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[34.81.223.0]) by smtp.gmail.com with ESMTPSA id z8-20020a63b048000000b0053031f7a367sm722558pgo.85.2023.07.13.02.09.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jul 2023 02:09:48 -0700 (PDT) Date: Thu, 13 Jul 2023 09:09:44 +0000 From: Tomasz Figa To: Hsia-Jun Li Cc: Benjamin Gaignard , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, p.zabel@pengutronix.de, ming.qian@nxp.com, hverkuil-cisco@xs4all.nl, gregkh@linuxfoundation.org, ezequiel@vanguardiasur.com.ar, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-rockchip@lists.infradead.org, nicolas.dufresne@collabora.com, linux-staging@lists.linux.dev, kernel@collabora.com, mchehab@kernel.org, m.szyprowski@samsung.com, ayaka Subject: Re: [PATCH v3 10/11] media: v4l2: Add DELETE_BUF ioctl Message-ID: <20230713090944.3gxrxt7lqnozhu7r@chromium.org> References: <20230622131349.144160-1-benjamin.gaignard@collabora.com> <20230622131349.144160-11-benjamin.gaignard@collabora.com> <80a03c29-6f3d-43f1-755c-10f3ae2c2756@synaptics.com> <42a45bad-09c7-ffb6-49cb-29ec0826599d@collabora.com> <3b22fda9-4a0e-2c03-2f12-19e5e3239235@synaptics.com> <54833256-7d88-9316-4f0f-b8c57552cd7b@synaptics.com> Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <54833256-7d88-9316-4f0f-b8c57552cd7b@synaptics.com> On Fri, Jun 30, 2023 at 05:43:51PM +0800, Hsia-Jun Li wrote: > > On 6/27/23 16:47, Hsia-Jun Li wrote: > > CAUTION: Email originated externally, do not click links or open > > attachments unless you recognize the sender and know the content is > > safe. > > > > > > On 6/27/23 16:43, Benjamin Gaignard wrote: > > > CAUTION: Email originated externally, do not click links or open > > > attachments unless you recognize the sender and know the content is > > > safe. > > > > > > > > > Le 27/06/2023 à 09:30, Hsia-Jun Li a écrit : > > > > > > > > On 6/22/23 21:13, Benjamin Gaignard wrote: > > > > > CAUTION: Email originated externally, do not click links or open > > > > > attachments unless you recognize the sender and know the content is > > > > > safe. > > > > > > > > > > > > > > > VIDIOC_DELETE_BUF ioctl allows to delete a buffer from a queue. > > > > > > > > > > Signed-off-by: Benjamin Gaignard > > > > > --- > > > > >   .../userspace-api/media/v4l/user-func.rst     |  1 + > > > > >   .../media/v4l/vidioc-delete-buf.rst           | 51 > > > > > +++++++++++++++++++ > > > > >   .../media/common/videobuf2/videobuf2-core.c   | 33 ++++++++++++ > > > > >   .../media/common/videobuf2/videobuf2-v4l2.c   |  6 +++ > > > > >   drivers/media/v4l2-core/v4l2-dev.c            |  1 + > > > > >   drivers/media/v4l2-core/v4l2-ioctl.c          | 10 ++++ > > > > >   include/media/v4l2-ioctl.h                    |  4 ++ > > > > >   include/media/videobuf2-core.h                |  9 ++++ > > > > >   include/media/videobuf2-v4l2.h                | 11 ++++ > > > > >   include/uapi/linux/videodev2.h                |  2 + > > > > >   10 files changed, 128 insertions(+) > > > > >   create mode 100644 > > > > > Documentation/userspace-api/media/v4l/vidioc-delete-buf.rst > > > > > > > > > > diff --git a/Documentation/userspace-api/media/v4l/user-func.rst > > > > > b/Documentation/userspace-api/media/v4l/user-func.rst > > > > > index 15ff0bf7bbe6..8c74016e12fd 100644 > > > > > --- a/Documentation/userspace-api/media/v4l/user-func.rst > > > > > +++ b/Documentation/userspace-api/media/v4l/user-func.rst > > > > > @@ -17,6 +17,7 @@ Function Reference > > > > >       vidioc-dbg-g-chip-info > > > > >       vidioc-dbg-g-register > > > > >       vidioc-decoder-cmd > > > > > +    vidioc-delete-buf > > > > >       vidioc-dqevent > > > > >       vidioc-dv-timings-cap > > > > >       vidioc-encoder-cmd > > > > > diff --git > > > > > a/Documentation/userspace-api/media/v4l/vidioc-delete-buf.rst > > > > > b/Documentation/userspace-api/media/v4l/vidioc-delete-buf.rst > > > > > new file mode 100644 > > > > > index 000000000000..0e7ce58f91bc > > > > > --- /dev/null > > > > > +++ b/Documentation/userspace-api/media/v4l/vidioc-delete-buf.rst > > > > > @@ -0,0 +1,51 @@ > > > > > +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later > > > > > +.. c:namespace:: V4L > > > > > + > > > > > +.. _VIDIOC_DELETE_BUF: > > > > > + > > > > > +************************ > > > > > +ioctl VIDIOC_DELETE_BUF > > > > > +************************ > > > > > + > > > > > +Name > > > > > +==== > > > > > + > > > > > +VIDIOC_DELETE_BUF - Delete a buffer from a queue > > > > > + > > > > > +Synopsis > > > > > +======== > > > > > + > > > > > +.. c:macro:: VIDIOC_DELETE_BUF > > > > > + > > > > > +``int ioctl(int fd, VIDIOC_DELETE_BUF, struct v4l2_buffer *argp)`` > > > > > + > > > > > +Arguments > > > > > +========= > > > > > + > > > > > +``fd`` > > > > > +    File descriptor returned by :c:func:`open()`. > > > > > + > > > > > +``argp`` > > > > > +    Pointer to struct :c:type:`v4l2_buffer`. > > > > > + > > > > > +Description > > > > > +=========== > > > > > + > > > > > +Applications can optionally call the > > > > > :ref:`VIDIOC_DELETE_BUF` ioctl to > > > > > +delete a buffer from a queue. > > > > > + > > > > > +The struct :c:type:`v4l2_buffer` structure is specified in > > > > > +:ref:`buffer`. > > > > > + > > > > > +Return Value > > > > > +============ > > > > > + > > > > > +On success 0 is returned, on error -1 and the ``errno`` variable is > > > > > set > > > > > +appropriately. The generic error codes are described at the > > > > > +:ref:`Generic Error Codes ` chapter. > > > > > + > > > > > +EBUSY > > > > > +    File I/O is in progress. > > > > > + > > > > > +EINVAL > > > > > +    The buffer ``index`` doesn't exist in the queue. > > > > > diff --git a/drivers/media/common/videobuf2/videobuf2-core.c > > > > > b/drivers/media/common/videobuf2/videobuf2-core.c > > > > > index 899783f67580..aa546c972c3d 100644 > > > > > --- a/drivers/media/common/videobuf2/videobuf2-core.c > > > > > +++ b/drivers/media/common/videobuf2/videobuf2-core.c > > > > > @@ -1637,6 +1637,39 @@ int vb2_core_prepare_buf(struct vb2_queue *q, > > > > > unsigned int index, void *pb) > > > > >   } > > > > >   EXPORT_SYMBOL_GPL(vb2_core_prepare_buf); > > > > > > > > > > +int vb2_core_delete_buf(struct vb2_queue *q, unsigned int index) > > > > > +{ > > > > > +       struct vb2_buffer *vb; > > > > > + > > > > > +       vb = vb2_get_buffer(q, index); > > > > > +       if (!vb) { > > > > > +               dprintk(q, 1, "invalid buffer index %d\n", index); > > > > > +               return -EINVAL; > > > > > +       } > > > > > + > > > > > +       if (vb->state != VB2_BUF_STATE_DEQUEUED) { > > > > > +               dprintk(q, 1, "can't delete non dequeued buffer index > > > > > %d\n", index); > > > > > +               return -EINVAL; > > > > > +       } > > > > > + > > > > I know the driver could implement its own > > > > v4l2_ioctl_ops->vidioc_delete_buf() that check whether a buffer is > > > > used by the hardware as a future reference frame. > > > > But I think we need a flag to let the user know which buffer is still > > > > used by the hardware. > > > > Alternative ref case is safe, we only know it's existing when it is > > > > dequeued in current V4L2 buffer mechanism. > > > > While the Golden reference frame, such long term reference frame could > > > > last much longer. > > > > > > It is up to userland stack to know frames life time, it got the > > > information for that. > > > > That is true for the stateless codec driver. > > > > While application for stateful decoder could never do that. It also > > breaks what the document said: > > > > "The backing memory of |CAPTURE| buffers that are used as reference > > frames by the stream may be read by the hardware even after they are > > dequeued. Consequently, the client should avoid writing into this memory > > while the |CAPTURE| queue is streaming. Failure to observe this may > > result in corruption of decoded frames." > > > > > > > > > > +       if (vb->planes[0].mem_priv) > > > > > +               call_void_vb_qop(vb, buf_cleanup, vb); > > > > > + > > > > > +       /* Free MMAP buffers or release USERPTR buffers */ > > > > > +       if (q->memory == VB2_MEMORY_MMAP) > > > > > +               __vb2_buf_mem_free(vb); > > Here is another problem for the existing application, the mmap() from the > mmap offset or exportbuffer fd would not create a reference to buffer in > this step(while the exportbuffer would create one itself). > > When you delete a buffer, you may not release it from its virtual memory > space, leaving a corrupted virtual memory space. What do you mean? __vb2_buf_mem_free() doesn't unconditionally free the memory, it just decrements a reference counter. The VMA holds its own, so the buffer is only fully released when the application calls munmap(). Best regards, Tomasz > Also this behavior is > right, because mmap(2) says: > > "After  the  mmap()  call has returned, the file descriptor, fd, can be > closed immediately without invalidating the map‐ping." > > > > > > +       else if (q->memory == VB2_MEMORY_DMABUF) > > > > > +               __vb2_buf_dmabuf_put(vb); > > > > > +       else > > > > > +               __vb2_buf_userptr_put(vb); > > > > > + > > > > > +       vb2_queue_remove_buffer(q, vb); > > > > > +       kfree(vb); > > > > > + > > > > > +       dprintk(q, 2, "buffer %d deleted\n", index); > > > > > +       return 0; > > > > > +} > > > > > + > > > > >   /* > > > > >    * vb2_start_streaming() - Attempt to start streaming. > > > > >    * @q:         videobuf2 queue > > > > > diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c > > > > > b/drivers/media/common/videobuf2/videobuf2-v4l2.c > > > > > index 724135d41f7f..cea666c17b41 100644 > > > > > --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c > > > > > +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c > > > > > @@ -751,6 +751,12 @@ int vb2_prepare_buf(struct vb2_queue *q, struct > > > > > media_device *mdev, > > > > >   } > > > > >   EXPORT_SYMBOL_GPL(vb2_prepare_buf); > > > > > > > > > > +int vb2_delete_buf(struct vb2_queue *q, struct v4l2_buffer *b) > > > > > +{ > > > > > +       return vb2_core_delete_buf(q, b->index); > > > > > +} > > > > > +EXPORT_SYMBOL_GPL(vb2_delete_buf); > > > > > + > > > > >   int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers > > > > > *create) > > > > >   { > > > > >          unsigned requested_planes = 1; > > > > > diff --git a/drivers/media/v4l2-core/v4l2-dev.c > > > > > b/drivers/media/v4l2-core/v4l2-dev.c > > > > > index f81279492682..80ace2e1e932 100644 > > > > > --- a/drivers/media/v4l2-core/v4l2-dev.c > > > > > +++ b/drivers/media/v4l2-core/v4l2-dev.c > > > > > @@ -720,6 +720,7 @@ static void determine_valid_ioctls(struct > > > > > video_device *vdev) > > > > >                  SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, > > > > > vidioc_prepare_buf); > > > > >                  SET_VALID_IOCTL(ops, VIDIOC_STREAMON, > > > > > vidioc_streamon); > > > > >                  SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, > > > > > vidioc_streamoff); > > > > > +               SET_VALID_IOCTL(ops, VIDIOC_DELETE_BUF, > > > > > vidioc_delete_buf); > > > > >          } > > > > > > > > > >          if (is_vid || is_vbi || is_meta) { > > > > > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c > > > > > b/drivers/media/v4l2-core/v4l2-ioctl.c > > > > > index a858acea6547..1c737279d3ef 100644 > > > > > --- a/drivers/media/v4l2-core/v4l2-ioctl.c > > > > > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c > > > > > @@ -2156,6 +2156,15 @@ static int v4l_prepare_buf(const struct > > > > > v4l2_ioctl_ops *ops, > > > > >          return ret ? ret : ops->vidioc_prepare_buf(file, fh, b); > > > > >   } > > > > > > > > > > +static int v4l_delete_buf(const struct v4l2_ioctl_ops *ops, > > > > > +                         struct file *file, void *fh, void *arg) > > > > > +{ > > > > > +       struct v4l2_buffer *b = arg; > > > > > +       int ret = check_fmt(file, b->type); > > > > > + > > > > > +       return ret ? ret : ops->vidioc_delete_buf(file, fh, b); > > > > > +} > > > > > + > > > > >   static int v4l_g_parm(const struct v4l2_ioctl_ops *ops, > > > > >                                  struct file *file, void *fh, void > > > > > *arg) > > > > >   { > > > > > @@ -2905,6 +2914,7 @@ static const struct v4l2_ioctl_info > > > > > v4l2_ioctls[] = { > > > > >          IOCTL_INFO(VIDIOC_ENUM_FREQ_BANDS, v4l_enum_freq_bands, > > > > > v4l_print_freq_band, 0), > > > > >          IOCTL_INFO(VIDIOC_DBG_G_CHIP_INFO, v4l_dbg_g_chip_info, > > > > > v4l_print_dbg_chip_info, INFO_FL_CLEAR(v4l2_dbg_chip_info, match)), > > > > >          IOCTL_INFO(VIDIOC_QUERY_EXT_CTRL, v4l_query_ext_ctrl, > > > > > v4l_print_query_ext_ctrl, INFO_FL_CTRL | > > > > > INFO_FL_CLEAR(v4l2_query_ext_ctrl, id)), > > > > > +       IOCTL_INFO(VIDIOC_DELETE_BUF, v4l_delete_buf, > > > > > v4l_print_buffer, INFO_FL_QUEUE), > > > > >   }; > > > > >   #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls) > > > > > > > > > > diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h > > > > > index edb733f21604..2f232ed884c7 100644 > > > > > --- a/include/media/v4l2-ioctl.h > > > > > +++ b/include/media/v4l2-ioctl.h > > > > > @@ -163,6 +163,8 @@ struct v4l2_fh; > > > > >    *     :ref:`VIDIOC_CREATE_BUFS ` ioctl > > > > >    * @vidioc_prepare_buf: pointer to the function that implements > > > > >    *     :ref:`VIDIOC_PREPARE_BUF ` ioctl > > > > > + * @vidioc_delete_buf: pointer to the function that implements > > > > > + *     :ref:`VIDIOC_DELETE_BUF ` ioctl > > > > >    * @vidioc_overlay: pointer to the function that implements > > > > >    *     :ref:`VIDIOC_OVERLAY ` ioctl > > > > >    * @vidioc_g_fbuf: pointer to the function that implements > > > > > @@ -422,6 +424,8 @@ struct v4l2_ioctl_ops { > > > > >                                    struct v4l2_create_buffers *b); > > > > >          int (*vidioc_prepare_buf)(struct file *file, void *fh, > > > > >                                    struct v4l2_buffer *b); > > > > > +       int (*vidioc_delete_buf)(struct file *file, void *fh, > > > > > +                                struct v4l2_buffer *b); > > > > > > > > > >          int (*vidioc_overlay)(struct file *file, void *fh, unsigned > > > > > int i); > > > > >          int (*vidioc_g_fbuf)(struct file *file, void *fh, > > > > > diff --git a/include/media/videobuf2-core.h > > > > > b/include/media/videobuf2-core.h > > > > > index 080b783d608d..0f9e68f76b77 100644 > > > > > --- a/include/media/videobuf2-core.h > > > > > +++ b/include/media/videobuf2-core.h > > > > > @@ -840,6 +840,15 @@ int vb2_core_create_bufs(struct vb2_queue *q, > > > > > enum vb2_memory memory, > > > > >    */ > > > > >   int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, > > > > > void *pb); > > > > > > > > > > +/** > > > > > + * vb2_core_delete_buf() - > > > > > + * @q: pointer to &struct vb2_queue with videobuf2 queue. > > > > > + * @index:     id number of the buffer. > > > > > + * > > > > > + *  Return: returns zero on success; an error code otherwise. > > > > > + */ > > > > > +int vb2_core_delete_buf(struct vb2_queue *q, unsigned int index); > > > > > + > > > > >   /** > > > > >    * vb2_core_qbuf() - Queue a buffer from userspace > > > > >    * > > > > > diff --git a/include/media/videobuf2-v4l2.h > > > > > b/include/media/videobuf2-v4l2.h > > > > > index 88a7a565170e..3beeb4c735f0 100644 > > > > > --- a/include/media/videobuf2-v4l2.h > > > > > +++ b/include/media/videobuf2-v4l2.h > > > > > @@ -114,6 +114,17 @@ int vb2_create_bufs(struct vb2_queue *q, struct > > > > > v4l2_create_buffers *create); > > > > >    */ > > > > >   int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, > > > > >                      struct v4l2_buffer *b); > > > > > +/** > > > > > + * vb2_delete_buf() - Delete the buffer from the queue > > > > > + * > > > > > + * @q:         pointer to &struct vb2_queue with videobuf2 queue. > > > > > + * @b:         buffer structure passed from userspace to > > > > > + *             &v4l2_ioctl_ops->vidioc_delete_buf handler in driver > > > > > + * > > > > > + * The return values from this function are intended to be directly > > > > > returned > > > > > + * from &v4l2_ioctl_ops->vidioc_delete_buf handler in driver. > > > > > + */ > > > > > +int vb2_delete_buf(struct vb2_queue *q, struct v4l2_buffer *b); > > > > > > > > > >   /** > > > > >    * vb2_qbuf() - Queue a buffer from userspace > > > > > diff --git a/include/uapi/linux/videodev2.h > > > > > b/include/uapi/linux/videodev2.h > > > > > index aee75eb9e686..31bba1915642 100644 > > > > > --- a/include/uapi/linux/videodev2.h > > > > > +++ b/include/uapi/linux/videodev2.h > > > > > @@ -2702,6 +2702,8 @@ struct v4l2_create_buffers { > > > > >   #define VIDIOC_DBG_G_CHIP_INFO  _IOWR('V', 102, struct > > > > > v4l2_dbg_chip_info) > > > > > > > > > >   #define VIDIOC_QUERY_EXT_CTRL  _IOWR('V', 103, struct > > > > > v4l2_query_ext_ctrl) > > > > > +#define VIDIOC_DELETE_BUF      _IOWR('V', 104, struct v4l2_buffer) > > > > > + > > > > > > > > > >   /* Reminder: when adding new ioctls please add support for them to > > > > >      drivers/media/v4l2-core/v4l2-compat-ioctl32.c as well! */ > > > > > -- > > > > > 2.39.2 > > > > > > > -- > > Hsia-Jun(Randy) Li > > > -- > Hsia-Jun(Randy) Li > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AC135C001DC for ; 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[34.81.223.0]) by smtp.gmail.com with ESMTPSA id z8-20020a63b048000000b0053031f7a367sm722558pgo.85.2023.07.13.02.09.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jul 2023 02:09:48 -0700 (PDT) Date: Thu, 13 Jul 2023 09:09:44 +0000 From: Tomasz Figa To: Hsia-Jun Li Cc: Benjamin Gaignard , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, p.zabel@pengutronix.de, ming.qian@nxp.com, hverkuil-cisco@xs4all.nl, gregkh@linuxfoundation.org, ezequiel@vanguardiasur.com.ar, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-rockchip@lists.infradead.org, nicolas.dufresne@collabora.com, linux-staging@lists.linux.dev, kernel@collabora.com, mchehab@kernel.org, m.szyprowski@samsung.com, ayaka Subject: Re: [PATCH v3 10/11] media: v4l2: Add DELETE_BUF ioctl Message-ID: <20230713090944.3gxrxt7lqnozhu7r@chromium.org> References: <20230622131349.144160-1-benjamin.gaignard@collabora.com> <20230622131349.144160-11-benjamin.gaignard@collabora.com> <80a03c29-6f3d-43f1-755c-10f3ae2c2756@synaptics.com> <42a45bad-09c7-ffb6-49cb-29ec0826599d@collabora.com> <3b22fda9-4a0e-2c03-2f12-19e5e3239235@synaptics.com> <54833256-7d88-9316-4f0f-b8c57552cd7b@synaptics.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <54833256-7d88-9316-4f0f-b8c57552cd7b@synaptics.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230713_020952_537962_35A69BA0 X-CRM114-Status: GOOD ( 44.50 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org 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[34.81.223.0]) by smtp.gmail.com with ESMTPSA id z8-20020a63b048000000b0053031f7a367sm722558pgo.85.2023.07.13.02.09.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jul 2023 02:09:48 -0700 (PDT) Date: Thu, 13 Jul 2023 09:09:44 +0000 From: Tomasz Figa To: Hsia-Jun Li Cc: Benjamin Gaignard , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, p.zabel@pengutronix.de, ming.qian@nxp.com, hverkuil-cisco@xs4all.nl, gregkh@linuxfoundation.org, ezequiel@vanguardiasur.com.ar, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-rockchip@lists.infradead.org, nicolas.dufresne@collabora.com, linux-staging@lists.linux.dev, kernel@collabora.com, mchehab@kernel.org, m.szyprowski@samsung.com, ayaka Subject: Re: [PATCH v3 10/11] media: v4l2: Add DELETE_BUF ioctl Message-ID: <20230713090944.3gxrxt7lqnozhu7r@chromium.org> References: <20230622131349.144160-1-benjamin.gaignard@collabora.com> <20230622131349.144160-11-benjamin.gaignard@collabora.com> <80a03c29-6f3d-43f1-755c-10f3ae2c2756@synaptics.com> <42a45bad-09c7-ffb6-49cb-29ec0826599d@collabora.com> <3b22fda9-4a0e-2c03-2f12-19e5e3239235@synaptics.com> <54833256-7d88-9316-4f0f-b8c57552cd7b@synaptics.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <54833256-7d88-9316-4f0f-b8c57552cd7b@synaptics.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230713_020952_541494_64500FE7 X-CRM114-Status: GOOD ( 45.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gRnJpLCBKdW4gMzAsIDIwMjMgYXQgMDU6NDM6NTFQTSArMDgwMCwgSHNpYS1KdW4gTGkgd3Jv 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