[PATCH -next] dmaengine: xilinx_dma: remove set but not used variable 'tail_segment'

[PATCH -next] dmaengine: xilinx_dma: remove set but not used variable 'tail_segment'

[YueHaibing]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/dma/xilinx/xilinx_dma.c: In function 'xilinx_vdma_start_transfer':
drivers/dma/xilinx/xilinx_dma.c:1104:33: warning:
 variable 'tail_segment' set but not used [-Wunused-but-set-variable]

It not used since commit b8349172b400 ("dmaengine: xilinx_dma: Drop SG support
for VDMA IP")

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/dma/xilinx/xilinx_dma.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index d9431af..c8acd34 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -1101,7 +1101,6 @@ static void xilinx_vdma_start_transfer(struct xilinx_dma_chan *chan)
 	struct xilinx_vdma_config *config = &chan->config;
 	struct xilinx_dma_tx_descriptor *desc, *tail_desc;
 	u32 reg, j;
-	struct xilinx_vdma_tx_segment *tail_segment;
 	struct xilinx_vdma_tx_segment *segment, *last = NULL;
 	int i = 0;
 
@@ -1120,9 +1119,6 @@ static void xilinx_vdma_start_transfer(struct xilinx_dma_chan *chan)
 	tail_desc = list_last_entry(&chan->pending_list,
 				    struct xilinx_dma_tx_descriptor, node);
 
-	tail_segment = list_last_entry(&tail_desc->segments,
-				       struct xilinx_vdma_tx_segment, node);
-
 	/* Configure the hardware using info in the config structure */
 	if (chan->has_vflip) {
 		reg = dma_read(chan, XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP);




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RE: [PATCH -next] dmaengine: xilinx_dma: remove set but not used variable 'tail_segment'

[Radhey Shyam Pandey]

> -----Original Message-----
> From: YueHaibing <yuehaibing@huawei.com>
> Sent: Wednesday, January 9, 2019 5:41 PM
> To: Vinod Koul <vkoul@kernel.org>; Dan Williams
> <dan.j.williams@intel.com>; Michal Simek <michals@xilinx.com>; Radhey
> Shyam Pandey <radheys@xilinx.com>; Andrea Merello
> <andrea.merello@gmail.com>; Appana Durga Kedareswara Rao
> <appanad@xilinx.com>
> Cc: YueHaibing <yuehaibing@huawei.com>; dmaengine@vger.kernel.org;
> linux-arm-kernel@lists.infradead.org; kernel-janitors@vger.kernel.org
> Subject: [PATCH -next] dmaengine: xilinx_dma: remove set but not used
> variable 'tail_segment'
> 
> Fixes gcc '-Wunused-but-set-variable' warning:
> 
> drivers/dma/xilinx/xilinx_dma.c: In function 'xilinx_vdma_start_transfer':
> drivers/dma/xilinx/xilinx_dma.c:1104:33: warning:
>  variable 'tail_segment' set but not used [-Wunused-but-set-variable]
> 
> It not used since commit b8349172b400 ("dmaengine: xilinx_dma: Drop SG
> support
> for VDMA IP")
> 
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Thanks for the patch.
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>

> ---
>  drivers/dma/xilinx/xilinx_dma.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
> index d9431af..c8acd34 100644
> --- a/drivers/dma/xilinx/xilinx_dma.c
> +++ b/drivers/dma/xilinx/xilinx_dma.c
> @@ -1101,7 +1101,6 @@ static void xilinx_vdma_start_transfer(struct
> xilinx_dma_chan *chan)
>  	struct xilinx_vdma_config *config = &chan->config;
>  	struct xilinx_dma_tx_descriptor *desc, *tail_desc;
>  	u32 reg, j;
> -	struct xilinx_vdma_tx_segment *tail_segment;
>  	struct xilinx_vdma_tx_segment *segment, *last = NULL;
>  	int i = 0;
> 
> @@ -1120,9 +1119,6 @@ static void xilinx_vdma_start_transfer(struct
> xilinx_dma_chan *chan)
>  	tail_desc = list_last_entry(&chan->pending_list,
>  				    struct xilinx_dma_tx_descriptor, node);
> 
> -	tail_segment = list_last_entry(&tail_desc->segments,
> -				       struct xilinx_vdma_tx_segment, node);
> -
>  	/* Configure the hardware using info in the config structure */
>  	if (chan->has_vflip) {
>  		reg = dma_read(chan,
> XILINX_VDMA_REG_ENABLE_VERTICAL_FLIP);
> 
> 


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Re: [PATCH -next] dmaengine: xilinx_dma: remove set but not used variable 'tail_segment'

[Vinod Koul]

On 09-01-19, 12:10, YueHaibing wrote:
> Fixes gcc '-Wunused-but-set-variable' warning:
> 
> drivers/dma/xilinx/xilinx_dma.c: In function 'xilinx_vdma_start_transfer':
> drivers/dma/xilinx/xilinx_dma.c:1104:33: warning:
>  variable 'tail_segment' set but not used [-Wunused-but-set-variable]
> 
> It not used since commit b8349172b400 ("dmaengine: xilinx_dma: Drop SG support
> for VDMA IP")

Applied, thanks

-- 
~Vinod

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