linux-kernel - [PATCH] blackfin: bfin_reset_controller() busy flag appears cleared when it is not

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Message-ID: <47FC8F8F.5050200@tiscali.nl>
Date:	Wed, 09 Apr 2008 11:42:39 +0200
From:	Roel Kluin <12o3l@...cali.nl>
To:	sonic.zhang@...log.com
CC:	uclinux-dist-devel@...ckfin.uclinux.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] blackfin: bfin_reset_controller() busy flag appears cleared
 when it is not

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>
---
diff --git a/drivers/ata/pata_bf54x.c b/drivers/ata/pata_bf54x.c
index 7f87f10..4208c49 100644
--- a/drivers/ata/pata_bf54x.c
+++ b/drivers/ata/pata_bf54x.c
@@ -1442,15 +1442,15 @@ static int bfin_reset_controller(struct ata_host *host)
 	ATAPI_SET_CONTROL(base, ATAPI_GET_CONTROL(base) & ~DEV_RST);
 	msleep(2);
 
 	/* Wait on Busy flag to clear */
 	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);
 	SSYNC();
 
 	return (!count);
 }
--
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