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v4l2loopback: Allow unmapped buffers

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Allow dequeuing buffers that are not mapped. It is not uncommon
for clients to map the buffer only when they are ready to read it.

JIRA SHLD2-370

Change-Id: I6d815c6bbfd0a640a2e575d6da26d5019dd7f756
Signed-off-by: Illia Ragozin <iragozin@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3267279
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: svcacv <svcacv@nvidia.com>
This commit is contained in:
Illia Ragozin
2024-12-12 19:05:13 +00:00
committed by Jon Hunter
parent ff7cf02ef2
commit 2e69020353
1 changed files with 3 additions and 3 deletions
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6
drivers/media/platform/tegra/v4l2loopback/v4l2loopback.c
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@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0+
// SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
/* -*- c-file-style: "linux" -*- */
/*
@@ -62,6 +62,7 @@ MODULE_AUTHOR("Vasily Levin, "
"Stefan Diewald,"
"Anton Novikov"
"et al.");
MODULE_AUTHOR("NVIDIA Corporation");
#ifdef SNAPSHOT_VERSION
MODULE_VERSION(__stringify(SNAPSHOT_VERSION));
#else
@@ -1868,8 +1869,7 @@ static int vidioc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
(long long)(opener->read_position - 1), index);
if (!(dev->buffers[index].buffer.flags &
V4L2_BUF_FLAG_MAPPED)) {
dprintk("trying to return not mapped buf[%d]\n", index);
return -EINVAL;
dprintk("returning not mapped buf[%d]\n", index);
}
unset_flags(&dev->buffers[index]);
*buf = dev->buffers[index].buffer;