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    SubjectRe: [PATCH] dma-mapping: fix sync_single_range_* DMA debugging
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    On Sat, 15 Oct 2011 23:09:51 +0200
    Clemens Ladisch <clemens@ladisch.de> wrote:

    > Commit 5fd75a7850b5 (dma-mapping: remove unnecessary sync_single_range_*
    > in dma_map_ops) unified not only the dma_map_ops but also the
    > corresponding debug_dma_sync_* calls. This led to spurious WARN()ings
    > like the following because the DMA debug code was no longer able to
    > detect the DMA buffer base address without the separate offset parameter:
    >
    > WARNING: at lib/dma-debug.c:911 check_sync+0xce/0x446()
    > firewire_ohci 0000:04:00.0: DMA-API: device driver tries to sync DMA memory it has not allocated [device address=0x00000000cedaa400] [size=1024 bytes]
    > Call Trace: ...
    > [<ffffffff811326a5>] check_sync+0xce/0x446
    > [<ffffffff81132ad9>] debug_dma_sync_single_for_device+0x39/0x3b
    > [<ffffffffa01d6e6a>] ohci_queue_iso+0x4f3/0x77d [firewire_ohci]
    > ...
    >
    > To fix this, unshare the sync_single_* and sync_single_range_*
    > implementations so that we are able to call the correct debug_dma_sync_*
    > functions.
    >
    > Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
    > ---
    > include/asm-generic/dma-mapping-common.h | 14 ++++++++++++--
    > 1 files changed, 12 insertions(+), 2 deletions(-)

    Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>



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