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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/dma/virt-dma.c | |
| 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/dma/virt-dma.c')
| -rw-r--r-- | drivers/dma/virt-dma.c | 13 |
1 files changed, 13 insertions, 0 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. |