diff options
| -rw-r--r-- | drivers/char/random.c | 66 | ||||
| -rw-r--r-- | include/linux/irq.h | 2 |
2 files changed, 63 insertions, 5 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 1610aa64c7cf..60c9c7ee6b2c 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -558,7 +558,7 @@ struct timer_rand_state { unsigned dont_count_entropy:1; }; -static struct timer_rand_state input_timer_state; +#ifndef CONFIG_HAVE_SPARSE_IRQ #ifdef CONFIG_HAVE_DYN_ARRAY static struct timer_rand_state **irq_timer_state; @@ -567,6 +567,51 @@ DEFINE_DYN_ARRAY(irq_timer_state, sizeof(struct timer_rand_state *), nr_irqs, PA static struct timer_rand_state *irq_timer_state[NR_IRQS]; #endif +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; +} + +#else + +static struct timer_rand_state *get_timer_rand_state(unsigned int irq) +{ + struct irq_desc *desc; + + desc = irq_to_desc(irq); + + if (!desc) + return NULL; + + return desc->timer_rand_state; +} + +static void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state) +{ + struct irq_desc *desc; + + desc = irq_to_desc(irq); + + if (!desc) + return; + + desc->timer_rand_state = state; +} +#endif + +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 @@ -654,11 +699,15 @@ 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 @@ -918,7 +967,14 @@ void rand_initialize_irq(int irq) { struct timer_rand_state *state; - if (irq >= nr_irqs || irq_timer_state[irq]) +#ifndef CONFIG_HAVE_SPARSE_IRQ + if (irq >= nr_irqs) + return; +#endif + + state = get_timer_rand_state(irq); + + if (state) return; /* @@ -927,7 +983,7 @@ 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 diff --git a/include/linux/irq.h b/include/linux/irq.h index 80b8200f2adb..60c856aaac0f 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -127,6 +127,7 @@ struct irq_chip { const char *typename; }; +struct timer_rand_state; /** * struct irq_desc - interrupt descriptor * @@ -155,6 +156,7 @@ struct irq_desc { unsigned int irq; #ifdef CONFIG_HAVE_SPARSE_IRQ struct irq_desc *next; + struct timer_rand_state *timer_rand_state; #endif irq_flow_handler_t handle_irq; struct irq_chip *chip; |