On Thu, Aug 27 2020 at 09:17, Marc Zyngier wrote:
> On 2020-08-26 12:17, Thomas Gleixner wrote:
>> +void msi_domain_set_default_info_flags(struct msi_domain_info *info)
>> +{
>> +    /* Required so that a device latches a valid MSI message on startup 
>> */
>> +    info->flags |= MSI_FLAG_ACTIVATE_EARLY;
> As far as I remember the story behind this flag (it's been a while),
> it was working around a PCI-specific issue, hence being located in
> the PCI code.

Yes. Some cards misbehave when there is no valid message programmed and
MSI is enabled.

> Now, the "program the MSI before enabling it" concept makes sense no
> matter what bus this is on, and I wonder why we are even keeping this
> flag around.

> Can't we just drop it together with the check in
> msi_domain_alloc_irqs()?

I'm fine with that.


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