![Russell King - ARM Linux](/assets/img/avatar_default.png)
Everyone deals with assigning DMA cookies in the same way (it's part of the API so they should be), so lets consolidate the common code into a helper function to avoid this duplication. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Tested-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Jassi Brar <jassisinghbrar@gmail.com> [imx-sdma.c & mxs-dma.c] Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
31 lines
740 B
C
31 lines
740 B
C
/*
|
|
* The contents of this file are private to DMA engine drivers, and is not
|
|
* part of the API to be used by DMA engine users.
|
|
*/
|
|
#ifndef DMAENGINE_H
|
|
#define DMAENGINE_H
|
|
|
|
#include <linux/dmaengine.h>
|
|
|
|
/**
|
|
* dma_cookie_assign - assign a DMA engine cookie to the descriptor
|
|
* @tx: descriptor needing cookie
|
|
*
|
|
* Assign a unique non-zero per-channel cookie to the descriptor.
|
|
* Note: caller is expected to hold a lock to prevent concurrency.
|
|
*/
|
|
static inline dma_cookie_t dma_cookie_assign(struct dma_async_tx_descriptor *tx)
|
|
{
|
|
struct dma_chan *chan = tx->chan;
|
|
dma_cookie_t cookie;
|
|
|
|
cookie = chan->cookie + 1;
|
|
if (cookie < DMA_MIN_COOKIE)
|
|
cookie = DMA_MIN_COOKIE;
|
|
tx->cookie = chan->cookie = cookie;
|
|
|
|
return cookie;
|
|
}
|
|
|
|
#endif
|