linux-kernel - [PATCH 2/4] dma-mapping: don't return errors from dma_set_min_align

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Message-ID: <20240824034925.1163244-3-hch@lst.de>
Date: Sat, 24 Aug 2024 05:49:13 +0200
From: Christoph Hellwig <hch@....de>
To: iommu@...ts.linux.dev
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>,
	Robin Murphy <robin.murphy@....com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	dmaengine@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	linux-media@...r.kernel.org,
	linux-mmc@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-hyperv@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH 2/4] dma-mapping: don't return errors from dma_set_min_align_mask

A NULL dev->dma_parms indicates either a bus that is not DMA capable or
grave bug in the implementation of the bus code.

There isn't much the driver can do in terms of error handling for either
case, so just warn and continue as DMA operations will fail anyway.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Robin Murphy <robin.murphy@....com>
---
 include/linux/dma-mapping.h | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index f693aafe221f2c..cfd6bafec3f944 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -575,13 +575,12 @@ static inline unsigned int dma_get_min_align_mask(struct device *dev)
 	return 0;
 }
 
-static inline int dma_set_min_align_mask(struct device *dev,
+static inline void dma_set_min_align_mask(struct device *dev,
 		unsigned int min_align_mask)
 {
 	if (WARN_ON_ONCE(!dev->dma_parms))
-		return -EIO;
+		return;
 	dev->dma_parms->min_align_mask = min_align_mask;
-	return 0;
 }
 
 #ifndef dma_get_cache_alignment
-- 
2.43.0