[PATCH v4 4/6] misc: pci_endpoint_test: Fix irq_type to convey the correct type

[Kunihiko Hayashi]

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 is displayed in old "pcitest" as follows:

    # pcitest -i 0
    SET IRQ TYPE TO LEGACY:         OKAY
    # pcitest -I
    GET IRQ TYPE:           MSI

And new "pcitest" in kselftest results in an error as follows:

    #  RUN           pci_ep_basic.LEGACY_IRQ_TEST ...
    # pci_endpoint_test.c:104:LEGACY_IRQ_TEST:Expected 0 (0) == ret (1)
    # pci_endpoint_test.c:104:LEGACY_IRQ_TEST:Can't get Legacy IRQ type

Fix this issue by propagating the current type to the global "irq_type".

Cc: stable@xxxxxxxxxxxxxxx
Fixes: b2ba9225e031 ("misc: pci_endpoint_test: Avoid using module parameter to determine irqtype")
Reviewed-by: Niklas Cassel <cassel@xxxxxxxxxx>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
---
 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 acf3d8dab131..896392c428de 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -833,6 +833,7 @@ static int pci_endpoint_test_set_irq(struct pci_endpoint_test *test,
 		return ret;
 	}
 
+	irq_type = test->irq_type;
 	return 0;
 }
 
-- 
2.25.1