Messages in this thread |  | | From | Andy Shevchenko <> | Date | Thu, 21 Oct 2021 12:42:05 +0300 | Subject | Re: [PATCH V6] gpio: virtio: Add IRQ support |
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On Thu, Oct 21, 2021 at 7:34 AM Viresh Kumar <viresh.kumar@linaro.org> wrote: > On 20-10-21, 18:10, Andy Shevchenko wrote: > > On Wednesday, October 20, 2021, Viresh Kumar <viresh.kumar@linaro.org> > > wrote:
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> > > + case IRQ_TYPE_NONE: > > > + type = VIRTIO_GPIO_IRQ_TYPE_NONE; > > > + break; > > > > IIRC you add dead code. IRQ framework never calls this if type is not set. > > Yes, but it is allowed to call > > irq_set_irq_type(irq, IRQ_TYPE_NONE); > > and the irq framework won't disallow it AFAICT.
That's true, but how you may end up in this callback with a such? What the meaning of that call to the user?
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> > > struct virtio_gpio_config { > > > __le16 ngpio; > > > __u8 padding[2]; > > > @@ -44,4 +56,17 @@ struct virtio_gpio_response_get_names { > > > __u8 value[]; > > > }; > > > > > > +/* Virtio GPIO IRQ Request / Response */ > > > +struct virtio_gpio_irq_request { > > > + __le16 gpio; > > > +}; > > > + > > > +struct virtio_gpio_irq_response { > > > + __u8 status; > > > +}; > > > > > I’m wondering if those above should be packed. > > You are talking about the newly added ones or the ones before ? > > In any case, they are all already packed (i.e. they have explicit > padding wherever required) and properly aligned. Compiler won't add > any other padding to them.
Is it only for 64-bit to 64-bit communications? If there is a possibility to have 32-bit to 64-bit or vice versa communication you have a problem.
-- With Best Regards, Andy Shevchenko
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