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| author | Yinghai Lu <yinghai@kernel.org> | 2013-01-21 13:20:51 -0800 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2013-01-25 15:10:12 -0700 |
| commit | 58d9a38f6facb28e935ec2747f6d9e9bf4684118 (patch) | |
| tree | 252899cd333ccc3c23c2435acd3f377512092aa0 /drivers/pci | |
| parent | d59f53bc9bd80ee62072dea590fc623c67cb84a8 (diff) | |
| download | lwn-58d9a38f6facb28e935ec2747f6d9e9bf4684118.tar.gz lwn-58d9a38f6facb28e935ec2747f6d9e9bf4684118.zip | |
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')
| -rw-r--r-- | drivers/pci/bus.c | 5 | ||||
| -rw-r--r-- | drivers/pci/pci-driver.c | 6 |
2 files changed, 10 insertions, 1 deletions
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 847f3ca47bb8..c8709c6fdb7c 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); diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index f79cbcd3944b..acdcc3c6ecdd 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -1186,9 +1186,13 @@ pci_dev_driver(const struct pci_dev *dev) static int pci_bus_match(struct device *dev, struct device_driver *drv) { struct pci_dev *pci_dev = to_pci_dev(dev); - struct pci_driver *pci_drv = to_pci_driver(drv); + struct pci_driver *pci_drv; const struct pci_device_id *found_id; + if (!pci_dev->match_driver) + return 0; + + pci_drv = to_pci_driver(drv); found_id = pci_match_device(pci_drv, pci_dev); if (found_id) return 1; |