[PATCH] fpga: zynqpl: fix buffer alignment

[Michael Walle]

Due to pointer arithmetic, "sizeof(u32) * ARCH_DMA_MINALIGN" is
subtracted. It seems that the original intention was to just subtract
ARCH_DMA_MINALIGN. Fix it.

Signed-off-by: Michael Walle <michael at walle.cc>
---
 drivers/fpga/zynqpl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/fpga/zynqpl.c b/drivers/fpga/zynqpl.c
index a11e485525..2de40109a8 100644
--- a/drivers/fpga/zynqpl.c
+++ b/drivers/fpga/zynqpl.c
@@ -315,7 +315,7 @@ static u32 *zynq_align_dma_buffer(u32 *buf, u32 len, u32 swap)
 		if (new_buf > buf) {
 			debug("%s: Aligned buffer is after buffer start\n",
 			      __func__);
-			new_buf -= ARCH_DMA_MINALIGN;
+			new_buf = (u32 *)((u32)new_buf - ARCH_DMA_MINALIGN);
 		}
 		printf("%s: Align buffer at %x to %x(swap %d)\n", __func__,
 		       (u32)buf, (u32)new_buf, swap);
-- 
2.20.1