From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- .../media/mediactl/media-request-ioc-reinit.rst | 51 ++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 Documentation/userspace-api/media/mediactl/media-request-ioc-reinit.rst (limited to 'Documentation/userspace-api/media/mediactl/media-request-ioc-reinit.rst') diff --git a/Documentation/userspace-api/media/mediactl/media-request-ioc-reinit.rst b/Documentation/userspace-api/media/mediactl/media-request-ioc-reinit.rst new file mode 100644 index 000000000..57567b87b --- /dev/null +++ b/Documentation/userspace-api/media/mediactl/media-request-ioc-reinit.rst @@ -0,0 +1,51 @@ +.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later +.. c:namespace:: MC + +.. _media_request_ioc_reinit: + +****************************** +ioctl MEDIA_REQUEST_IOC_REINIT +****************************** + +Name +==== + +MEDIA_REQUEST_IOC_REINIT - Re-initialize a request + +Synopsis +======== + +.. c:macro:: MEDIA_REQUEST_IOC_REINIT + +``int ioctl(int request_fd, MEDIA_REQUEST_IOC_REINIT)`` + +Arguments +========= + +``request_fd`` + File descriptor returned by :ref:`MEDIA_IOC_REQUEST_ALLOC`. + +Description +=========== + +If the media device supports :ref:`requests `, then +this request ioctl can be used to re-initialize a previously allocated +request. + +Re-initializing a request will clear any existing data from the request. +This avoids having to :c:func:`close()` a completed +request and allocate a new request. Instead the completed request can just +be re-initialized and it is ready to be used again. + +A request can only be re-initialized if it either has not been queued +yet, or if it was queued and completed. Otherwise it will set ``errno`` +to ``EBUSY``. No other error codes can be returned. + +Return Value +============ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. + +EBUSY + The request is queued but not yet completed. -- cgit v1.2.3