PCI: hotplug: pciehp: Fix possible race condition in writing slot

The slot control register is modified as follows:

    (1) Read the register value
    (2) Change the value
    (3) Write the value to the register

Those must be done atomically, otherwise writing to control register
would cause an unexpected result.

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>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index ccc57627201e..7959c222dc24 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -103,6 +103,7 @@ struct controller {
         u8 cap_base;
         struct timer_list poll_timer;
         volatile int cmd_busy;
+        spinlock_t lock;
 };
 
 #define INT_BUTTON_IGNORE               0