diff options
| author | Russell King - ARM Linux <linux@arm.linux.org.uk> | 2012-03-06 22:34:46 +0000 |
|---|---|---|
| committer | Simone Willett <swillett@nvidia.com> | 2012-04-03 09:36:08 -0700 |
| commit | 06b90e947bb4ad4b08bc925baa7b5d780a982cca (patch) | |
| tree | e563537247ad6452303558208cb704c913ec1ec5 /drivers/dma/dmaengine.h | |
| parent | a9c8e4be12e9de9a1f1be15eab9e997c5c71b44f (diff) | |
dmaengine: consolidate assignment of DMA cookies
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.
Change-Id: I730882ff0f84f9ae42dd137a8926b7ae10868370
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>
(cherry picked from mainline commit 884485e1f12dcd39390f042e772cdbefc9ebb750)
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Change-Id: Ifc4a395a5dbafad03f8b28e052ad0e7ea5d90163
Reviewed-on: http://git-master/r/93780
Reviewed-by: Automatic_Commit_Validation_User
Diffstat (limited to 'drivers/dma/dmaengine.h')
| -rw-r--r-- | drivers/dma/dmaengine.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/dma/dmaengine.h b/drivers/dma/dmaengine.h index 968570dde2eb..7692c8644045 100644 --- a/drivers/dma/dmaengine.h +++ b/drivers/dma/dmaengine.h @@ -7,4 +7,24 @@ #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 |