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dmaengine: stm32-dmamux: Simplify code and save a few bytes of memory 

STM32_DMAMUX_MAX_DMA_REQUESTS is small (i.e. 32) and when the 'dma_inuse'
bitmap is allocated, there is already a check that 'dma_req' is <= this
limit.

So, there is no good reason to dynamically allocate this bitmap. This
just waste some memory and some cycles.

Use DECLARE_BITMAP with the maximum bitmap size instead.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/2d8c24359b2daa32ce0597a2949b7b2bebaf23de.1659211633.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Christophe JAILLET 2022-07-30 22:07:45 +02:00 committed by Vinod Koul
parent e1c9832b09
commit 8c79fd35e1
1 changed files with 1 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/dma/stm32-dmamux.c
View File

@ -39,7 +39,7 @@ struct stm32_dmamux_data {
u32 dma_requests; /* Number of DMA requests connected to DMAMUX */
u32 dmamux_requests; /* Number of DMA requests routed toward DMAs */
spinlock_t lock; /* Protects register access */
unsigned long *dma_inuse; /* Used DMA channel */
DECLARE_BITMAP(dma_inuse, STM32_DMAMUX_MAX_DMA_REQUESTS); /* Used DMA channel */
u32 ccr[STM32_DMAMUX_MAX_DMA_REQUESTS]; /* Used to backup CCR register
* in suspend
*/
@ -229,12 +229,6 @@ static int stm32_dmamux_probe(struct platform_device *pdev)
stm32_dmamux->dma_requests = dma_req;
stm32_dmamux->dma_reqs[0] = count;
stm32_dmamux->dma_inuse = devm_kcalloc(&pdev->dev,
BITS_TO_LONGS(dma_req),
sizeof(unsigned long),
GFP_KERNEL);
if (!stm32_dmamux->dma_inuse)
return -ENOMEM;
if (device_property_read_u32(&pdev->dev, "dma-requests",
&stm32_dmamux->dmamux_requests)) {