dma-direct: fix data truncation in dma_direct_get_required_mask()

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The upper 32-bit physical address gets truncated inadvertently
when dma_direct_get_required_mask() invokes phys_to_dma_direct().
This results in dma_addressing_limited() return incorrect value
when used in platforms with LPAE enabled.
Fix it here by explicitly type casting 'max_pfn' to phys_addr_t
in order to prevent overflow of intermediate value while evaluating
'(max_pfn - 1) << PAGE_SHIFT'.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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Kishon Vijay Abraham I 2020-04-06 10:58:36 +05:30 • committed by Christoph Hellwig

parent f5e94d10e4

commit cdcda0d1f8

1 changed files with 2 additions and 1 deletions

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kernel/dma/direct.c

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