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Subject[PATCH 1/3] mmc: core: Avoid hogging the CPU while polling for busy in the I/O err path
Date
When mmc_blk_fix_state() sends a CMD12 to try to move the card into the
transfer state, it calls card_busy_detect() to poll for the card's state
with CMD13. This is done without any delays in between the commands being
sent.

Rather than fixing card_busy_detect() in this regards, let's instead
convert into using the common mmc_poll_for_busy(), which also helps us to
avoid open-coding.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---
drivers/mmc/core/block.c | 2 +-
drivers/mmc/core/mmc_ops.c | 4 +++-
drivers/mmc/core/mmc_ops.h | 1 +
3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 88f4c215caa6..1b5576048cdb 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1630,7 +1630,7 @@ static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)

mmc_blk_send_stop(card, timeout);

- err = card_busy_detect(card, timeout, NULL);
+ err = mmc_poll_for_busy(card, timeout, false, MMC_BUSY_IO);

mmc_retune_release(card->host);

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 973756ed4016..e2c431c0ce5d 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -435,7 +435,7 @@ static int mmc_busy_cb(void *cb_data, bool *busy)
u32 status = 0;
int err;

- if (host->ops->card_busy) {
+ if (data->busy_cmd != MMC_BUSY_IO && host->ops->card_busy) {
*busy = host->ops->card_busy(host);
return 0;
}
@@ -457,6 +457,7 @@ static int mmc_busy_cb(void *cb_data, bool *busy)
break;
case MMC_BUSY_HPI:
case MMC_BUSY_EXTR_SINGLE:
+ case MMC_BUSY_IO:
break;
default:
err = -EINVAL;
@@ -521,6 +522,7 @@ int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,

return __mmc_poll_for_busy(card, timeout_ms, &mmc_busy_cb, &cb_data);
}
+EXPORT_SYMBOL_GPL(mmc_poll_for_busy);

bool mmc_prepare_busy_cmd(struct mmc_host *host, struct mmc_command *cmd,
unsigned int timeout_ms)
diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h
index 41ab4f573a31..ae25ffc2e870 100644
--- a/drivers/mmc/core/mmc_ops.h
+++ b/drivers/mmc/core/mmc_ops.h
@@ -15,6 +15,7 @@ enum mmc_busy_cmd {
MMC_BUSY_ERASE,
MMC_BUSY_HPI,
MMC_BUSY_EXTR_SINGLE,
+ MMC_BUSY_IO,
};

struct mmc_host;
--
2.25.1
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