From 6af149d2b1422e0e873d8558274713e6f63142c2 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Tue, 14 Nov 2017 16:32:03 +0200 Subject: dmaengine: virt-dma: Add helper to free/reuse a descriptor The vchan_vdesc_fini() can be used to free or reuse a given descriptor after it has been marked as completed. Signed-off-by: Peter Ujfalusi Reviewed-by: Linus Walleij Signed-off-by: Vinod Koul --- drivers/dma/virt-dma.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'drivers/dma/virt-dma.h') diff --git a/drivers/dma/virt-dma.h b/drivers/dma/virt-dma.h index 3f776a46a29c..2edb05505102 100644 --- a/drivers/dma/virt-dma.h +++ b/drivers/dma/virt-dma.h @@ -103,6 +103,20 @@ static inline void vchan_cookie_complete(struct virt_dma_desc *vd) tasklet_schedule(&vc->task); } +/** + * vchan_vdesc_fini - Free or reuse a descriptor + * @vd: virtual descriptor to free/reuse + */ +static inline void vchan_vdesc_fini(struct virt_dma_desc *vd) +{ + struct virt_dma_chan *vc = to_virt_chan(vd->tx.chan); + + if (dmaengine_desc_test_reuse(&vd->tx)) + list_add(&vd->node, &vc->desc_allocated); + else + vc->desc_free(vd); +} + /** * vchan_cyclic_callback - report the completion of a period * @vd: virtual descriptor -- cgit v1.2.3