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>

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 3cb2210de5530e3edffd3286df3a66f455f6b2ec..52a880ca1768362ec41399e8df11c3504a28a107 100644 (file)
--- 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;
        }
 

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8a0321a8fb595892c5e80910d5c914c89ded63de..b4832c92f23e67d8109902104d13270dccf3a1d6 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1645,6 +1645,8 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev,
 int pcibios_add_device(struct pci_dev *dev);
 void pcibios_release_device(struct pci_dev *dev);
 void pcibios_penalize_isa_irq(int irq, int active);
+int pcibios_alloc_irq(struct pci_dev *dev);
+void pcibios_free_irq(struct pci_dev *dev);
 
 #ifdef CONFIG_HIBERNATE_CALLBACKS
 extern struct dev_pm_ops pcibios_pm_ops;