PCI: Add pcibios_alloc_irq() and pcibios_free_irq()

Add pcibios_alloc_irq() and pcibios_free_irq(), which are called when
binding/unbinding PCI device drivers.

PCI arch code may implement these to manage IRQ resources for hotplugged
devices.

[bhelgaas: changelog]
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 20 insertions, 6 deletions

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 3cb2210de553..52a880ca1768 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -388,18 +388,31 @@ static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
         return error;
 }
 
+int __weak pcibios_alloc_irq(struct pci_dev *dev)
+{
+        return 0;
+}
+
+void __weak pcibios_free_irq(struct pci_dev *dev)
+{
+}
+
 static int pci_device_probe(struct device *dev)
 {
-        int error = 0;
-        struct pci_driver *drv;
-        struct pci_dev *pci_dev;
+        int error;
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct pci_driver *drv = to_pci_driver(dev->driver);
+
+        error = pcibios_alloc_irq(pci_dev);
+        if (error < 0)
+                return error;
 
-        drv = to_pci_driver(dev->driver);
-        pci_dev = to_pci_dev(dev);
         pci_dev_get(pci_dev);
         error = __pci_device_probe(drv, pci_dev);
-        if (error)
+        if (error) {
+                pcibios_free_irq(pci_dev);
                 pci_dev_put(pci_dev);
+        }
 
         return error;
 }
@@ -415,6 +428,7 @@ static int pci_device_remove(struct device *dev)
                         drv->remove(pci_dev);
                         pm_runtime_put_noidle(dev);
                 }
+                pcibios_free_irq(pci_dev);
                 pci_dev->driver = NULL;
         }