[PATCH 5.15 081/110] mmc: meson: Fix usage of meson_mmc_post_req()

Greg Kroah-Hartman
2022-03-14T12:22:41Z

From: Rong Chen <rong.chen@amlogic.com>

commit f0d2f15362f02444c5d7ffd5a5eb03e4aa54b685 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/mmc/host/meson-gx-mmc.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)

--- 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(struc
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_acces
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
}
}

- 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)