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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 <peter.ujfalusi@ti.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Peter Ujfalusi 2017-11-14 16:32:03 +02:00 committed by Vinod Koul
parent 4fbd8d194f
commit 6af149d2b1
2 changed files with 15 additions and 4 deletions
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5
drivers/dma/virt-dma.c
View File

@ -107,10 +107,7 @@ static void vchan_complete(unsigned long arg)
dmaengine_desc_get_callback(&vd->tx, &cb); dmaengine_desc_get_callback(&vd->tx, &cb);
list_del(&vd->node); list_del(&vd->node);
if (dmaengine_desc_test_reuse(&vd->tx)) vchan_vdesc_fini(vd);
list_add(&vd->node, &vc->desc_allocated);
else
vc->desc_free(vd);
dmaengine_desc_callback_invoke(&cb, NULL); dmaengine_desc_callback_invoke(&cb, NULL);
} }

14
drivers/dma/virt-dma.h
View File

@ -103,6 +103,20 @@ static inline void vchan_cookie_complete(struct virt_dma_desc *vd)
tasklet_schedule(&vc->task); 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 * vchan_cyclic_callback - report the completion of a period
* @vd: virtual descriptor * @vd: virtual descriptor