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authorYinghai Lu <yinghai@kernel.org>2013-01-21 13:20:51 -0800
committerBjorn Helgaas <bhelgaas@google.com>2013-01-25 15:10:12 -0700
commit58d9a38f6facb28e935ec2747f6d9e9bf4684118 (patch)
tree252899cd333ccc3c23c2435acd3f377512092aa0 /drivers/pci/bus.c
parentd59f53bc9bd80ee62072dea590fc623c67cb84a8 (diff)
downloadop-kernel-dev-58d9a38f6facb28e935ec2747f6d9e9bf4684118.zip
op-kernel-dev-58d9a38f6facb28e935ec2747f6d9e9bf4684118.tar.gz
PCI: Skip attaching driver in device_add()
We want to add PCI devices to the device tree as early as possible but delay attaching drivers. device_add() adds a device to the device hierarchy and (via device_attach()) attaches a matching driver and calls its .probe() method. We want to separate adding the device to the hierarchy from attaching the driver. This patch does that by adding "match_driver" in struct pci_dev. When false, we return failure from pci_bus_match(), which makes device_attach() believe there's no matching driver. Later, we set "match_driver = true" and call device_attach() again, which now attaches the driver and calls its .probe() method. [bhelgaas: changelog, explicitly init dev->match_driver, fold device_attach() call into pci_bus_add_device()] Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/pci/bus.c')
-rw-r--r--drivers/pci/bus.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 847f3ca..c8709c6 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -177,10 +177,15 @@ int pci_bus_add_device(struct pci_dev *dev)
if (retval)
return retval;
+ dev->match_driver = false;
retval = device_add(&dev->dev);
if (retval)
return retval;
+ dev->match_driver = true;
+ retval = device_attach(&dev->dev);
+ WARN_ON(retval < 0);
+
dev->is_added = 1;
pci_proc_attach_device(dev);
pci_create_sysfs_dev_files(dev);
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