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56 lines
1.8 KiB
Diff
56 lines
1.8 KiB
Diff
From 2a099853599054a17621463365f7bd48223e0e4c Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.org>
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Date: Fri, 28 Jun 2019 11:30:49 +0100
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Subject: [PATCH 692/725] Revert "media: vb2: Allow reqbufs(0) with "in use"
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MMAP buffers"
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This reverts commit a2c73e18c1f657de6d654f51effa0a94863abbd8.
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An alternative version was accepted upstream. Revert this patch to
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apply that one.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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---
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.../media/common/videobuf2/videobuf2-core.c | 23 +++++++++++++++++++
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1 file changed, 23 insertions(+)
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--- a/drivers/media/common/videobuf2/videobuf2-core.c
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+++ b/drivers/media/common/videobuf2/videobuf2-core.c
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@@ -554,6 +554,20 @@ bool vb2_buffer_in_use(struct vb2_queue
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}
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EXPORT_SYMBOL(vb2_buffer_in_use);
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+/*
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+ * __buffers_in_use() - return true if any buffers on the queue are in use and
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+ * the queue cannot be freed (by the means of REQBUFS(0)) call
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+ */
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+static bool __buffers_in_use(struct vb2_queue *q)
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+{
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+ unsigned int buffer;
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+ for (buffer = 0; buffer < q->num_buffers; ++buffer) {
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+ if (vb2_buffer_in_use(q, q->bufs[buffer]))
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+ return true;
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+ }
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+ return false;
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+}
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+
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void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb)
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{
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call_void_bufop(q, fill_user_buffer, q->bufs[index], pb);
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@@ -665,7 +679,16 @@ int vb2_core_reqbufs(struct vb2_queue *q
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if (*count == 0 || q->num_buffers != 0 ||
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(q->memory != VB2_MEMORY_UNKNOWN && q->memory != memory)) {
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+ /*
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+ * We already have buffers allocated, so first check if they
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+ * are not in use and can be freed.
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+ */
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mutex_lock(&q->mmap_lock);
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+ if (q->memory == VB2_MEMORY_MMAP && __buffers_in_use(q)) {
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+ mutex_unlock(&q->mmap_lock);
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+ dprintk(1, "memory in use, cannot free\n");
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+ return -EBUSY;
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+ }
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/*
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* Call queue_cancel to clean up any buffers in the PREPARED or
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