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random: do not take pool spinlock at boot 

Since rand_initialize() is run while interrupts are still off and
nothing else is running, we don't need to repeatedly take and release
the pool spinlock, especially in the RDSEED loop.

Reviewed-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2022-02-12 01:26:17 +01:00
parent 58340f8e95
commit afba0b80b9
1 changed files with 3 additions and 3 deletions
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6
drivers/char/random.c
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@ -978,10 +978,10 @@ int __init rand_initialize(void)
rv = random_get_entropy();
arch_init = false;
}
mix_pool_bytes(&rv, sizeof(rv));
_mix_pool_bytes(&rv, sizeof(rv));
}
mix_pool_bytes(&now, sizeof(now));
mix_pool_bytes(utsname(), sizeof(*(utsname())));
_mix_pool_bytes(&now, sizeof(now));
_mix_pool_bytes(utsname(), sizeof(*(utsname())));
extract_entropy(base_crng.key, sizeof(base_crng.key));
++base_crng.generation;