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Commit 6af149d2 authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Vinod Koul
Browse files

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: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 4fbd8d19

drivers/dma/virt-dma.c

+1 −4
Original line number Diff line number Diff line
@@ -107,10 +107,7 @@ static void vchan_complete(unsigned long arg) 
		dmaengine_desc_get_callback(&vd->tx, &cb);



		list_del(&vd->node);

		if (dmaengine_desc_test_reuse(&vd->tx))

			list_add(&vd->node, &vc->desc_allocated);

		else

			vc->desc_free(vd);

		vchan_vdesc_fini(vd);



		dmaengine_desc_callback_invoke(&cb, NULL);

	}

drivers/dma/virt-dma.h

+14 −0
Original line number Diff line number Diff line
@@ -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