linux-kernel - [PATCH] regmap: kunit: fix raw noinc write test wrapping

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Message-ID: <20240206151004.1636761-2-ben.wolsieffer@hefring.com>
Date: Tue,  6 Feb 2024 10:10:05 -0500
From: Ben Wolsieffer <ben.wolsieffer@...ring.com>
To: linux-kernel@...r.kernel.org
Cc: Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Ben Wolsieffer <ben.wolsieffer@...ring.com>
Subject: [PATCH] regmap: kunit: fix raw noinc write test wrapping

The raw noinc write test places a known value in the register following
the noinc register to verify that it is not disturbed by the noinc
write. This test ensures this value is distinct by adding 100 to the
second element of the noinc write data.

The regmap registers are 16-bit, while the test value is stored in an
unsigned int. Therefore, adding 100 may cause the register to wrap while
the test value does not, causing the test to fail. This patch fixes this
by changing val_test and val_last from unsigned int to u16.

Signed-off-by: Ben Wolsieffer <ben.wolsieffer@...ring.com>
Reported-by: Guenter Roeck <linux@...ck-us.net>
Closes: https://lore.kernel.org/linux-kernel/745d3a11-15bc-48b6-84c8-c8761c943bed@roeck-us.net/T/
---
 drivers/base/regmap/regmap-kunit.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap-kunit.c b/drivers/base/regmap/regmap-kunit.c
index 026bdcb45127..4eb18f5d3265 100644
--- a/drivers/base/regmap/regmap-kunit.c
+++ b/drivers/base/regmap/regmap-kunit.c
@@ -1202,7 +1202,8 @@ static void raw_noinc_write(struct kunit *test)
 	struct regmap *map;
 	struct regmap_config config;
 	struct regmap_ram_data *data;
-	unsigned int val, val_test, val_last;
+	unsigned int val;
+	u16 val_test, val_last;
 	u16 val_array[BLOCK_TEST_SIZE];
 
 	config = raw_regmap_config;
-- 
2.43.0