lkml.org 
[lkml]   [2017]   [Dec]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 21/67] dma-mapping: warn when there is no coherent_dma_mask
Date
These days all devices should have a DMA coherent mask, and most dma_ops
implementations rely on that fact. But just to be sure add an assert to
ring the warning bell if that is not the case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
include/linux/dma-mapping.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index e77e2dec4723..2779d544485c 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -520,6 +520,7 @@ static inline void *dma_alloc_attrs(struct device *dev, size_t size,
void *cpu_addr;

BUG_ON(!ops);
+ WARN_ON_ONCE(!dev->coherent_dma_mask);

if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
return cpu_addr;
--
2.14.2
\
 
 \ /
  Last update: 2017-12-29 09:37    [W:0.508 / U:0.240 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site