Merge branch 'pci/hotplug'

- Add quirk to work around Qualcomm hardware defect in Command Completed
  signaling (Manivannan Sadhasivam)

- Remove locking to allow devices to be marked as disconnected immediately
  instead of waiting for concurrent bind/unbind to complete (Lukas Wunner)

* pci/hotplug:
  PCI: hotplug: Allow marking devices as disconnected during bind/unbind
  PCI: pciehp: Add Qualcomm quirk for Command Completed erratum

2 files changed, 15 insertions, 30 deletions

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 10e9670eea0b..f8c70115b691 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -1088,6 +1088,8 @@ static void quirk_cmd_compl(struct pci_dev *pdev)
 }
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
 			      PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl);
+DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_QCOM, 0x010e,
+			      PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl);
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_QCOM, 0x0110,
 			      PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl);
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_QCOM, 0x0400,
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 9ed3b5550043..5d5a44aaafe8 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -310,53 +310,36 @@ struct pci_sriov {
  * @dev: PCI device to set new error_state
  * @new: the state we want dev to be in
  *
- * Must be called with device_lock held.
+ * If the device is experiencing perm_failure, it has to remain in that state.
+ * Any other transition is allowed.
  *
  * Returns true if state has been changed to the requested state.
  */
 static inline bool pci_dev_set_io_state(struct pci_dev *dev,
 					pci_channel_state_t new)
 {
-	bool changed = false;
+	pci_channel_state_t old;
 
-	device_lock_assert(&dev->dev);
 	switch (new) {
 	case pci_channel_io_perm_failure:
-		switch (dev->error_state) {
-		case pci_channel_io_frozen:
-		case pci_channel_io_normal:
-		case pci_channel_io_perm_failure:
-			changed = true;
-			break;
-		}
-		break;
+		xchg(&dev->error_state, pci_channel_io_perm_failure);
+		return true;
 	case pci_channel_io_frozen:
-		switch (dev->error_state) {
-		case pci_channel_io_frozen:
-		case pci_channel_io_normal:
-			changed = true;
-			break;
-		}
-		break;
+		old = cmpxchg(&dev->error_state, pci_channel_io_normal,
+			      pci_channel_io_frozen);
+		return old != pci_channel_io_perm_failure;
 	case pci_channel_io_normal:
-		switch (dev->error_state) {
-		case pci_channel_io_frozen:
-		case pci_channel_io_normal:
-			changed = true;
-			break;
-		}
-		break;
+		old = cmpxchg(&dev->error_state, pci_channel_io_frozen,
+			      pci_channel_io_normal);
+		return old != pci_channel_io_perm_failure;
+	default:
+		return false;
 	}
-	if (changed)
-		dev->error_state = new;
-	return changed;
 }
 
 static inline int pci_dev_set_disconnected(struct pci_dev *dev, void *unused)
 {
-	device_lock(&dev->dev);
 	pci_dev_set_io_state(dev, pci_channel_io_perm_failure);
-	device_unlock(&dev->dev);
 
 	return 0;
 }