1 files changed, 30 insertions, 27 deletions

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 192e7b681b96..df4aead394f2 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -96,7 +96,7 @@ static void pci_free_dynids(struct pci_driver *drv)
  *
  * Allow PCI IDs to be added to an existing driver via sysfs.
  */
-static ssize_t store_new_id(struct device_driver *driver, const char *buf,
+static ssize_t new_id_store(struct device_driver *driver, const char *buf,
 			    size_t count)
 {
 	struct pci_driver *pdrv = to_pci_driver(driver);
@@ -154,7 +154,7 @@ static ssize_t store_new_id(struct device_driver *driver, const char *buf,
 		return retval;
 	return count;
 }
-static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
+static DRIVER_ATTR_WO(new_id);
 
 /**
  * store_remove_id - remove a PCI device ID from this driver
@@ -164,7 +164,7 @@ static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
  *
  * Removes a dynamic pci device ID to this driver.
  */
-static ssize_t store_remove_id(struct device_driver *driver, const char *buf,
+static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
 			       size_t count)
 {
 	struct pci_dynid *dynid, *n;
@@ -198,7 +198,7 @@ static ssize_t store_remove_id(struct device_driver *driver, const char *buf,
 
 	return retval;
 }
-static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
+static DRIVER_ATTR_WO(remove_id);
 
 static struct attribute *pci_drv_attrs[] = {
 	&driver_attr_new_id.attr,
@@ -320,10 +320,19 @@ static long local_pci_probe(void *_ddi)
 	return 0;
 }
 
+static bool pci_physfn_is_probed(struct pci_dev *dev)
+{
+#ifdef CONFIG_PCI_IOV
+	return dev->is_virtfn && dev->physfn->is_probed;
+#else
+	return false;
+#endif
+}
+
 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
 			  const struct pci_device_id *id)
 {
-	int error, node;
+	int error, node, cpu;
 	struct drv_dev_and_id ddi = { drv, dev, id };
 
 	/*
@@ -332,33 +341,27 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
 	 * on the right node.
 	 */
 	node = dev_to_node(&dev->dev);
+	dev->is_probed = 1;
+
+	cpu_hotplug_disable();
 
 	/*
-	 * On NUMA systems, we are likely to call a PF probe function using
-	 * work_on_cpu().  If that probe calls pci_enable_sriov() (which
-	 * adds the VF devices via pci_bus_add_device()), we may re-enter
-	 * this function to call the VF probe function.  Calling
-	 * work_on_cpu() again will cause a lockdep warning.  Since VFs are
-	 * always on the same node as the PF, we can work around this by
-	 * avoiding work_on_cpu() when we're already on the correct node.
-	 *
-	 * Preemption is enabled, so it's theoretically unsafe to use
-	 * numa_node_id(), but even if we run the probe function on the
-	 * wrong node, it should be functionally correct.
+	 * Prevent nesting work_on_cpu() for the case where a Virtual Function
+	 * device is probed from work_on_cpu() of the Physical device.
 	 */
-	if (node >= 0 && node != numa_node_id()) {
-		int cpu;
-
-		get_online_cpus();
+	if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
+	    pci_physfn_is_probed(dev))
+		cpu = nr_cpu_ids;
+	else
 		cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
-		if (cpu < nr_cpu_ids)
-			error = work_on_cpu(cpu, local_pci_probe, &ddi);
-		else
-			error = local_pci_probe(&ddi);
-		put_online_cpus();
-	} else
+
+	if (cpu < nr_cpu_ids)
+		error = work_on_cpu(cpu, local_pci_probe, &ddi);
+	else
 		error = local_pci_probe(&ddi);
 
+	dev->is_probed = 0;
+	cpu_hotplug_enable();
 	return error;
 }
 
@@ -1216,7 +1219,7 @@ static int pci_pm_runtime_resume(struct device *dev)
 
 	pci_restore_standard_config(pci_dev);
 	pci_fixup_device(pci_fixup_resume_early, pci_dev);
-	__pci_enable_wake(pci_dev, PCI_D0, true, false);
+	pci_enable_wake(pci_dev, PCI_D0, false);
 	pci_fixup_device(pci_fixup_resume, pci_dev);
 
 	rc = pm->runtime_resume(dev);