linux-kernel - Re: [PATCH v3 3/5] misc: pci_endpoint_test: Fix irq

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Message-ID: <Z63zFBn6jDZG4s9d@ryzen>
Date: Thu, 13 Feb 2025 14:26:44 +0100
From: Niklas Cassel <cassel@...nel.org>
To: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Krzysztof Wilczynski <kw@...ux.com>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v3 3/5] misc: pci_endpoint_test: Fix irq_type to convey
 the correct type

On Thu, Feb 13, 2025 at 07:21:45PM +0900, Kunihiko Hayashi wrote:
> Hi Niklas,
> 
> On 2025/02/11 1:01, Niklas Cassel wrote:
> > On Mon, Feb 10, 2025 at 04:58:10PM +0900, Kunihiko Hayashi wrote:
> > > There are two variables that indicate the interrupt type to be used
> > > in the next test execution, "irq_type" as global and test->irq_type.
> > > 
> > > The global is referenced from pci_endpoint_test_get_irq() to preserve
> > > the current type for ioctl(PCITEST_GET_IRQTYPE).
> > > 
> > > The type set in this function isn't reflected in the global "irq_type",
> > > so ioctl(PCITEST_GET_IRQTYPE) returns the previous type.
> > > As a result, the wrong type will be displayed in "pcitest" as follows:
> > > 
> > >      # pcitest -i 0
> > >      SET IRQ TYPE TO LEGACY:         OKAY
> > >      # pcitest -I
> > >      GET IRQ TYPE:           MSI
> > > 
> > > Fix this issue by propagating the current type to the global "irq_type".
> > > 
> > > Cc: stable@...r.kernel.org
> > > Fixes: b2ba9225e031 ("misc: pci_endpoint_test: Avoid using module
> > parameter to determine irqtype")
> > > Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> > > ---
> > >   drivers/misc/pci_endpoint_test.c | 1 +
> > >   1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/drivers/misc/pci_endpoint_test.c
> > b/drivers/misc/pci_endpoint_test.c
> > > index f13fa32ef91a..6a0972e7674f 100644
> > > --- a/drivers/misc/pci_endpoint_test.c
> > > +++ b/drivers/misc/pci_endpoint_test.c
> > > @@ -829,6 +829,7 @@ static int pci_endpoint_test_set_irq(struct
> > pci_endpoint_test *test,
> > >   		return ret;
> > >   	}
> > > +	irq_type = test->irq_type;
> > 
> > It feels a bit silly to add this line, when you remove this exact line in
> > the next patch. Perhaps just drop this patch?
> 
> This fix will be removed in patch 4/5, so it seems no means.
> However, there is an issue in the stable version, as mentioned in the
> commit message, so I fix it here.

Ok. Having a small fix first that can be backported, which is then followed
by a bigger cleanup, makes sense in this case.

Reviewed-by: Niklas Cassel <cassel@...nel.org>