linux-kernel - [PATCH 2/3] mmc: core: Avoid hogging the CPU while polling for busy for mmc ioctls

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Message-Id: <20210702134229.357717-3-ulf.hansson@linaro.org>
Date:   Fri,  2 Jul 2021 15:42:28 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     linux-mmc@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Christian Lohle <CLoehle@...erstone.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] mmc: core: Avoid hogging the CPU while polling for busy for mmc ioctls

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@...aro.org>
---
 drivers/mmc/core/block.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 1b5576048cdb..0f9044cf3aab 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -599,7 +599,8 @@ 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;
-- 
2.25.1