The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f0d2f15362f02444c5d7ffd5a5eb03e4aa54b685 Mon Sep 17 00:00:00 2001 From: Rong Chen rong.chen@amlogic.com Date: Wed, 16 Feb 2022 20:42:39 +0800 Subject: [PATCH] mmc: meson: Fix usage of meson_mmc_post_req()

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@amlogic.com Reviewed-by: Kevin Hilman khilman@baylibre.com Fixes: 79ed05e329c3 ("mmc: meson-gx: add support for descriptor chain mode") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20220216124239.4007667-1-rong.chen@amlogic.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org

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)