[PATCH] firmware: cs_dsp: FW_CS_DSP_KUNIT_TEST should not select REGMAP

[Geert Uytterhoeven]

Enabling a (modular) test should not silently enable additional kernel
functionality, as that may increase the attack vector of a product.

Fix this by making FW_CS_DSP_KUNIT_TEST (and FW_CS_DSP_KUNIT_TEST_UTILS)
depend on REGMAP instead of selecting it.

After this, one can safely enable CONFIG_KUNIT_ALL_TESTS=m to build
modules for all appropriate tests for ones system, without pulling in
extra unwanted functionality, while still allowing a tester to manually
enable REGMAP_BUILD and this test suite on a system where REGMAP is not
enabled by default.

Fixes: dd0b6b1f29b92202 ("firmware: cs_dsp: Add KUnit testing of bin file download")
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
See also commits 70a640c0efa76674 ("regmap: REGMAP_KUNIT should not
select REGMAP") and 47ee108a113c72e ("regmap: Provide user selectable
option to enable regmap").

BTW, what's the point in having separate FW_CS_DSP_KUNIT_TEST and
FW_CS_DSP_KUNIT_TEST_UTILS symbols?  They are always enabled or disabled
together.
---
 drivers/firmware/cirrus/Kconfig | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/cirrus/Kconfig b/drivers/firmware/cirrus/Kconfig
index ee09269c63b51173..0a883091259a2c11 100644
--- a/drivers/firmware/cirrus/Kconfig
+++ b/drivers/firmware/cirrus/Kconfig
@@ -6,15 +6,13 @@ config FW_CS_DSP
 
 config FW_CS_DSP_KUNIT_TEST_UTILS
 	tristate
-	depends on KUNIT
-	select REGMAP
+	depends on KUNIT && REGMAP
 	select FW_CS_DSP
 
 config FW_CS_DSP_KUNIT_TEST
 	tristate "KUnit tests for Cirrus Logic cs_dsp" if !KUNIT_ALL_TESTS
-	depends on KUNIT
+	depends on KUNIT && REGMAP
 	default KUNIT_ALL_TESTS
-	select REGMAP
 	select FW_CS_DSP
 	select FW_CS_DSP_KUNIT_TEST_UTILS
 	help
-- 
2.43.0