dma: at_hdmac: check direction properly for cyclic transfers

dma_transfer_direction is a normal enum. It means we can't usually use the
values as bit fields. Let's adjust this check and move it above the usage of
the direction parameter, due to the nature of the following usage of it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 13a02f4425b0db386c0bca43f7e019a099d26c92..6e13f262139a89acabf4c512ce8461d62e810a61 100644 (file)
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -778,7 +778,7 @@ err:
  */
 static int
 atc_dma_cyclic_check_values(unsigned int reg_width, dma_addr_t buf_addr,
-               size_t period_len, enum dma_transfer_direction direction)
+               size_t period_len)
 {
        if (period_len > (ATC_BTSIZE_MAX << reg_width))
                goto err_out;
@@ -786,8 +786,6 @@ atc_dma_cyclic_check_values(unsigned int reg_width, dma_addr_t buf_addr,
                goto err_out;
        if (unlikely(buf_addr & ((1 << reg_width) - 1)))
                goto err_out;
-       if (unlikely(!(direction & (DMA_DEV_TO_MEM | DMA_MEM_TO_DEV))))
-               goto err_out;
 
        return 0;
 
@@ -886,14 +884,16 @@ atc_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
                return NULL;
        }
 
+       if (unlikely(!is_slave_direction(direction)))
+               goto err_out;
+
        if (sconfig->direction == DMA_MEM_TO_DEV)
                reg_width = convert_buswidth(sconfig->dst_addr_width);
        else
                reg_width = convert_buswidth(sconfig->src_addr_width);
 
        /* Check for too big/unaligned periods and unaligned DMA buffer */
-       if (atc_dma_cyclic_check_values(reg_width, buf_addr,
-                                       period_len, direction))
+       if (atc_dma_cyclic_check_values(reg_width, buf_addr, period_len))
                goto err_out;
 
        /* build cyclic linked list */