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mmc: core: Avoid hogging the CPU while polling for busy for mmc ioctls

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When __mmc_blk_ioctl_cmd() calls card_busy_detect() to verify that the
card's states moves back into transfer state, the polling with CMD13 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>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Link: https://lore.kernel.org/r/20210702134229.357717-3-ulf.hansson@linaro.org
This commit is contained in:
Ulf Hansson 2021-07-02 15:42:28 +02:00
parent 972d508483
commit 468108155b
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/core/block.c
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@ -605,7 +605,8 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
* Ensure RPMB/R1B command has completed by polling CMD13
* "Send Status".
*/
err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, NULL);
err = mmc_poll_for_busy(card, MMC_BLK_TIMEOUT_MS, false,
MMC_BUSY_IO);
}
return err;