On Mon, Nov 07, 2011 at 09:55:11PM +0530, Balaji T K wrote:
> From: Per Forlin <per.forlin@xxxxxxxxxx>
>
> Reported by Russell King:
> mmcblk0: error -84 transferring data, sector 149201, nr 64,
> cmd response 0x900, card status 0xb00
> mmcblk0: retrying using single block read
>
> WARNING: at lib/dma-debug.c:811 check_unmap
> omap_hsmmc omap_hsmmc.0: DMA-API: device driver tries to free DMA memory
> it has not allocated [device address=0x0000000080933000] [size=20480 bytes]
>
> In case of an error dma_unmap() is issued in omap_hsmmc_dma_cleanup()
> and then again in omap_hsmmc_post_req(). Resolve this by clearing the
> host_cookie to indicate there is no DMA mapped memory to unmap.
>
> Signed-off-by: Per Forlin <per.forlin@xxxxxxxxxx>
> Tested-by: Balaji T K <balajitk@xxxxxx>
> ---
> Repost with my Tested-by
Thanks.
Tested-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
>
> drivers/mmc/host/omap_hsmmc.c | 7 +++++--
> 1 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 101cd31..d5fe43d 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -1010,6 +1010,7 @@ static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
> host->data->sg_len,
> omap_hsmmc_get_dma_dir(host, host->data));
> omap_free_dma(dma_ch);
> + host->data->host_cookie = 0;
> }
> host->data = NULL;
> }
> @@ -1575,8 +1576,10 @@ static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
> struct mmc_data *data = mrq->data;
>
> if (host->use_dma) {
> - dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
> - omap_hsmmc_get_dma_dir(host, data));
> + if (data->host_cookie)
> + dma_unmap_sg(mmc_dev(host->mmc), data->sg,
> + data->sg_len,
> + omap_hsmmc_get_dma_dir(host, data));
> data->host_cookie = 0;
> }
> }
> --
> 1.7.0.4
>
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