habanalabs: use NULL for eventfd

eventfd is pointer. As such, it should be initialized to NULL, not to 0.

In addition, no need to initialize it after creation because the
entire structure is zeroed-out. Also, no need to initialize it before
release because the entire structure is freed.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/habanalabs/common/device.c

@@ -286,10 +286,8 @@ static void hpriv_release(struct kref *ref)
 	hdev->compute_ctx_in_release = 0;
 
 	/* release the eventfd */
-	if (hpriv->notifier_event.eventfd) {
+	if (hpriv->notifier_event.eventfd)
 		eventfd_ctx_put(hpriv->notifier_event.eventfd);
-		hpriv->notifier_event.eventfd = 0;
-	}
 
 	mutex_destroy(&hpriv->notifier_event.lock);
 
@@ -364,10 +362,8 @@ static int hl_device_release_ctrl(struct inode *inode, struct file *filp)
 	mutex_unlock(&hdev->fpriv_ctrl_list_lock);
 out:
 	/* release the eventfd */
-	if (hpriv->notifier_event.eventfd) {
+	if (hpriv->notifier_event.eventfd)
 		eventfd_ctx_put(hpriv->notifier_event.eventfd);
-		hpriv->notifier_event.eventfd = 0;
-	}
 
 	mutex_destroy(&hpriv->notifier_event.lock);
 	put_pid(hpriv->taskpid);

drivers/misc/habanalabs/common/habanalabs_drv.c

@@ -134,8 +134,6 @@ int hl_device_open(struct inode *inode, struct file *filp)
 	hpriv->hdev = hdev;
 	filp->private_data = hpriv;
 	hpriv->filp = filp;
-	hpriv->notifier_event.events_mask = 0;
-	hpriv->notifier_event.eventfd = 0;
 
 	mutex_init(&hpriv->notifier_event.lock);
 	mutex_init(&hpriv->restore_phase_mutex);
@@ -246,8 +244,6 @@ int hl_device_open_ctrl(struct inode *inode, struct file *filp)
 	hpriv->hdev = hdev;
 	filp->private_data = hpriv;
 	hpriv->filp = filp;
-	hpriv->notifier_event.events_mask = 0;
-	hpriv->notifier_event.eventfd = 0;
 
 	mutex_init(&hpriv->notifier_event.lock);
 	nonseekable_open(inode, filp);

drivers/misc/habanalabs/common/habanalabs_ioctl.c

@@ -647,7 +647,7 @@ static int eventfd_register(struct hl_fpriv *hpriv, struct hl_info_args *args)
 	hpriv->notifier_event.eventfd = eventfd_ctx_fdget(args->eventfd);
 	if (IS_ERR(hpriv->notifier_event.eventfd)) {
 		rc = PTR_ERR(hpriv->notifier_event.eventfd);
-		hpriv->notifier_event.eventfd = 0;
+		hpriv->notifier_event.eventfd = NULL;
 		mutex_unlock(&hpriv->notifier_event.lock);
 		return rc;
 	}
@@ -665,7 +665,7 @@ static int eventfd_unregister(struct hl_fpriv *hpriv, struct hl_info_args *args)
 	}
 
 	eventfd_ctx_put(hpriv->notifier_event.eventfd);
-	hpriv->notifier_event.eventfd = 0;
+	hpriv->notifier_event.eventfd = NULL;
 	mutex_unlock(&hpriv->notifier_event.lock);
 	return 0;
 }