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Wed, 17 Aug 2022 16:11:43 +0000 Received: from MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::462:7fe:f04f:d0d5]) by MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::462:7fe:f04f:d0d5%6]) with mapi id 15.20.5525.019; Wed, 17 Aug 2022 16:11:43 +0000 From: Jason Gunthorpe To: Alex Williamson , =?utf-8?q?Christian_K?= =?utf-8?q?=C3=B6nig?= , Cornelia Huck , dri-devel@lists.freedesktop.org, kvm@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org, Sumit Semwal Subject: [PATCH 2/4] vfio: Add vfio_device_get() Date: Wed, 17 Aug 2022 13:11:40 -0300 Message-Id: <2-v1-9e6e1739ed95+5fa-vfio_dma_buf_jgg@nvidia.com> In-Reply-To: <0-v1-9e6e1739ed95+5fa-vfio_dma_buf_jgg@nvidia.com> References: X-ClientProxiedBy: MN2PR05CA0036.namprd05.prod.outlook.com (2603:10b6:208:c0::49) To MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5e25a312-2e10-4ae5-a0d3-08da806b2d3a X-MS-TrafficTypeDiagnostic: CO6PR12MB5458:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Export vfio_device_put() to pair with it. Signed-off-by: Jason Gunthorpe --- drivers/vfio/vfio_main.c | 3 ++- include/linux/vfio.h | 6 ++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 6f96e6d07a5e98..5ad50aec7dc94c 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -451,11 +451,12 @@ static void vfio_group_get(struct vfio_group *group) * Device objects - create, release, get, put, search */ /* Device reference always implies a group reference */ -static void vfio_device_put(struct vfio_device *device) +void vfio_device_put(struct vfio_device *device) { if (refcount_dec_and_test(&device->refcount)) complete(&device->comp); } +EXPORT_SYMBOL_GPL(vfio_device_put); static bool vfio_device_try_get(struct vfio_device *device) { diff --git a/include/linux/vfio.h b/include/linux/vfio.h index e05ddc6fe6a556..25850b1e08cba9 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -143,6 +143,12 @@ void vfio_uninit_group_dev(struct vfio_device *device); int vfio_register_group_dev(struct vfio_device *device); int vfio_register_emulated_iommu_dev(struct vfio_device *device); void vfio_unregister_group_dev(struct vfio_device *device); +void vfio_device_put(struct vfio_device *device); + +static inline void vfio_device_get(struct vfio_device *device) +{ + refcount_inc(&device->refcount); +} int vfio_assign_device_set(struct vfio_device *device, void *set_id);