.c
@@ -196,7 +196,7 @@ struct mchp_spdiftx_dev {
struct clk *pclk;
struct clk *gclk;
unsigned int fmt;
- int gclk_enabled:1;
+ unsigned int gclk_enabled:1;
};

static inline int mchp_spdiftx_is_running(struct mchp_spdiftx_dev *dev)