linux-kernel - [PATCH 4.14 30/35] powerpc/pseries: wire up rng during setup

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Message-Id: <20220630133233.325811539@linuxfoundation.org>
Date:   Thu, 30 Jun 2022 15:46:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Jason A. Donenfeld" <Jason@...c4.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.14 30/35] powerpc/pseries: wire up rng during setup_arch()

From: Jason A. Donenfeld <Jason@...c4.com>

commit e561e472a3d441753bd012333b057f48fef1045b upstream.

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. This commit also removes some noisy log
messages that don't add much.

Fixes: a489043f4626 ("powerpc/pseries: Implement arch_get_random_long() based on H_RANDOM")
Cc: stable@...r.kernel.org # v3.13+
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20220611151015.548325-4-Jason@zx2c4.com
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/powerpc/platforms/pseries/pseries.h |    2 ++
 arch/powerpc/platforms/pseries/rng.c     |   11 +++--------
 arch/powerpc/platforms/pseries/setup.c   |    1 +
 3 files changed, 6 insertions(+), 8 deletions(-)

--- a/arch/powerpc/platforms/pseries/pseries.h
+++ b/arch/powerpc/platforms/pseries/pseries.h
@@ -102,4 +102,6 @@ int dlpar_workqueue_init(void);
 
 void pseries_setup_rfi_flush(void);
 
+void pseries_rng_init(void);
+
 #endif /* _PSERIES_PSERIES_H */
--- a/arch/powerpc/platforms/pseries/rng.c
+++ b/arch/powerpc/platforms/pseries/rng.c
@@ -14,6 +14,7 @@
 #include <asm/archrandom.h>
 #include <asm/machdep.h>
 #include <asm/plpar_wrappers.h>
+#include "pseries.h"
 
 
 static int pseries_get_random_long(unsigned long *v)
@@ -28,19 +29,13 @@ static int pseries_get_random_long(unsig
 	return 0;
 }
 
-static __init int rng_init(void)
+void __init 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);
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -594,6 +594,7 @@ static void __init pSeries_setup_arch(vo
 	}
 
 	ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
+	pseries_rng_init();
 }
 
 static int __init pSeries_init_panel(void)