nvme-pci: add missing unlock for reset error

The reset work holds a mutex to prevent races with removal modifying the
same resources, but was unlocking only on success. Unlock on failure
too.

Fixes: 5c959d7 ("nvme-pci: fix rapid add remove sequence")
Signed-off-by: Keith Busch <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
(cherry picked from commit 4726bcf)
Orabug: 29933720

Signed-off-by: Alan Adamson <[email protected]>
Reviewed-by: John Donnelly <[email protected]>

Author: Keith Busch

drivers/nvme/host/pci.c

@@ -2271,15 +2271,15 @@ static void nvme_reset_work(struct work_struct *work)
 	mutex_lock(&dev->shutdown_lock);
 	result = nvme_pci_enable(dev);
 	if (result)
-		goto out;
+		goto out_unlock;
 
 	result = nvme_pci_configure_admin_queue(dev);
 	if (result)
-		goto out;
+		goto out_unlock;
 
 	result = nvme_alloc_admin_tags(dev);
 	if (result)
-		goto out;
+		goto out_unlock;
 
 	/*
 	 * Limit the max command size to prevent iod->sg allocations going
@@ -2362,6 +2362,8 @@ static void nvme_reset_work(struct work_struct *work)
 	nvme_start_ctrl(&dev->ctrl);
 	return;
 
+ out_unlock:
+	mutex_unlock(&dev->shutdown_lock);
  out:
 	nvme_remove_dead_ctrl(dev, result);
 }