linux-kernel - [PATCH] crypto: qcom: add HW

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Message-Id: <20231016200324.757455-1-arnd@kernel.org>
Date:   Mon, 16 Oct 2023 22:02:57 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Om Prakash Singh <quic_omprsing@...cinc.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Bjorn Andersson <quic_bjorande@...cinc.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] crypto: qcom: add HW_RANDOM dependency

From: Arnd Bergmann <arnd@...db.de>

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@...db.de>
---
 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