From: Jianxin Pan <jianxin.pan@amlogic.com>
To: Ulf Hansson <ulf.hansson@linaro.org>,
Kevin Hilman <khilman@baylibre.com>
Cc: Victor Wan <victor.wan@amlogic.com>,
Jianxin Pan <jianxin.pan@amlogic.com>,
Neil Armstrong <narmstrong@baylibre.com>,
linux-mmc@vger.kernel.org, Nan Li <nan.li@amlogic.com>,
linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org,
Jerome Brunet <jbrunet@baylibre.com>
Subject: [PATCH] mmc: fix mmc dma operation
Date: Mon, 21 Oct 2019 13:59:01 +0800 [thread overview]
Message-ID: <1571637541-119016-1-git-send-email-jianxin.pan@amlogic.com> (raw)
From: Nan Li <nan.li@amlogic.com>
In MMC dma transfer, the region requested by dma_map_sg() may be released
by dma_unmap_sg() before the transfer is completed.
Put the unmap operation in front of mmc_request_done() to avoid this.
Signed-off-by: Nan Li <nan.li@amlogic.com>
Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com>
---
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 e712315..7667e8a 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -173,6 +173,7 @@ struct meson_host {
int irq;
bool vqmmc_enabled;
+ bool needs_pre_post_req;
};
#define CMD_CFG_LENGTH_MASK GENMASK(8, 0)
@@ -654,6 +655,8 @@ 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);
}
@@ -803,25 +806,23 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
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);
- 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)
--
2.7.4
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next reply other threads:[~2019-10-21 5:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-21 5:59 Jianxin Pan [this message]
2019-10-21 7:57 ` Neil Armstrong
2019-10-21 8:23 ` Jianxin Pan
2019-10-21 9:17 ` Jerome Brunet
2019-10-21 14:48 ` Ulf Hansson
2019-10-21 15:36 ` Jerome Brunet
2019-10-22 2:45 ` Nan Li
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