diff --git a/sys/compat/linuxkpi/common/include/linux/pci.h b/sys/compat/linuxkpi/common/include/linux/pci.h
--- a/sys/compat/linuxkpi/common/include/linux/pci.h
+++ b/sys/compat/linuxkpi/common/include/linux/pci.h
@@ -342,6 +342,7 @@
 	size_t			romlen;
 	struct msi_desc		**msi_desc;
 	char			*path_name;
+	spinlock_t		pcie_cap_lock;
 
 	TAILQ_HEAD(, pci_mmio_region)	mmio;
 };
@@ -1013,35 +1014,38 @@
 }
 
 static inline int
-pcie_capability_set_word(struct pci_dev *dev, int pos, uint16_t val)
+pcie_capability_clear_and_set_word(struct pci_dev *dev, int pos,
+    uint16_t clear, uint16_t set)
 {
 	int error;
 	uint16_t v;
 
+	if (pos == PCI_EXP_LNKCTL || pos == PCI_EXP_RTCTL)
+		spin_lock(&dev->pcie_cap_lock);
+
 	error = pcie_capability_read_word(dev, pos, &v);
-	if (error != 0)
-		return (error);
+	if (error == 0) {
+		v &= ~clear;
+		v |= set;
+		error = pcie_capability_write_word(dev, pos, v);
+	}
 
-	v |= val;
+	if (pos == PCI_EXP_LNKCTL || pos == PCI_EXP_RTCTL)
+		spin_unlock(&dev->pcie_cap_lock);
 
-	error = pcie_capability_write_word(dev, pos, v);
 	return (error);
 }
 
 static inline int
-pcie_capability_clear_word(struct pci_dev *dev, int pos, uint16_t val)
+pcie_capability_set_word(struct pci_dev *dev, int pos, uint16_t val)
 {
-	int error;
-	uint16_t v;
-
-	error = pcie_capability_read_word(dev, pos, &v);
-	if (error != 0)
-		return (error);
-
-	v &= ~val;
+	return (pcie_capability_clear_and_set_word(dev, pos, 0, val));
+}
 
-	error = pcie_capability_write_word(dev, pos, v);
-	return (error);
+static inline int
+pcie_capability_clear_word(struct pci_dev *dev, int pos, uint16_t val)
+{
+	return (pcie_capability_clear_and_set_word(dev, pos, val, 0));
 }
 
 static inline int pcie_get_minimum_link(struct pci_dev *dev,
diff --git a/sys/compat/linuxkpi/common/src/linux_pci.c b/sys/compat/linuxkpi/common/src/linux_pci.c
--- a/sys/compat/linuxkpi/common/src/linux_pci.c
+++ b/sys/compat/linuxkpi/common/src/linux_pci.c
@@ -524,6 +524,7 @@
 		goto out_dma_init;
 
 	TAILQ_INIT(&pdev->mmio);
+	spin_lock_init(&pdev->pcie_cap_lock);
 
 	spin_lock(&pci_lock);
 	list_add(&pdev->links, &pci_devices);