misc: pci_endpoint_test: Enable/Disable MSI using module param

In certain platforms like TI's DRA7 SoCs, use of legacy PCI interrupt is
exclusive with use of MSI (Section 24.9.4.6.2.1 Legacy PCI Interrupts in
http://www.ti.com/lit/ug/spruhz6i/spruhz6i.pdf).

However pci_endpoint_test driver enables MSI by default in probe. In order
for pci_endpoint_test to be able to test legacy interrupt, MSI should be
disabled. Add a module param 'no_msi' to disable MSI (only when legacy
interrupt has to be tested).

Signed-off-by: Kishon Vijay Abraham I <[e-mail]>
[bhelgaas: folded in static fix from Colin Ian King <[e-mail]>]
Signed-off-by: Bjorn Helgaas <[e-mail]>

drivers/misc/pci_endpoint_test.c

···
 
 #define to_endpoint_test(priv) container_of((priv), struct pci_endpoint_test, \
 					    miscdev)
+
+static bool no_msi;
+module_param(no_msi, bool, 0444);
+MODULE_PARM_DESC(no_msi, "Disable MSI interrupt in pci_endpoint_test");
+
 enum pci_barno {
 	BAR_0,
 	BAR_1,
···
 	int err;
 	int irq = 0;
 	int id;
-	bool no_msi = false;
 	char name[20];
 	enum pci_barno bar;
 	void __iomem *base;