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dma-mapping fixes for 5.7

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- fix an integer truncation in dma_direct_get_required_mask
    (Kishon Vijay Abraham)
  - fix the display of dma mapping types (Grygorii Strashko)
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Merge tag 'dma-mapping-5.7-1' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:

 - fix an integer truncation in dma_direct_get_required_mask
   (Kishon Vijay Abraham)

 - fix the display of dma mapping types (Grygorii Strashko)

* tag 'dma-mapping-5.7-1' of git://git.infradead.org/users/hch/dma-mapping:
  dma-debug: fix displaying of dma allocation type
  dma-direct: fix data truncation in dma_direct_get_required_mask()
This commit is contained in:
Linus Torvalds 2020-04-11 11:34:36 -07:00
commit 75e7188397
2 changed files with 8 additions and 4 deletions
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9
kernel/dma/debug.c
View file

@ -137,9 +137,12 @@ static const char *const maperr2str[] = {
[MAP_ERR_CHECKED] = "dma map error checked",
};
static const char *type2name[5] = { "single", "page",
"scather-gather", "coherent",
"resource" };
static const char *type2name[] = {
[dma_debug_single] = "single",
[dma_debug_sg] = "scather-gather",
[dma_debug_coherent] = "coherent",
[dma_debug_resource] = "resource",
};
static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
"DMA_FROM_DEVICE", "DMA_NONE" };

3
kernel/dma/direct.c
View file

@ -39,7 +39,8 @@ static inline struct page *dma_direct_to_page(struct device *dev,
u64 dma_direct_get_required_mask(struct device *dev)
{
u64 max_dma = phys_to_dma_direct(dev, (max_pfn - 1) << PAGE_SHIFT);
phys_addr_t phys = (phys_addr_t)(max_pfn - 1) << PAGE_SHIFT;
u64 max_dma = phys_to_dma_direct(dev, phys);
return (1ULL << (fls64(max_dma) - 1)) * 2 - 1;
}