[PATCH v2] mmc: meson: Fix usage of meson_mmc_post_req()
Ulf Hansson
ulf.hansson at linaro.org
Mon Feb 28 09:05:35 PST 2022
+ Hainer
On Wed, 16 Feb 2022 at 13:42, Rong Chen <rong.chen at amlogic.com> wrote:
>
> Currently meson_mmc_post_req() is called in meson_mmc_request() right
> after meson_mmc_start_cmd(). This could lead to DMA unmapping before the request
> is actually finished.
>
> To fix, don't call meson_mmc_post_req() until meson_mmc_request_done().
>
> Signed-off-by: Rong Chen <rong.chen at amlogic.com>
We should probably add a fixes tag to this, right?
Fixes: 79ed05e329c3 ("mmc: meson-gx: add support for descriptor chain mode")
Moreover, you want this tagged for stable kernels too, right?
I have applied it for fixes and added the above tags, please tell if
you want me to change it.
Kind regards
Uffe
> ---
> drivers/mmc/host/meson-gx-mmc.c | 15 ++++++++-------
> 1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index 8f36536cb1b6..58ab9d90bc8b 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -173,6 +173,8 @@ struct meson_host {
> int irq;
>
> bool vqmmc_enabled;
> + bool needs_pre_post_req;
> +
> };
>
> #define CMD_CFG_LENGTH_MASK GENMASK(8, 0)
> @@ -663,6 +665,8 @@ static void meson_mmc_request_done(struct mmc_host *mmc,
> struct meson_host *host = mmc_priv(mmc);
>
> host->cmd = NULL;
> + if (host->needs_pre_post_req)
> + meson_mmc_post_req(mmc, mrq, 0);
> mmc_request_done(host->mmc, mrq);
> }
>
> @@ -880,7 +884,7 @@ static int meson_mmc_validate_dram_access(struct mmc_host *mmc, struct mmc_data
> static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
> {
> struct meson_host *host = mmc_priv(mmc);
> - bool needs_pre_post_req = mrq->data &&
> + host->needs_pre_post_req = mrq->data &&
> !(mrq->data->host_cookie & SD_EMMC_PRE_REQ_DONE);
>
> /*
> @@ -896,22 +900,19 @@ static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
> }
> }
>
> - if (needs_pre_post_req) {
> + if (host->needs_pre_post_req) {
> meson_mmc_get_transfer_mode(mmc, mrq);
> if (!meson_mmc_desc_chain_mode(mrq->data))
> - needs_pre_post_req = false;
> + host->needs_pre_post_req = false;
> }
>
> - if (needs_pre_post_req)
> + if (host->needs_pre_post_req)
> meson_mmc_pre_req(mmc, mrq);
>
> /* Stop execution */
> writel(0, host->regs + SD_EMMC_START);
>
> meson_mmc_start_cmd(mmc, mrq->sbc ?: mrq->cmd);
> -
> - if (needs_pre_post_req)
> - meson_mmc_post_req(mmc, mrq, 0);
> }
>
> static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
> --
> 2.25.1
>
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