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PCI: Fix pci cardbus removal 

During test busn_res allocation with cardbus, found pci card removal is not
working anymore, and it turns out it is broken by:

|commit 79cc9601c3
|Date:   Tue Nov 22 21:06:53 2011 -0800
|
|    PCI: Only call pci_stop_bus_device() one time for child devices at remove

The above changed the behavior of pci_remove_behind_bridge that
yenta_cardbus depended on.  So restore the old behavoir of
pci_remove_behind_bridge (which requires stopping and removing of all
devices) by:

1. rename pci_remove_behind_bridge to __pci_remove_behind_bridge, and let
   __pci_remove_bus_device() call it instead.
2. add pci_stop_behind_bridge that will stop devices behind a bridge
3. add back pci_remove_behind_bridge that will stop and remove devices
   under bridge.

-v2: update commit description a little bit.

Tested-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yinghai Lu 2012-02-04 22:55:00 -08:00 committed by Jesse Barnes
parent 8161fe91d8
commit 3682a3946d
1 changed files with 22 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/pci/remove.c
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@ -77,6 +77,7 @@ void pci_remove_bus(struct pci_bus *pci_bus)
}
EXPORT_SYMBOL(pci_remove_bus);
static void __pci_remove_behind_bridge(struct pci_dev *dev);
/**
* pci_remove_bus_device - remove a PCI device and any children
* @dev: the device to remove
@ -94,7 +95,7 @@ static void __pci_remove_bus_device(struct pci_dev *dev)
if (dev->subordinate) {
struct pci_bus *b = dev->subordinate;
pci_remove_behind_bridge(dev);
__pci_remove_behind_bridge(dev);
pci_remove_bus(b);
dev->subordinate = NULL;
}
@ -107,6 +108,24 @@ void pci_remove_bus_device(struct pci_dev *dev)
__pci_remove_bus_device(dev);
}
static void __pci_remove_behind_bridge(struct pci_dev *dev)
{
struct list_head *l, *n;
if (dev->subordinate)
list_for_each_safe(l, n, &dev->subordinate->devices)
__pci_remove_bus_device(pci_dev_b(l));
}
static void pci_stop_behind_bridge(struct pci_dev *dev)
{
struct list_head *l, *n;
if (dev->subordinate)
list_for_each_safe(l, n, &dev->subordinate->devices)
pci_stop_bus_device(pci_dev_b(l));
}
/**
* pci_remove_behind_bridge - remove all devices behind a PCI bridge
* @dev: PCI bridge device
@ -117,11 +136,8 @@ void pci_remove_bus_device(struct pci_dev *dev)
*/
void pci_remove_behind_bridge(struct pci_dev *dev)
{
struct list_head *l, *n;
if (dev->subordinate)
list_for_each_safe(l, n, &dev->subordinate->devices)
__pci_remove_bus_device(pci_dev_b(l));
pci_stop_behind_bridge(dev);
__pci_remove_behind_bridge(dev);
}
static void pci_stop_bus_devices(struct pci_bus *bus)