[Patch 05/13] media: am437x-vpfe: Streamlined vb2 buffer cleanup

Benoit Parrot
2019-09-09T16:26:51Z

Returning queued vb2 buffers back to user space is a common
task best handled by a helper function.

Signed-off-by: Benoit Parrot <bparrot@ti.com>
---
drivers/media/platform/am437x/am437x-vpfe.c | 54 ++++++++++-----------
1 file changed, 26 insertions(+), 28 deletions(-)

diff --git a/drivers/media/platform/am437x/am437x-vpfe.c b/drivers/media/platform/am437x/am437x-vpfe.c
index 3a8ad9bdf283..52f7fc6e11dd 100644
--- a/drivers/media/platform/am437x/am437x-vpfe.c
+++ b/drivers/media/platform/am437x/am437x-vpfe.c
@@ -1949,6 +1949,29 @@ static void vpfe_buffer_queue(struct vb2_buffer *vb)
spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
}

+static void vpfe_return_all_buffers(struct vpfe_device *vpfe,
+ enum vb2_buffer_state state)
+{
+ struct vpfe_cap_buffer *buf, *node;
+ unsigned long flags;
+
+ spin_lock_irqsave(&vpfe->dma_queue_lock, flags);
+ list_for_each_entry_safe(buf, node, &vpfe->dma_queue, list) {
+ vb2_buffer_done(&buf->vb.vb2_buf, state);
+ list_del(&buf->list);
+ }
+
+ if (vpfe->cur_frm)
+ vb2_buffer_done(&vpfe->cur_frm->vb.vb2_buf, state);
+
+ if (vpfe->next_frm && vpfe->next_frm != vpfe->cur_frm)
+ vb2_buffer_done(&vpfe->next_frm->vb.vb2_buf, state);
+
+ vpfe->cur_frm = NULL;
+ vpfe->next_frm = NULL;
+ spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
+}
+
/*
* vpfe_start_streaming : Starts the DMA engine for streaming
* @vb: ptr to vb2_buffer
@@ -1957,7 +1980,6 @@ static void vpfe_buffer_queue(struct vb2_buffer *vb)
static int vpfe_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct vpfe_device *vpfe = vb2_get_drv_priv(vq);
- struct vpfe_cap_buffer *buf, *tmp;
struct vpfe_subdev_info *sdinfo;
unsigned long flags;
unsigned long addr;
@@ -2003,11 +2025,8 @@ static int vpfe_start_streaming(struct vb2_queue *vq, unsigned int count)
return 0;

err:
- list_for_each_entry_safe(buf, tmp, &vpfe->dma_queue, list) {
- list_del(&buf->list);
- vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
- }
-
+ vpfe_return_all_buffers(vpfe, VB2_BUF_STATE_QUEUED);
+ vpfe_pcr_enable(&vpfe->ccdc, 0);
return ret;
}

@@ -2022,7 +2041,6 @@ static void vpfe_stop_streaming(struct vb2_queue *vq)
{
struct vpfe_device *vpfe = vb2_get_drv_priv(vq);
struct vpfe_subdev_info *sdinfo;
- unsigned long flags;
int ret;

vpfe_pcr_enable(&vpfe->ccdc, 0);
@@ -2040,27 +2058,7 @@ static void vpfe_stop_streaming(struct vb2_queue *vq)
vpfe_dbg(1, vpfe, "stream off failed in subdev\n");

/* release all active buffers */
- spin_lock_irqsave(&vpfe->dma_queue_lock, flags);
- if (vpfe->cur_frm == vpfe->next_frm) {
- vb2_buffer_done(&vpfe->cur_frm->vb.vb2_buf,
- VB2_BUF_STATE_ERROR);
- } else {
- if (vpfe->cur_frm != NULL)
- vb2_buffer_done(&vpfe->cur_frm->vb.vb2_buf,
- VB2_BUF_STATE_ERROR);
- if (vpfe->next_frm != NULL)
- vb2_buffer_done(&vpfe->next_frm->vb.vb2_buf,
- VB2_BUF_STATE_ERROR);
- }
-
- while (!list_empty(&vpfe->dma_queue)) {
- vpfe->next_frm = list_entry(vpfe->dma_queue.next,
- struct vpfe_cap_buffer, list);
- list_del(&vpfe->next_frm->list);
- vb2_buffer_done(&vpfe->next_frm->vb.vb2_buf,
- VB2_BUF_STATE_ERROR);
- }
- spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
+ vpfe_return_all_buffers(vpfe, VB2_BUF_STATE_ERROR);
}

static int vpfe_g_pixelaspect(struct file *file, void *priv,
--
2.17.1