This is a note to let you know that I've just added the patch titled dmaengine: stm32-dma: fix stm32_dma_get_max_width to the 5.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: dmaengine-stm32-dma-fix-stm32_dma_get_max_width.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit c9ca50a174f9b7635034e1ec18266a5a4d544ad2 Author: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx> Date: Mon Oct 11 11:42:58 2021 +0200 dmaengine: stm32-dma: fix stm32_dma_get_max_width [ Upstream commit b20fd5fa310cbf7ec367f263a34382a24c4cee73 ] 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@xxxxxxxxxxx> Link: https://lore.kernel.org/r/20211011094259.315023-3-amelie.delaunay@xxxxxxxxxxx Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c index 7dd1d3d0bf063..a5dab5510e625 100644 --- a/drivers/dma/stm32-dma.c +++ b/drivers/dma/stm32-dma.c @@ -268,7 +268,6 @@ 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; @@ -279,7 +278,7 @@ 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;