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hw/intc: Add NULL pointer check on LoongArch ipi device
When ipi mailbox is used, cpu_index is decoded from iocsr register. cpu maybe does not exist. This patch adds NULL pointer check on ipi device. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Song Gao <gaosong@loongson.cn> Message-Id: <20230512100421.1867848-4-gaosong@loongson.cn>
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