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Commit fe045874 authored by Russell King's avatar Russell King
Browse files

dmaengine: virt-dma: vchan_find_desc() 



Add a function to find a descriptor within the depths of the
virtualized DMA channel support.  Needed for tx_status functionality.

Tested-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 50437bff

drivers/dma/virt-dma.c

+13 −0
Original line number Diff line number Diff line
@@ -39,6 +39,19 @@ dma_cookie_t vchan_tx_submit(struct dma_async_tx_descriptor *tx) 
}

EXPORT_SYMBOL_GPL(vchan_tx_submit);



struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *vc,

	dma_cookie_t cookie)

{

	struct virt_dma_desc *vd;



	list_for_each_entry(vd, &vc->desc_issued, node)

		if (vd->tx.cookie == cookie)

			return vd;



	return NULL;

}

EXPORT_SYMBOL_GPL(vchan_find_desc);



/*

 * This tasklet handles the completion of a DMA descriptor by

 * calling its callback and freeing it.

drivers/dma/virt-dma.h

+1 −1
Original line number Diff line number Diff line
@@ -40,8 +40,8 @@ static inline struct virt_dma_chan *to_virt_chan(struct dma_chan *chan) 
}



void vchan_dma_desc_free_list(struct virt_dma_chan *vc, struct list_head *head);



void vchan_init(struct virt_dma_chan *vc, struct dma_device *dmadev);

struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *, dma_cookie_t);



/**

 * vchan_tx_prep - prepare a descriptor