diff options
Diffstat (limited to 'kernel/irq/irqdesc.c')
| -rw-r--r-- | kernel/irq/irqdesc.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index a250d3a0af12..6f6644f819dd 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -206,6 +206,14 @@ struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node) return NULL; } +static int irq_expand_nr_irqs(unsigned int cnt) +{ + if (nr_irqs + cnt > IRQ_BITMAP_BITS) + return -ENOMEM; + nr_irqs += cnt; + return 0; +} + int __init early_irq_init(void) { int i, initcnt, node = first_online_node; @@ -287,6 +295,12 @@ static inline int alloc_descs(unsigned int start, unsigned int cnt, int node) { return start; } + +static int irq_expand_nr_irqs(unsigned int cnt) +{ + return -ENOMEM; +} + #endif /* !CONFIG_SPARSE_IRQ */ /* Dynamic interrupt handling */ @@ -335,9 +349,11 @@ irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node) if (irq >=0 && start != irq) goto err; - ret = -ENOMEM; - if (start >= nr_irqs) - goto err; + if (start >= nr_irqs) { + ret = irq_expand_nr_irqs(cnt); + if (ret) + goto err; + } bitmap_set(allocated_irqs, start, cnt); mutex_unlock(&sparse_irq_lock); |