From b20fd5fa310cbf7ec367f263a34382a24c4cee73 Mon Sep 17 00:00:00 2001
From: Amelie Delaunay <amelie.delaunay@foss.st.com>
Date: Mon, 11 Oct 2021 11:42:58 +0200
Subject: [PATCH] dmaengine: stm32-dma: fix stm32_dma_get_max_width
Git-commit: b20fd5fa310cbf7ec367f263a34382a24c4cee73
Patch-mainline: v5.16-rc1
References: git-fixes stable-5.14.19

buf_addr parameter of stm32_dma_set_xfer_param function is a dma_addr_t.
We only need to check the remainder of buf_addr/max_width, so, no need to
use do_div and extra u64 addr. Use '%' instead.

Fixes: e0ebdbdcb42a ("dmaengine: stm32-dma: take address into account when computing max width")
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20211011094259.315023-3-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/dma/stm32-dma.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index a5ccf3fa95e0..6e4ef44941ef 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -270,7 +270,6 @@ static enum dma_slave_buswidth stm32_dma_get_max_width(u32 buf_len,
 						       u32 threshold)
 {
 	enum dma_slave_buswidth max_width;
-	u64 addr = buf_addr;
 
 	if (threshold == STM32_DMA_FIFO_THRESHOLD_FULL)
 		max_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
@@ -281,7 +280,7 @@ static enum dma_slave_buswidth stm32_dma_get_max_width(u32 buf_len,
 	       max_width > DMA_SLAVE_BUSWIDTH_1_BYTE)
 		max_width = max_width >> 1;
 
-	if (do_div(addr, max_width))
+	if (buf_addr % max_width)
 		max_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
 
 	return max_width;
-- 
2.26.2