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authorKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>2006-09-22 10:17:29 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2006-10-18 11:36:10 -0700
commitdd5619cb4407e830a8921a93c949be37c81105b5 (patch)
treef726db26b6019e6f741dfb146e3d37eca9198cf4 /drivers/pci/hotplug/pciehp.h
parent49ed2b4963cd00993eab518b820a6700f94f222d (diff)
downloadblackbird-op-linux-dd5619cb4407e830a8921a93c949be37c81105b5.tar.gz
blackbird-op-linux-dd5619cb4407e830a8921a93c949be37c81105b5.zip
pciehp - add missing locking
This patch fixes the problem that system will panic if multiple power on/off operations are issued to the same slot in parallel. This problem can be easily reproduced by commands below. # while true; do echo 1 > power; echo 0 > power; done & # while true; do echo 1 > power; echo 0 > power; done & The cause is lack of locking for enable/disable operations. This patch fixes this problem. Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci/hotplug/pciehp.h')
-rw-r--r--drivers/pci/hotplug/pciehp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index b71f774aca16..30f021c55fe5 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -92,6 +92,7 @@ struct php_ctlr_state_s {
struct controller {
struct controller *next;
struct mutex crit_sect; /* critical section mutex */
+ struct mutex ctrl_lock; /* controller lock */
struct php_ctlr_state_s *hpc_ctlr_handle; /* HPC controller handle */
int num_slots; /* Number of slots on ctlr */
int slot_num_inc; /* 1 or -1 */
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