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SubjectRe: [PATCH] MMC: at91_mci: modify cache flush routines
Le 12/05/2010 23:19, Andrew Morton :
> On Tue, 11 May 2010 19:09:53 +0200
> Nicolas Ferre <nicolas.ferre@atmel.com> wrote:
>
>> As we were using an internal dma flushing routine, this patch changes to the
>> DMA API flush_kernel_dcache_page(). Driver is able to compile now.
>>
>> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
>> ---
>> drivers/mmc/host/at91_mci.c | 2 +-
>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
>> index a6dd7da..813d208 100644
>> --- a/drivers/mmc/host/at91_mci.c
>> +++ b/drivers/mmc/host/at91_mci.c
>> @@ -315,7 +315,7 @@ static void at91_mci_post_dma_read(struct at91mci_host *host)
>> }
>>
>> kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ);
>> - dmac_flush_range((void *)sgbuffer, ((void *)sgbuffer) + amount);
>> + flush_kernel_dcache_page(sg_page(sg));
>> data->bytes_xfered += amount;
>> if (size == 0)
>> break;
>
> The flush_kernel_dcache_page() documentation specifically says that
> thou shalt run flush_kernel_dcache_page() _prior_ to kunmapping the
> page.
>
> I don't know if that makes a difference in the real world, but heck why
> not:
>
> --- a/drivers/mmc/host/at91_mci.c~mmc-at91_mci-modify-cache-flush-routines-fix
> +++ a/drivers/mmc/host/at91_mci.c
> @@ -314,8 +314,8 @@ static void at91_mci_post_dma_read(struc
> dmabuf = (unsigned *)tmpv;
> }
>
> - kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ);
> flush_kernel_dcache_page(sg_page(sg));
> + kunmap_atomic(sgbuffer, KM_BIO_SRC_IRQ);
> data->bytes_xfered += amount;
> if (size == 0)
> break;
> _

Andrew, thanks a lot for folding this in my patch.
I had no access to my emails last days and it was good to learn that
this patch went to 2.6.34-final.

Best regards,
--
Nicolas Ferre



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