41 lines
1.2 KiB
Diff
41 lines
1.2 KiB
Diff
From: Ingo Molnar <mingo@elte.hu>
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Date: Fri, 3 Jul 2009 08:29:30 -0500
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Subject: drivers: random: Reduce preempt disabled region
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patches-3.12.0-rt2.tar.xz
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No need to keep preemption disabled across the whole function.
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Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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drivers/char/random.c | 9 +++++----
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1 file changed, 5 insertions(+), 4 deletions(-)
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--- a/drivers/char/random.c
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+++ b/drivers/char/random.c
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@@ -673,9 +673,12 @@ static void add_timer_randomness(struct
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preempt_disable();
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/* if over the trickle threshold, use only 1 in 4096 samples */
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if (input_pool.entropy_count > trickle_thresh &&
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- ((__this_cpu_inc_return(trickle_count) - 1) & 0xfff))
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- goto out;
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+ ((__this_cpu_inc_return(trickle_count) - 1) & 0xfff)) {
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+ preempt_enable();
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+ return;
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+ }
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+ preempt_enable();
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sample.jiffies = jiffies;
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sample.cycles = random_get_entropy();
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sample.num = num;
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@@ -716,8 +719,6 @@ static void add_timer_randomness(struct
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credit_entropy_bits(&input_pool,
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min_t(int, fls(delta>>1), 11));
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}
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-out:
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- preempt_enable();
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}
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void add_input_randomness(unsigned int type, unsigned int code,
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