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path: root/drivers/char/random.c
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Diffstat (limited to 'drivers/char/random.c')
-rw-r--r--drivers/char/random.c36
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