From 3fe4f900bf3061b3994c56eea497d8a839241277 Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Thu, 5 May 2016 12:42:44 -0700 Subject: [PATCH] mtd: nand: sh_flctl: handle dma_submit() errors Some build tools noticed that 'cookie' is being set but not used. Might as well catch the errors here and handle them the same way we handle other DMA prep steps. Signed-off-by: Brian Norris Signed-off-by: Boris Brezillon --- drivers/mtd/nand/sh_flctl.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c index 6fa3bcd59769..442ce619b3b6 100644 --- a/drivers/mtd/nand/sh_flctl.c +++ b/drivers/mtd/nand/sh_flctl.c @@ -397,7 +397,7 @@ static int flctl_dma_fifo0_transfer(struct sh_flctl *flctl, unsigned long *buf, struct dma_chan *chan; enum dma_transfer_direction tr_dir; dma_addr_t dma_addr; - dma_cookie_t cookie = -EINVAL; + dma_cookie_t cookie; uint32_t reg; int ret; @@ -423,6 +423,12 @@ static int flctl_dma_fifo0_transfer(struct sh_flctl *flctl, unsigned long *buf, desc->callback = flctl_dma_complete; desc->callback_param = flctl; cookie = dmaengine_submit(desc); + if (dma_submit_error(cookie)) { + ret = dma_submit_error(cookie); + dev_warn(&flctl->pdev->dev, + "DMA submit failed, falling back to PIO\n"); + goto out; + } dma_async_issue_pending(chan); } else { -- 2.20.1