diff mbox series

[5.14,345/432] mmc: core: Avoid hogging the CPU while polling for busy for mmc ioctls

Message ID 20210916155822.522528425@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Sept. 16, 2021, 4:01 p.m. UTC 
From: Ulf Hansson <ulf.hansson@linaro.org>


[ Upstream commit 468108155b0f89cc08189cc33f9bacfe9da8a125 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>

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

-- 
2.30.2
diff mbox series

Patch

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 170343411f53..c30d0ab15539 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -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;