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PCI: Remove from bus_list and release resources in pci_release_dev() 

Previously we removed the pci_dev from the bus_list and released its
resources in pci_destroy_dev().  But that's too early: it's possible to
call pci_destroy_dev() twice for the same device (e.g., via sysfs), and
that will cause an oops when we try to remove it from bus_list the second
time.

We should remove it from the bus_list only when the last reference to the
pci_dev has been released, i.e., in pci_release_dev().

[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yinghai Lu 2013-11-30 14:40:29 -08:00 committed by Bjorn Helgaas
parent ef37702eb3
commit ef83b0781a
2 changed files with 19 additions and 21 deletions
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21
drivers/pci/probe.c
View File

@ -1154,6 +1154,18 @@ static void pci_release_capabilities(struct pci_dev *dev)
pci_free_cap_save_buffers(dev);
}
static void pci_free_resources(struct pci_dev *dev)
{
int i;
pci_cleanup_rom(dev);
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *res = dev->resource + i;
if (res->parent)
release_resource(res);
}
}
/**
* pci_release_dev - free a pci device structure when all users of it are finished.
* @dev: device that's been disconnected
@ -1163,9 +1175,14 @@ static void pci_release_capabilities(struct pci_dev *dev)
*/
static void pci_release_dev(struct device *dev)
{
struct pci_dev *pci_dev;
struct pci_dev *pci_dev = to_pci_dev(dev);
down_write(&pci_bus_sem);
list_del(&pci_dev->bus_list);
up_write(&pci_bus_sem);
pci_free_resources(pci_dev);
pci_dev = to_pci_dev(dev);
pci_release_capabilities(pci_dev);
pci_release_of_node(pci_dev);
pcibios_release_device(pci_dev);

19
drivers/pci/remove.c
View File

@ -3,20 +3,6 @@
#include <linux/pci-aspm.h>
#include "pci.h"
static void pci_free_resources(struct pci_dev *dev)
{
int i;
msi_remove_pci_irq_vectors(dev);
pci_cleanup_rom(dev);
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *res = dev->resource + i;
if (res->parent)
release_resource(res);
}
}
static void pci_stop_dev(struct pci_dev *dev)
{
pci_pme_active(dev, false);
@ -36,11 +22,6 @@ static void pci_destroy_dev(struct pci_dev *dev)
{
device_del(&dev->dev);
down_write(&pci_bus_sem);
list_del(&dev->bus_list);
up_write(&pci_bus_sem);
pci_free_resources(dev);
put_device(&dev->dev);
}