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random: avoid checking crng_ready() twice in random_init()

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commit 9b29b6b203 upstream.

The current flow expands to:

    if (crng_ready())
       ...
    else if (...)
        if (!crng_ready())
            ...

The second crng_ready() call is redundant, but can't so easily be
optimized out by the compiler.

This commit simplifies that to:

    if (crng_ready()
        ...
    else if (...)
        ...

Fixes: 560181c27b ("random: move initialization functions out of hot pages")
Cc: stable@vger.kernel.org
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason A. Donenfeld
2022-06-07 09:44:07 +02:00
committed by Chris
parent 7add6cb865
commit 69251093ef
1 changed files with 1 additions and 1 deletions
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2
drivers/char/random.c
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@@ -835,7 +835,7 @@ int __init random_init(const char *command_line)
if (crng_ready())
crng_reseed();
else if (trust_cpu)
credit_init_bits(arch_bytes * 8);
_credit_init_bits(arch_bytes * 8);
return 0;
}