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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-01-19 11:05:57 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-02-03 18:24:40 -0600 |
| commit | 96b3ce5cd4186b58085c03412416e9d540e90183 (patch) | |
| tree | b3f0581190accf68cc221ab3253161dd588b3e50 /arch/frv | |
| parent | bad73b66c3862db14a5362113df7680f4ef84200 (diff) | |
| download | lwn-96b3ce5cd4186b58085c03412416e9d540e90183.tar.gz lwn-96b3ce5cd4186b58085c03412416e9d540e90183.zip | |
ARM: DMA: Fix struct page iterator in dma_cache_maint() to work with sparsemem
commit 15653371c67c3fbe359ae37b720639dd4c7b42c5 upstream.
Subhash Jadavani reported this partial backtrace:
Now consider this call stack from MMC block driver (this is on the ARMv7
based board):
[<c001b50c>] (v7_dma_inv_range+0x30/0x48) from [<c0017b8c>] (dma_cache_maint_page+0x1c4/0x24c)
[<c0017b8c>] (dma_cache_maint_page+0x1c4/0x24c) from [<c0017c28>] (___dma_page_cpu_to_dev+0x14/0x1c)
[<c0017c28>] (___dma_page_cpu_to_dev+0x14/0x1c) from [<c0017ff8>] (dma_map_sg+0x3c/0x114)
This is caused by incrementing the struct page pointer, and running off
the end of the sparsemem page array. Fix this by incrementing by pfn
instead, and convert the pfn to a struct page.
Suggested-by: James Bottomley <JBottomley@Parallels.com>
Tested-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/frv')
0 files changed, 0 insertions, 0 deletions