nvme-pci: don't unbind the driver on reset failure

Unbind a device driver when a reset fails is very unusual behavior.
Just shut the controller down and leave it in dead state if we fail
to reset it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>

drivers/nvme/host/pci.c

@@ -130,7 +130,6 @@ struct nvme_dev {
 	u32 db_stride;
 	void __iomem *bar;
 	unsigned long bar_mapped_size;
-	struct work_struct remove_work;
 	struct mutex shutdown_lock;
 	bool subsystem;
 	u64 cmb_size;
@@ -2797,20 +2796,6 @@ static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl)
 	kfree(dev);
 }
 
-static void nvme_remove_dead_ctrl(struct nvme_dev *dev)
-{
-	/*
-	 * Set state to deleting now to avoid blocking nvme_wait_reset(), which
-	 * may be holding this pci_dev's device lock.
-	 */
-	nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING);
-	nvme_get_ctrl(&dev->ctrl);
-	nvme_dev_disable(dev, false);
-	nvme_mark_namespaces_dead(&dev->ctrl);
-	if (!queue_work(nvme_wq, &dev->remove_work))
-		nvme_put_ctrl(&dev->ctrl);
-}
-
 static void nvme_reset_work(struct work_struct *work)
 {
 	struct nvme_dev *dev =
@@ -2901,20 +2886,16 @@ static void nvme_reset_work(struct work_struct *work)
  out_unlock:
 	mutex_unlock(&dev->shutdown_lock);
  out:
-	if (result)
-		dev_warn(dev->ctrl.device,
-			 "Removing after probe failure status: %d\n", result);
-	nvme_remove_dead_ctrl(dev);
-}
-
-static void nvme_remove_dead_ctrl_work(struct work_struct *work)
-{
-	struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work);
-	struct pci_dev *pdev = to_pci_dev(dev->dev);
-
-	if (pci_get_drvdata(pdev))
-		device_release_driver(&pdev->dev);
-	nvme_put_ctrl(&dev->ctrl);
+	/*
+	 * Set state to deleting now to avoid blocking nvme_wait_reset(), which
+	 * may be holding this pci_dev's device lock.
+	 */
+	dev_warn(dev->ctrl.device, "Disabling device after reset failure: %d\n",
+		 result);
+	nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING);
+	nvme_dev_disable(dev, true);
+	nvme_mark_namespaces_dead(&dev->ctrl);
+	nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DEAD);
 }
 
 static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val)
@@ -3052,7 +3033,6 @@ static struct nvme_dev *nvme_pci_alloc_dev(struct pci_dev *pdev,
 	if (!dev)
 		return NULL;
 	INIT_WORK(&dev->ctrl.reset_work, nvme_reset_work);
-	INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work);
 	mutex_init(&dev->shutdown_lock);
 
 	dev->nr_write_queues = write_queues;