dma: Make the 'mask' parameter of __dma_request_channel const

The 'mask' parameter is not modified in __dma_request_channel and really
shouldn't be. Make this explicit by making the parameter const.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index b2728d6ba2fd..d07ef7dc04ec 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -174,7 +174,8 @@ static struct class dma_devclass = {
 #define dma_device_satisfies_mask(device, mask) \
         __dma_device_satisfies_mask((device), &(mask))
 static int
-__dma_device_satisfies_mask(struct dma_device *device, dma_cap_mask_t *want)
+__dma_device_satisfies_mask(struct dma_device *device,
+                            const dma_cap_mask_t *want)
 {
         dma_cap_mask_t has;
 
@@ -463,7 +464,8 @@ static void dma_channel_rebalance(void)
                 }
 }
 
-static struct dma_chan *private_candidate(dma_cap_mask_t *mask, struct dma_device *dev,
+static struct dma_chan *private_candidate(const dma_cap_mask_t *mask,
+                                          struct dma_device *dev,
                                           dma_filter_fn fn, void *fn_param)
 {
         struct dma_chan *chan;
@@ -505,7 +507,8 @@ static struct dma_chan *private_candidate(dma_cap_mask_t *mask, struct dma_devic
  * @fn: optional callback to disposition available channels
  * @fn_param: opaque parameter to pass to dma_filter_fn
  */
-struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, void *fn_param)
+struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
+                                       dma_filter_fn fn, void *fn_param)
 {
         struct dma_device *device, *_d;
         struct dma_chan *chan = NULL;