git/linux-net
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/ synced 2026-05-02 18:15:03 -04:00
Code Issues Packages Projects Releases Wiki Activity

dmaengine: virt-dma: vchan_find_desc()

Browse Source 
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>
This commit is contained in:
Russell King
2012-05-10 23:39:27 +01:00
parent 50437bff7f
commit fe045874aa
2 changed files with 14 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/dma/virt-dma.c
View File

@@ -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.