2023-10-16 20:03:40

by Arnd Bergmann

Subject: [PATCH] crypto: qcom: add HW_RANDOM dependency

From: Arnd Bergmann <[email protected]>

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 <[email protected]>
---
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

2023-10-17 03:27:59

by Om Prakash Singh

Subject: Re: [PATCH] crypto: qcom: add HW_RANDOM dependency

On 10/17/2023 1:32 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <[email protected]>
>
> 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 <[email protected]>
> ---
Reviewed-by: Om Prakash Singh <[email protected]>

> 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

2023-10-17 07:13:47

by Neil Armstrong

Subject: Re: [PATCH] crypto: qcom: add HW_RANDOM dependency

On 16/10/2023 22:02, Arnd Bergmann wrote:
> From: Arnd Bergmann <[email protected]>
>
> 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 <[email protected]>
> ---
> 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

Reviewed-by: Neil Armstrong <[email protected]>