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authorYinghai Lu <yinghai@kernel.org>2013-11-30 23:40:29 +0100
committerBjorn Helgaas <bhelgaas@google.com>2013-12-18 21:53:40 +0100
commitef83b0781a73f9efcb1228256bfdfb97fc9533a8 (patch)
tree01c8a9940789bfcef622006d9d8eb26fd4ab0ce6 /drivers/pci/probe.c
parentPCI: Move pci_proc_attach_device() to pci_bus_add_device() (diff)
downloadlinux-ef83b0781a73f9efcb1228256bfdfb97fc9533a8.tar.xz
linux-ef83b0781a73f9efcb1228256bfdfb97fc9533a8.zip
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>
Diffstat (limited to 'drivers/pci/probe.c')
-rw-r--r--drivers/pci/probe.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 173a9cf4593e..12ec56c9a913 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -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);