kernel/irq/irqdomain.c: before use 'irq_data', need check it whether valid.
Since irq_data may be NULL, if so, we WARN_ON(), and continue, 'hwirq' which related with 'irq_data' has to initialize later, or it will cause issue. Signed-off-by: NChen Gang <gang.chen@asianux.com> Signed-off-by: NGrant Likely <grant.likely@linaro.org>
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