Hi,
On 07/14/2014 06:34 PM, Yunpeng Gao wrote:
> If eMMC Cache feature enabled, we'd better flush
> eMMC cache in the shutdown callback. Otherwise
> data corruption issue may be observed.
I knew mmc_flush_cache() is called into mmc_shutdown() (driver/mmc/core/mmc.c)
Which data corruption is occurred? Could you explain more?
Best Regards,
Jaehoon Chung
>
> Signed-off-by: Yunpeng Gao <yunpeng.gao@xxxxxxxxx>
> ---
> drivers/mmc/card/block.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index 452782b..8a4010e 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -2509,6 +2509,10 @@ static int _mmc_blk_suspend(struct mmc_card *card)
> static void mmc_blk_shutdown(struct mmc_card *card)
> {
> _mmc_blk_suspend(card);
> +
> + mmc_claim_host(card->host);
> + mmc_flush_cache(card);
> + mmc_release_host(card->host);
> }
>
> #ifdef CONFIG_PM
>
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