On 13 February 2015 at 06:55, keita kobayashi
<keita.kobayashi.ym@xxxxxxxxxxx> wrote:
> Current PIO mode occurred kernel panic with CONFIG_HIGHMEM.
> This patch fixes the kernel panic by converting the driver
> to the sg_miter API.
>
> Reported-by: Cao Minh Hiep <cm-hiep@xxxxxxxxxxx>
> Signed-off-by: Keita Kobayashi <keita.kobayashi.ym@xxxxxxxxxxx>
Applied, thanks!
Kind regards
Uffe
> ---
> This patch is based on renesas.git / renesas-devel-20150211-v3.19 tag.
>
> drivers/mmc/host/tmio_mmc.h | 1 +
> drivers/mmc/host/tmio_mmc_pio.c | 35 ++++++++++++++++-------------------
> 2 files changed, 17 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
> index a34ecbe..3092219 100644
> --- a/drivers/mmc/host/tmio_mmc.h
> +++ b/drivers/mmc/host/tmio_mmc.h
> @@ -56,6 +56,7 @@ struct tmio_mmc_host {
> struct scatterlist *sg_orig;
> unsigned int sg_len;
> unsigned int sg_off;
> + struct sg_mapping_iter sg_miter;
>
> struct platform_device *pdev;
> struct tmio_mmc_data *pdata;
> diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
> index 250bf8c..6d8f363 100644
> --- a/drivers/mmc/host/tmio_mmc_pio.c
> +++ b/drivers/mmc/host/tmio_mmc_pio.c
> @@ -70,17 +70,14 @@ static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
>
> static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
> {
> - host->sg_len = data->sg_len;
> - host->sg_ptr = data->sg;
> - host->sg_orig = data->sg;
> - host->sg_off = 0;
> -}
> + unsigned int flags = SG_MITER_ATOMIC;
>
> -static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
> -{
> - host->sg_ptr = sg_next(host->sg_ptr);
> - host->sg_off = 0;
> - return --host->sg_len;
> + if (data->flags & MMC_DATA_READ)
> + flags |= SG_MITER_TO_SG;
> + else
> + flags |= SG_MITER_FROM_SG;
> +
> + sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
> }
>
> #ifdef CONFIG_MMC_DEBUG
> @@ -418,7 +415,7 @@ static void tmio_mmc_transfer_data(struct tmio_mmc_host *host,
> static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
> {
> struct mmc_data *data = host->data;
> - void *sg_virt;
> + struct sg_mapping_iter *sg_miter = &host->sg_miter;
> unsigned short *buf;
> unsigned int count;
> unsigned long flags;
> @@ -431,10 +428,12 @@ static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
> return;
> }
>
> - sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
> - buf = (unsigned short *)(sg_virt + host->sg_off);
> + local_irq_save(flags);
>
> - count = host->sg_ptr->length - host->sg_off;
> + if (!sg_miter_next(sg_miter))
> + return;
> + buf = sg_miter->addr;
> + count = sg_miter->length;
> if (count > data->blksz)
> count = data->blksz;
>
> @@ -444,12 +443,10 @@ static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
> /* Transfer the data */
> tmio_mmc_transfer_data(host, buf, count);
>
> - host->sg_off += count;
> -
> - tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
> + sg_miter->consumed = count;
> + sg_miter_stop(sg_miter);
>
> - if (host->sg_off == host->sg_ptr->length)
> - tmio_mmc_next_sg(host);
> + local_irq_restore(flags);
>
> return;
> }
> --
> 1.7.9.5
> --
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