From: Jason A. Donenfeld Jason@zx2c4.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@vger.kernel.org # v3.13+ Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com Reviewed-by: Christophe Leroy christophe.leroy@csgroup.eu Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20220611151015.548325-4-Jason@zx2c4.com Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/platforms/pseries/pseries.h | 2 ++ arch/powerpc/platforms/pseries/rng.c | 11 +++-------- arch/powerpc/platforms/pseries/setup.c | 2 ++ 3 files changed, 7 insertions(+), 8 deletions(-)
--- a/arch/powerpc/platforms/pseries/pseries.h +++ b/arch/powerpc/platforms/pseries/pseries.h @@ -121,4 +121,6 @@ void pseries_lpar_read_hblkrm_characteri static inline void pseries_lpar_read_hblkrm_characteristics(void) { } #endif
+void pseries_rng_init(void); + #endif /* _PSERIES_PSERIES_H */ --- a/arch/powerpc/platforms/pseries/rng.c +++ b/arch/powerpc/platforms/pseries/rng.c @@ -10,6 +10,7 @@ #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) @@ -24,19 +25,13 @@ 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 @@ -852,6 +852,8 @@ static void __init pSeries_setup_arch(vo
if (swiotlb_force == SWIOTLB_FORCE) ppc_swiotlb_enable = 1; + + pseries_rng_init(); }
static void pseries_panic(char *str)