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 <kishon@ti.com>
[bhelgaas: folded in static fix from Colin Ian King <colin.king@canonical.com>]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 1f37ad3..deb2030 100644 (file)
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -72,6 +72,11 @@ static DEFINE_IDA(pci_endpoint_test_ida);
 
 #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,
@@ -451,7 +456,6 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
        int err;
        int irq = 0;
        int id;
-       bool no_msi = false;
        char name[20];
        enum pci_barno bar;
        void __iomem *base;