linux-kernel - [PATCH v2 3/3] powerpc/pseries: wire up rng during setup

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Message-Id: <20220611100447.5066-4-Jason@zx2c4.com>
Date:   Sat, 11 Jun 2022 12:04:47 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>, stable@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>
Subject: [PATCH v2 3/3] powerpc/pseries: wire up rng during setup_arch

The platform's RNG must be available before random_init() in order to be
useful for initial seeding, which in turn means that it needs to be
called from setup_arch(), rather than from an init call. Fortunately,
each platform already has a setup_arch function pointer, which means
it's easy to wire this up for each of the three platforms that have an
RNG. This commit also removes some noisy log messages that don't add
much.

Cc: stable@...r.kernel.org
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>
Fixes: a489043f4626 ("powerpc/pseries: Implement arch_get_random_long() based on H_RANDOM")
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 arch/powerpc/platforms/pseries/rng.c   | 11 ++---------
 arch/powerpc/platforms/pseries/setup.c |  3 +++
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/rng.c b/arch/powerpc/platforms/pseries/rng.c
index 6268545947b8..d39bfce39aa1 100644
--- a/arch/powerpc/platforms/pseries/rng.c
+++ b/arch/powerpc/platforms/pseries/rng.c
@@ -24,19 +24,12 @@ static int pseries_get_random_long(unsigned long *v)
 	return 0;
 }
 
-static __init int rng_init(void)
+__init void pseries_rng_init(void)
 {
 	struct device_node *dn;
-
 	dn = of_find_compatible_node(NULL, NULL, "ibm,random");
 	if (!dn)
-		return -ENODEV;
-
-	pr_info("Registering arch random hook.\n");
-
+		return;
 	ppc_md.get_random_seed = pseries_get_random_long;
-
 	of_node_put(dn);
-	return 0;
 }
-machine_subsys_initcall(pseries, rng_init);
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index afb074269b42..7f3ee2658163 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -779,6 +779,8 @@ static resource_size_t pseries_pci_iov_resource_alignment(struct pci_dev *pdev,
 }
 #endif
 
+__init void pseries_rng_init(void);
+
 static void __init pSeries_setup_arch(void)
 {
 	set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
@@ -839,6 +841,7 @@ static void __init pSeries_setup_arch(void)
 	}
 
 	ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
+	pseries_rng_init();
 }
 
 static void pseries_panic(char *str)
-- 
2.35.1