linux-kernel - [PATCH 02/13] mmc: dw_mmc: fix the debug message for checking card's present

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Date:   Thu, 03 Nov 2016 15:21:24 +0900
From:   Jaehoon Chung <jh80.chung@...sung.com>
To:     linux-mmc@...r.kernel.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, ulf.hansson@...aro.org,
        robh+dt@...nel.org, krzk@...nel.org, heiko@...ech.de,
        shawn.lin@...k-chips.com, Jaehoon Chung <jh80.chung@...sung.com>
Subject: [PATCH 02/13] mmc: dw_mmc: fix the debug message for checking card's
 present

If display the debug message, this message should be spamming.
If flags is maintained the previous value, didn't display the debug
message.

Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
---
 drivers/mmc/host/dw_mmc.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index b87dd07..1e71fd4 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1537,13 +1537,10 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
 			== 0 ? 1 : 0;
 
 	spin_lock_bh(&host->lock);
-	if (present) {
-		set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
+	if (present && !test_and_set_bit(DW_MMC_CARD_PRESENT, &slot->flags))
 		dev_dbg(&mmc->class_dev, "card is present\n");
-	} else {
-		clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
+	else if (!test_and_clear_bit(DW_MMC_CARD_PRESENT, &slot->flags))
 		dev_dbg(&mmc->class_dev, "card is not present\n");
-	}
 	spin_unlock_bh(&host->lock);
 
 	return present;
-- 
2.10.1