From: Russell King Date: Thu, 10 May 2012 22:39:27 +0000 (+0100) Subject: dmaengine: virt-dma: vchan_find_desc() X-Git-Tag: accepted/tizen/common/20141203.182822~4032^2~18 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fe045874aaf4480386c65baf1acae82af4c5e21f;p=platform%2Fkernel%2Flinux-arm64.git 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: Linus Walleij Signed-off-by: Russell King --- diff --git a/drivers/dma/virt-dma.c b/drivers/dma/virt-dma.c index bd85b05..a8054fc 100644 --- a/drivers/dma/virt-dma.c +++ b/drivers/dma/virt-dma.c @@ -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. diff --git a/drivers/dma/virt-dma.h b/drivers/dma/virt-dma.h index 825bb96..44ec57e 100644 --- a/drivers/dma/virt-dma.h +++ b/drivers/dma/virt-dma.h @@ -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