lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] PCI: fix race with pci_walk_bus and pci_destroy_dev

Browse Source 
pci_walk_bus has a race with pci_destroy_dev. When cb is called
in pci_walk_bus, pci_destroy_dev might unlink the dev pointed by next.
Later on in the next loop, pointer next becomes NULL and cause
kernel panic.

Below patch against 2.6.17-rc4 fixes it by changing pci_bus_lock (spin_lock)
to pci_bus_sem (rw_semaphore).

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Zhang Yanmin
2006-06-02 12:35:43 +08:00
committed by Greg Kroah-Hartman
parent 733a7fe122
commit d71374dafb
5 changed files with 41 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/pci/pci.h
View File

@@ -40,7 +40,7 @@ extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int
extern void pci_remove_legacy_files(struct pci_bus *bus);
/* Lock for read/write access to pci device and bus lists */
extern spinlock_t pci_bus_lock;
extern struct rw_semaphore pci_bus_sem;
#ifdef CONFIG_X86_IO_APIC
extern int pci_msi_quirk;