Le 11/06/2022 à 17:10, Jason A. Donenfeld a écrit :
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.
Cc: stable@vger.kernel.org Cc: Michael Ellerman mpe@ellerman.id.au Cc: Christophe Leroy christophe.leroy@csgroup.eu Fixes: a4da0d50b2a0 ("powerpc: Implement arch_get_random_long/int() for powernv") Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com
Reviewed-by: Christophe Leroy christophe.leroy@csgroup.eu
arch/powerpc/platforms/powernv/powernv.h | 2 ++ arch/powerpc/platforms/powernv/rng.c | 18 +++++------------- arch/powerpc/platforms/powernv/setup.c | 2 ++ 3 files changed, 9 insertions(+), 13 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/powernv.h b/arch/powerpc/platforms/powernv/powernv.h index e297bf4abfcb..fd3f5e1eb10b 100644 --- a/arch/powerpc/platforms/powernv/powernv.h +++ b/arch/powerpc/platforms/powernv/powernv.h @@ -42,4 +42,6 @@ ssize_t memcons_copy(struct memcons *mc, char *to, loff_t pos, size_t count); u32 __init memcons_get_size(struct memcons *mc); struct memcons *__init memcons_init(struct device_node *node, const char *mc_prop_name); +void powernv_rng_init(void);
- #endif /* _POWERNV_H */
diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index e3d44b36ae98..c86bf097e407 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -17,6 +17,7 @@ #include <asm/prom.h> #include <asm/machdep.h> #include <asm/smp.h> +#include "powernv.h" #define DARN_ERR 0xFFFFFFFFFFFFFFFFul @@ -84,24 +85,20 @@ static int powernv_get_random_darn(unsigned long *v) return 1; } -static int __init initialise_darn(void) +static void __init initialise_darn(void) { unsigned long val; int i; if (!cpu_has_feature(CPU_FTR_ARCH_300))
return -ENODEV;
return;for (i = 0; i < 10; i++) { if (powernv_get_random_darn(&val)) { ppc_md.get_random_seed = powernv_get_random_darn;
return 0;
return;
- pr_warn("Unable to use DARN for get_random_seed()\n");
- return -EIO; }
int powernv_get_random_long(unsigned long *v) @@ -163,14 +160,12 @@ static __init int rng_create(struct device_node *dn) rng_init_per_cpu(rng, dn);
- pr_info_once("Registering arch random hook.\n");
- ppc_md.get_random_seed = powernv_get_random_long;
return 0; } -static __init int rng_init(void) +void __init powernv_rng_init(void) { struct device_node *dn; int rc; @@ -188,7 +183,4 @@ static __init int rng_init(void) } initialise_darn();
- return 0; }
-machine_subsys_initcall(powernv, rng_init); diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c index 824c3ad7a0fa..a5fcb6796b22 100644 --- a/arch/powerpc/platforms/powernv/setup.c +++ b/arch/powerpc/platforms/powernv/setup.c @@ -203,6 +203,8 @@ static void __init pnv_setup_arch(void) pnv_check_guarded_cores(); /* XXX PMCS */
- powernv_rng_init(); }
static void __init pnv_init(void)