From 474809a28e7b0671a5090de6e0db91f0e3821360 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Thu, 30 Jan 2020 08:08:34 +0100 Subject: [PATCH] dmaengine: Fix return value for dma_request_chan() in case of failure Commit 71723a96b8b1 ("dmaengine: Create symlinks between DMA channels and slaves") changed the dma_request_chan() function flow in such a way that it always returns EPROBE_DEFER in case of channels that cannot be found. This break the operation of the devices which have optional DMA channels as it puts their drivers in endless deferred probe loop. Fix this by propagating the proper error value. Fixes: 71723a96b8b1 ("dmaengine: Create symlinks between DMA channels and slaves") Signed-off-by: Marek Szyprowski Reviewed-by: Geert Uytterhoeven Link: https://lore.kernel.org/r/20200130070834.17537-1-m.szyprowski@samsung.com [vkoul: fix typo in patch title] Signed-off-by: Vinod Koul --- drivers/dma/dmaengine.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index f3ef4ed..7b1cefc 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -759,7 +759,7 @@ struct dma_chan *dma_request_chan(struct device *dev, const char *name) if (!IS_ERR_OR_NULL(chan)) goto found; - return ERR_PTR(-EPROBE_DEFER); + return chan ? chan : ERR_PTR(-EPROBE_DEFER); found: chan->slave = dev; -- 2.7.4