2 files changed, 25 insertions, 4 deletions

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 69fab0fd15ae..e9851add6f4e 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -907,8 +907,14 @@ static void vfio_pci_request(void *device_data, unsigned int count)
         mutex_lock(&vdev->igate);
 
         if (vdev->req_trigger) {
-                dev_dbg(&vdev->pdev->dev, "Requesting device from user\n");
+                if (!(count % 10))
+                        dev_notice_ratelimited(&vdev->pdev->dev,
+                                "Relaying device request to user (#%u)\n",
+                                count);
                 eventfd_signal(vdev->req_trigger, 1);
+        } else if (count == 0) {
+                dev_warn(&vdev->pdev->dev,
+                        "No device request channel registered, blocked until released by user\n");
         }
 
         mutex_unlock(&vdev->igate);
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 0d336625ac71..e1278fe04b1e 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -710,6 +710,8 @@ void *vfio_del_group_dev(struct device *dev)
         void *device_data = device->device_data;
         struct vfio_unbound_dev *unbound;
         unsigned int i = 0;
+        long ret;
+        bool interrupted = false;
 
         /*
          * The group exists so long as we have a device reference.  Get
@@ -755,9 +757,22 @@ void *vfio_del_group_dev(struct device *dev)
 
                 vfio_device_put(device);
 
-        } while (wait_event_interruptible_timeout(vfio.release_q,
-                                                  !vfio_dev_present(group, dev),
-                                                  HZ * 10) <= 0);
+                if (interrupted) {
+                        ret = wait_event_timeout(vfio.release_q,
+                                        !vfio_dev_present(group, dev), HZ * 10);
+                } else {
+                        ret = wait_event_interruptible_timeout(vfio.release_q,
+                                        !vfio_dev_present(group, dev), HZ * 10);
+                        if (ret == -ERESTARTSYS) {
+                                interrupted = true;
+                                dev_warn(dev,
+                                         "Device is currently in use, task"
+                                         " \"%s\" (%d) "
+                                         "blocked until device is released",
+                                         current->comm, task_pid_nr(current));
+                        }
+                }
+        } while (ret <= 0);
 
         vfio_group_put(group);