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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-05-10 23:39:27 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-07-01 14:15:22 +0100 |
| commit | fe045874aaf4480386c65baf1acae82af4c5e21f (patch) | |
| tree | 00bd605046eb02e925b710bc625b9f9b70fa3c94 /drivers | |
| parent | 50437bff7f7374f86837986f66e15e73a364f894 (diff) | |
| download | lwn-fe045874aaf4480386c65baf1acae82af4c5e21f.tar.gz lwn-fe045874aaf4480386c65baf1acae82af4c5e21f.zip | |
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 <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/virt-dma.c | 13 | ||||
| -rw-r--r-- | drivers/dma/virt-dma.h | 2 |
2 files changed, 14 insertions, 1 deletions
diff --git a/drivers/dma/virt-dma.c b/drivers/dma/virt-dma.c index bd85b052b481..a8054fc40cef 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 825bb9623175..44ec57e7e419 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 |