linux-kernel - [PATCH 1/3] [libata/BF54x]: decrease count first.

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Message-Id: <1209094676-20360-2-git-send-email-cooloney@kernel.org>
Date:	Fri, 25 Apr 2008 11:37:54 +0800
From:	Bryan Wu <cooloney@...nel.org>
To:	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Roel Kluin <12o3l@...cali.nl>, Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 1/3] [libata/BF54x]: decrease count first.

From: Roel Kluin <12o3l@...cali.nl>

When count reaches 0 the postfix decrement still subtracts (to -1), so
bfin_reset_controller() returns as if the busy flag was cleared while it was not.

Signed-off-by: Roel Kluin <12o3l@...cali.nl>
Acked-by: Sonic Zhang <sonic.zhang@...log.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
 drivers/ata/pata_bf54x.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/ata/pata_bf54x.c b/drivers/ata/pata_bf54x.c
index 0a5ad98..f334ba5 100644
--- a/drivers/ata/pata_bf54x.c
+++ b/drivers/ata/pata_bf54x.c
@@ -1417,7 +1417,7 @@ static int bfin_reset_controller(struct ata_host *host)
 	count = 10000000;
 	do {
 		status = read_atapi_register(base, ATA_REG_STATUS);
-	} while (count-- && (status & ATA_BUSY));
+	} while (--count && (status & ATA_BUSY));
 
 	/* Enable only ATAPI Device interrupt */
 	ATAPI_SET_INT_MASK(base, 1);
-- 
1.5.5
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