gpio/langwell: allocate IRQ descriptors dynamically for SPARSE_IRQ

Since x86 is using SPARSE_IRQ by default nowadays it means that we need to
allocate IRQ descriptors dynamically using irq_alloc_descs() otherwise the
genirq code fails to convert our irq numbers to suitable descriptors.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 13 insertions, 3 deletions

diff --git a/drivers/gpio/gpio-langwell.c b/drivers/gpio/gpio-langwell.c
index 0bea41b8a22..bc15ae3d7cf 100644
--- a/drivers/gpio/gpio-langwell.c
+++ b/drivers/gpio/gpio-langwell.c
@@ -306,6 +306,7 @@ static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
         u32 irq_base;
         u32 gpio_base;
         int retval = 0;
+        int ngpio = id->driver_data;
 
         retval = pci_enable_device(pdev);
         if (retval)
@@ -344,8 +345,15 @@ static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
                 retval = -ENOMEM;
                 goto err3;
         }
+
+        retval = irq_alloc_descs(-1, irq_base, ngpio, 0);
+        if (retval < 0) {
+                dev_err(&pdev->dev, "can't allocate IRQ descs\n");
+                goto err3;
+        }
+        lnw->irq_base = retval;
+
         lnw->reg_base = base;
-        lnw->irq_base = irq_base;
         lnw->chip.label = dev_name(&pdev->dev);
         lnw->chip.request = lnw_gpio_request;
         lnw->chip.direction_input = lnw_gpio_direction_input;
@@ -354,14 +362,14 @@ static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
         lnw->chip.set = lnw_gpio_set;
         lnw->chip.to_irq = lnw_gpio_to_irq;
         lnw->chip.base = gpio_base;
-        lnw->chip.ngpio = id->driver_data;
+        lnw->chip.ngpio = ngpio;
         lnw->chip.can_sleep = 0;
         lnw->pdev = pdev;
         pci_set_drvdata(pdev, lnw);
         retval = gpiochip_add(&lnw->chip);
         if (retval) {
                 dev_err(&pdev->dev, "langwell gpiochip_add error %d\n", retval);
-                goto err3;
+                goto err4;
         }
         irq_set_handler_data(pdev->irq, lnw);
         irq_set_chained_handler(pdev->irq, lnw_irq_handler);
@@ -378,6 +386,8 @@ static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
 
         return 0;
 
+err4:
+        irq_free_descs(lnw->irq_base, ngpio);
 err3:
         pci_release_regions(pdev);
 err2: