Re: [PATCH 2/2] PCI/MSI: Update MSI-X irq domain hwsize

[Guixin Liu]

在 2026/3/24 21:59, Thomas Gleixner 写道:
> On Tue, Mar 24 2026 at 09:47, Guixin Liu wrote:
> > After the upper-layer driver removes the device and before the next
> > probe, events such as firmware updates may increase the number of
> > interrupts supported by the device. However, the irq_domain still
> > retains the old hwsize, which causes subsequent interrupt allocation
> > failures. Update hwsize during MSI-X device domain setup to fix this
> > issue.
> When a device is removed then the corresponding struct device is torn
> down, which implies that the device domain is freed as well. So how can
> this end up with the old state on the next probe?
>
> Thanks,
>
>          tglx
Hi, My description was a bit ambiguous. The msi_device_data_release()
path to remove the irq_domain is only triggered when the device is
removed at the PCI layer. If only the upper-layer driver unbinds,
this path will not be reached.

Best Regards,
Guixin Liu