在 2023/7/12 16:56, Marc Zyngier 写道:
> On Tue, 11 Jul 2023 13:08:06 +0100,
> Bibo Mao <maobibo@xxxxxxxxxxx> wrote:
>>
>> Return value of function eiointc_index is int, however it is converted
>> into uint32_t and then compared smaller than zero. This causes logic
>> problem. There is eioint initialization problem on qemu virt-machine
>> where there is only one eioint node and more than 4 vcpus. Nodemap of
>> eioint is 1, and external device intr can only be routed to vcpu 0-3, the
>> other vcpus can not response any external device interrupts and only local
>> processor interrupts like ipi/timer can work.
>>
>> Signed-off-by: Bibo Mao <maobibo@xxxxxxxxxxx>
>> ---
>> drivers/irqchip/irq-loongson-eiointc.c | 12 +++++++-----
>> 1 file changed, 7 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
>> index 92d8aa28bdf5..1c5a5b59f199 100644
>> --- a/drivers/irqchip/irq-loongson-eiointc.c
>> +++ b/drivers/irqchip/irq-loongson-eiointc.c
>> @@ -144,12 +144,14 @@ static int eiointc_router_init(unsigned int cpu)
>> int i, bit;
>> uint32_t data;
>> uint32_t node = cpu_to_eio_node(cpu);
>> - uint32_t index = eiointc_index(node);
>> + int index = eiointc_index(node);
>>
>> - if (index < 0) {
>> - pr_err("Error: invalid nodemap!\n");
>> - return -1;
>> - }
>> + /*
>> + * qemu virt-machine has only one eio intc and more than four cpus
>> + * irq from eio can only be routed to cpu 0-3 on virt machine
>> + */
>> + if (index < 0)
>> + return 0;
>>
>> if ((cpu_logical_map(cpu) % CORES_PER_EIO_NODE) == 0) {
>> eiointc_enable();
>
> This sort of thing really needs a Fixes: tag.
Sure, will add Fixes tag.
I am a newbie to lkml, thanks for kindly pointing it out :)
Regards
Bibo Mao
>
> Thanks,
>
> M.
>
