random: optimize spinlock use in add_device_randomness()

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The add_device_randomness() function calls mix_pool_bytes() twice for
the input pool and the non-blocking pool, for a total of four times.
By using _mix_pool_byte() and taking the spinlock in
add_device_randomness(), we can halve the number of times we need
take each pool's spinlock.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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Theodore Ts'o 2013-09-12 14:27:22 -04:00

parent 5910895f0e

commit 3ef4cb2d65

1 changed files with 10 additions and 4 deletions

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drivers/char/random.c

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