linux-kernel - [PATCH 1/2] regmap: Disable locking for RBTREE and MAPLE unit tests

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Message-Id: <20230720032848.1306349-1-linux@roeck-us.net>
Date:   Wed, 19 Jul 2023 20:28:47 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Mark Brown <broonie@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 1/2] regmap: Disable locking for RBTREE and MAPLE unit tests

REGCACHE_RBTREE and REGCACHE_MAPLE dynamically allocate memory
for regmap operations. This is incompatible with spinlock based locking
which is used for fast_io operations. Disable locking for the associated
unit tests to avoid lockdep splashes.

Fixes: f033c26de5a5 ("regmap: Add maple tree based register cache")
Fixes: 2238959b6ad2 ("regmap: Add some basic kunit tests")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/base/regmap/regmap-kunit.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/base/regmap/regmap-kunit.c b/drivers/base/regmap/regmap-kunit.c
index 24257aa9004d..9ff3018a46aa 100644
--- a/drivers/base/regmap/regmap-kunit.c
+++ b/drivers/base/regmap/regmap-kunit.c
@@ -58,6 +58,9 @@ static struct regmap *gen_regmap(struct regmap_config *config,
 	int i;
 	struct reg_default *defaults;
 
+	config->disable_locking = config->cache_type == REGCACHE_RBTREE ||
+					config->cache_type == REGCACHE_MAPLE;
+
 	buf = kmalloc(size, GFP_KERNEL);
 	if (!buf)
 		return ERR_PTR(-ENOMEM);
@@ -889,6 +892,8 @@ static struct regmap *gen_raw_regmap(struct regmap_config *config,
 
 	config->cache_type = test_type->cache_type;
 	config->val_format_endian = test_type->val_endian;
+	config->disable_locking = config->cache_type == REGCACHE_RBTREE ||
+					config->cache_type == REGCACHE_MAPLE;
 
 	buf = kmalloc(size, GFP_KERNEL);
 	if (!buf)
-- 
2.39.2