Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Leon Romanovsky <leon@kernel.org>
To:     Doug Ledford <dledford@redhat.com>,
        Jason Gunthorpe <jgg@nvidia.com>
Cc:     Yishai Hadas <yishaih@nvidia.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Kirti Wankhede <kwankhede@nvidia.com>, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
        linux-rdma@vger.kernel.org, netdev@vger.kernel.org,
        Saeed Mahameed <saeedm@nvidia.com>
Subject: [PATCH mlx5-next 3/7] vfio/pci_core: Make the region->release() function optional
Date:   Wed, 22 Sep 2021 13:38:52 +0300
Message-Id: <a01c7bb01ac4b1930a428fa8a8cae89bb1c4327a.1632305919.git.leonro@nvidia.com>
In-Reply-To: <cover.1632305919.git.leonro@nvidia.com>
References: <cover.1632305919.git.leonro@nvidia.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Yishai Hadas <yishaih@nvidia.com>

Make the region->release() function optional as in some cases there is
nothing to do by driver as part of it.

This is needed for coming patch from this series once we add
mlx5_vfio_cpi driver to support live migration but we don't need a
migration release function.

Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 drivers/vfio/pci/vfio_pci_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index 68198e0f2a63..3ddc3adb24de 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -341,7 +341,8 @@ void vfio_pci_core_disable(struct vfio_pci_core_device *vdev)
 	vdev->virq_disabled = false;
 
 	for (i = 0; i < vdev->num_regions; i++)
-		vdev->region[i].ops->release(vdev, &vdev->region[i]);
+		if (vdev->region[i].ops->release)
+			vdev->region[i].ops->release(vdev, &vdev->region[i]);
 
 	vdev->num_regions = 0;
 	kfree(vdev->region);
-- 
2.31.1