linux-kernel - [PATCH 2/3] mtip32xx: Fix to make lba address correct in big-endian systems

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Message-ID: <509A5C39.40609@micron.com>
Date:	Wed, 7 Nov 2012 06:03:53 -0700
From:	Selvan Mani <smani@...ron.com>
To:	<axboe@...nel.dk>
CC:	<asamymuthupa@...ron.com>, <sbradshaw@...ron.com>,
	<linux-kernel@...r.kernel.org>, <dan.carpenter@...cle.com>
Subject: [PATCH 2/3] mtip32xx: Fix to make lba address correct in big-endian
 systems


Earlier lba address was assigned directly to lba_low and lba_low_ex,
which would result in a different number (bytes reversed) in
big-endian systems. Now assigning lba address byte-by-byte to fis.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Selvan Mani <smani@...ron.com>
Signed-off-by: Asai Thambi S P <asamymuthupa@...ron.com>
---
 drivers/block/mtip32xx/mtip32xx.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index dfb7196..df46b5a 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -2465,8 +2465,12 @@ static void mtip_hw_submit_io(struct driver_data *dd, sector_t start,
 	fis->opts        = 1 << 7;
 	fis->command     =
 		(dir == READ ? ATA_CMD_FPDMA_READ : ATA_CMD_FPDMA_WRITE);
-	*((unsigned int *) &fis->lba_low) = (start & 0xFFFFFF);
-	*((unsigned int *) &fis->lba_low_ex) = ((start >> 24) & 0xFFFFFF);
+	fis->lba_low     = start & 0xFF;
+	fis->lba_mid     = (start >> 8) & 0xFF;
+	fis->lba_hi      = (start >> 16) & 0xFF;
+	fis->lba_low_ex  = (start >> 24) & 0xFF;
+	fis->lba_mid_ex  = (start >> 32) & 0xFF;
+	fis->lba_hi_ex   = (start >> 40) & 0xFF;
 	fis->device	 = 1 << 6;
 	fis->features    = nsect & 0xFF;
 	fis->features_ex = (nsect >> 8) & 0xFF;
-- 
1.7.1
--
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