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authorKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>2008-04-25 14:39:02 -0700
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-04-25 14:39:02 -0700
commit2d32a9aed2e335d110fbb11985a9545b1f7219ab (patch)
tree46b6cb666c11a3f55b26cd7e73829b6fd130f649 /drivers/pci/hotplug
parentc6b069e94601aea8887afbbd922afe20a3580a7d (diff)
pciehp: Add missing memory barrier
Fix the possible race condition between pcie_isr() and pciehp_write_cmd() because of the lack of memory barrier. Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/hotplug')
-rw-r--r--drivers/pci/hotplug/pciehp_hpc.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 51a5055f696..19eba2a2f74 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -279,6 +279,7 @@ static int pcie_write_cmd(struct slot *slot, u16 cmd, u16 mask)
slot_ctrl |= ((cmd & mask) | CMD_CMPL_INTR_ENABLE);
ctrl->cmd_busy = 1;
+ smp_mb();
retval = pciehp_writew(ctrl, SLOTCTRL, slot_ctrl);
if (retval)
err("%s: Cannot write to SLOTCTRL register\n", __func__);
@@ -759,6 +760,7 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
/* Check Command Complete Interrupt Pending */
if (intr_loc & CMD_COMPLETED) {
ctrl->cmd_busy = 0;
+ smp_mb();
wake_up_interruptible(&ctrl->queue);
}