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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-10-22 19:34:09 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-10-22 19:34:09 +0100 |
| commit | f20e3b5fe7ead0615309433260b9784d8da0bbbd (patch) | |
| tree | eabb2e47a0355ac4e8024b7087b4e7cb9f324358 /drivers/char/random.c | |
| parent | bcbfe664e7af019e698cef2feb85ac2b4f1ac11d (diff) | |
| parent | f030d7b65e4e6399f23de2a41a58d1b607b6bd89 (diff) | |
Merge branch 'for-rmk' of git://git.android.com/kernel into devel
Diffstat (limited to 'drivers/char/random.c')
| -rw-r--r-- | drivers/char/random.c | 36 |
1 files changed, 31 insertions, 5 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index c8752eaad48..705a839f179 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -558,9 +558,26 @@ struct timer_rand_state { unsigned dont_count_entropy:1; }; -static struct timer_rand_state input_timer_state; static struct timer_rand_state *irq_timer_state[NR_IRQS]; +static struct timer_rand_state *get_timer_rand_state(unsigned int irq) +{ + if (irq >= nr_irqs) + return NULL; + + return irq_timer_state[irq]; +} + +static void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state) +{ + if (irq >= nr_irqs) + return; + + irq_timer_state[irq] = state; +} + +static struct timer_rand_state input_timer_state; + /* * This function adds entropy to the entropy "pool" by using timing * delays. It uses the timer_rand_state structure to make an estimate @@ -648,11 +665,15 @@ EXPORT_SYMBOL_GPL(add_input_randomness); void add_interrupt_randomness(int irq) { - if (irq >= NR_IRQS || irq_timer_state[irq] == NULL) + struct timer_rand_state *state; + + state = get_timer_rand_state(irq); + + if (state == NULL) return; DEBUG_ENT("irq event %d\n", irq); - add_timer_randomness(irq_timer_state[irq], 0x100 + irq); + add_timer_randomness(state, 0x100 + irq); } #ifdef CONFIG_BLOCK @@ -912,7 +933,12 @@ void rand_initialize_irq(int irq) { struct timer_rand_state *state; - if (irq >= NR_IRQS || irq_timer_state[irq]) + if (irq >= nr_irqs) + return; + + state = get_timer_rand_state(irq); + + if (state) return; /* @@ -921,7 +947,7 @@ void rand_initialize_irq(int irq) */ state = kzalloc(sizeof(struct timer_rand_state), GFP_KERNEL); if (state) - irq_timer_state[irq] = state; + set_timer_rand_state(irq, state); } #ifdef CONFIG_BLOCK |