Re: [PATCH RESEND] misc: pci_endpoint_test: Defer IRQ allocation until ioctl(PCITEST_SET_IRQTYPE)

[Bjorn Helgaas <helgaas@kernel.org>]

On Sun, Apr 20, 2025 at 09:31:46AM +0530, Manivannan Sadhasivam wrote:
> On Wed, 16 Apr 2025 16:28:26 +0200, Niklas Cassel wrote:
> > Commit a402006d48a9 ("misc: pci_endpoint_test: Remove global 'irq_type'
> > and 'no_msi'") changed so that the default IRQ vector requested by
> > pci_endpoint_test_probe() was no longer the module param 'irq_type',
> > but instead test->irq_type. test->irq_type is by default
> > IRQ_TYPE_UNDEFINED (until someone calls ioctl(PCITEST_SET_IRQTYPE)).
> > 
> > However, the commit also changed so that after initializing test->irq_type
> > to IRQ_TYPE_UNDEFINED, it also overrides it with driver_data->irq_type, if
> > the PCI device and vendor ID provides driver_data.
> > 
> > [...]
> 
> Applied, thanks!
> 
> [1/1] misc: pci_endpoint_test: Defer IRQ allocation until ioctl(PCITEST_SET_IRQTYPE)
>       commit: 9d564bf7ab67ec326ec047d2d95087d8d888f9b1

a402006d48a9c ("misc: pci_endpoint_test: Remove global 'irq_type' and
'no_msi'") appeared in v6.15-rc1, and apparently caused a regression
that some driver fails to probe on such platforms.

Since a402006d48a9c caused a regression and hasn't appeared in a
release yet, this sounds like a candidate for v6.15 via pci/for-linus?

I can move it if you agree.  I *would* like to have a little more
detail about the regression, e.g., the affected driver, so I can
justify merging this after the merge window.

Bjorn