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media: rpivid: Ensure IRQs have completed before uniniting context

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Before uniniting the decode context sync with the IRQ queues to ensure
that decode no longer has any buffers in use.  This fixes a problem that
manifested as ffmpeg leaking CMA buffers when it did a stream off on
OUTPUT before CAPTURE, though in reality it was probably much more
dangerous than that.

Signed-off-by: John Cox <jc@kynesim.co.uk>
This commit is contained in:
John Cox
2021-09-22 19:05:30 +01:00
committed by Dom Cobley
parent 5233dc331e
commit 1774a95d9c
1 changed files with 54 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
drivers/staging/media/rpivid/rpivid_h265.c
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@@ -2387,12 +2387,50 @@ static void dec_state_delete(struct rpivid_ctx *const ctx)
kfree(s);
}
static void rpivid_h265_stop(struct rpivid_ctx *ctx)
{
struct rpivid_dev *const dev = ctx->dev;
unsigned int i;
struct irq_sync {
atomic_t done;
wait_queue_head_t wq;
struct rpivid_hw_irq_ent irq_ent;
};
v4l2_info(&dev->v4l2_dev, "%s\n", __func__);
static void phase2_sync_claimed(struct rpivid_dev *const dev, void *v)
{
struct irq_sync *const sync = v;
atomic_set(&sync->done, 1);
wake_up(&sync->wq);
}
static void phase1_sync_claimed(struct rpivid_dev *const dev, void *v)
{
struct irq_sync *const sync = v;
rpivid_hw_irq_active1_enable_claim(dev, 1);
rpivid_hw_irq_active2_claim(dev, &sync->irq_ent, phase2_sync_claimed, sync);
}
/* Sync with IRQ operations
*
* Claims phase1 and phase2 in turn and waits for the phase2 claim so any
* pending IRQ ops will have completed by the time this returns
*
* phase1 has counted enables so must reenable once claimed
* phase2 has unlimited enables
*/
static void irq_sync(struct rpivid_dev *const dev)
{
struct irq_sync sync;
atomic_set(&sync.done, 0);
init_waitqueue_head(&sync.wq);
rpivid_hw_irq_active1_claim(dev, &sync.irq_ent, phase1_sync_claimed, &sync);
wait_event(sync.wq, atomic_read(&sync.done));
}
static void h265_ctx_uninit(struct rpivid_dev *const dev, struct rpivid_ctx *ctx)
{
unsigned int i;
dec_env_uninit(ctx);
dec_state_delete(ctx);
@@ -2409,6 +2447,16 @@ static void rpivid_h265_stop(struct rpivid_ctx *ctx)
gptr_free(dev, ctx->coeff_bufs + i);
}
static void rpivid_h265_stop(struct rpivid_ctx *ctx)
{
struct rpivid_dev *const dev = ctx->dev;
v4l2_info(&dev->v4l2_dev, "%s\n", __func__);
irq_sync(dev);
h265_ctx_uninit(dev, ctx);
}
static int rpivid_h265_start(struct rpivid_ctx *ctx)
{
struct rpivid_dev *const dev = ctx->dev;
@@ -2470,7 +2518,7 @@ static int rpivid_h265_start(struct rpivid_ctx *ctx)
return 0;
fail:
rpivid_h265_stop(ctx);
h265_ctx_uninit(dev, ctx);
return -ENOMEM;
}