diff options
Diffstat (limited to 'arch/powerpc/kernel/irq.c')
| -rw-r--r-- | arch/powerpc/kernel/irq.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index ac4d291..6cb3fcd 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -893,10 +893,13 @@ unsigned int irq_radix_revmap_lookup(struct irq_host *host, return irq_find_mapping(host, hwirq); /* - * No rcu_read_lock(ing) needed, the ptr returned can't go under us - * as it's referencing an entry in the static irq_map table. + * The ptr returned references the static global irq_map. + * but freeing an irq can delete nodes along the path to + * do the lookup via call_rcu. */ + rcu_read_lock(); ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq); + rcu_read_unlock(); /* * If found in radix tree, then fine. |