[PATCH] crypto: qcom: add HW_RANDOM dependency

[Arnd Bergmann]

From: Arnd Bergmann <arnd@xxxxxxxx>

The driver now calls into the hwrng subsystem and causes a link failure if that
is not reachable:

x86_64-linux-ld: vmlinux.o: in function `qcom_rng_probe':
qcom-rng.c:(.text+0xfefc7e): undefined reference to `devm_hwrng_register'

Add a Kconfig dependency as we have for the pure hw_random drivers. I see
that there are some other crypto drivers that instead use 'select HW_RANDOM',
but those seem to be mistakes as that may lead to circular dependencies,
and a simple driver should not force-enable an entire subsytem.

Fixes: f29cd5bb64c25 ("crypto: qcom-rng - Add hw_random interface support")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 drivers/crypto/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index c761952f0dc6d..79c3bb9c99c3b 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -601,6 +601,7 @@ config CRYPTO_DEV_QCE_SW_MAX_LEN
 config CRYPTO_DEV_QCOM_RNG
 	tristate "Qualcomm Random Number Generator Driver"
 	depends on ARCH_QCOM || COMPILE_TEST
+	depends on HW_RANDOM
 	select CRYPTO_RNG
 	help
 	  This driver provides support for the Random Number
-- 
2.39.2