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-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);
}