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of/irq: Avoid calling list_first_entry() for empty list

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list_first_entry() expects the list is not empty, we need to check if list is
empty before calling list_first_entry(). Thus use list_first_entry_or_null()
instead of list_first_entry().

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Axel Lin 2013-06-23 15:50:07 +08:00 committed by Grant Likely
parent cfd1ee3e37
commit c0cdfaa0a5
1 changed files with 3 additions and 2 deletions
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5
drivers/of/irq.c
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@ -482,8 +482,9 @@ void __init of_irq_init(const struct of_device_id *matches)
}
/* Get the next pending parent that might have children */
desc = list_first_entry(&intc_parent_list, typeof(*desc), list);
if (list_empty(&intc_parent_list) || !desc) {
desc = list_first_entry_or_null(&intc_parent_list,
typeof(*desc), list);
if (!desc) {
pr_err("of_irq_init: children remain, but no parents\n");
break;
}