From: Harvey Harrison <harvey.harrison@gmail.com>
To: Jeff Garzik <jeff@garzik.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-ide <linux-ide@vger.kernel.org>
Subject: [PATCH-mm 2/2] ata: replace byteshifting with unaligned endian helpers
Date: Wed, 03 Dec 2008 10:13:40 -0800 [thread overview]
Message-ID: <1228328020.5412.24.camel@brick> (raw)
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
---
Depends on the unaligned access work in -mm.
drivers/ata/libata-scsi.c | 50 ++++++--------------------------------------
1 files changed, 7 insertions(+), 43 deletions(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index d763b2b..1c16b63 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -46,6 +46,7 @@
#include <linux/libata.h>
#include <linux/hdreg.h>
#include <linux/uaccess.h>
+#include <asm/unaligned.h>
#include "libata.h"
@@ -1384,19 +1385,10 @@ static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
*/
static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
{
- u64 lba = 0;
- u32 len;
-
VPRINTK("six-byte command\n");
- lba |= ((u64)(cdb[1] & 0x1f)) << 16;
- lba |= ((u64)cdb[2]) << 8;
- lba |= ((u64)cdb[3]);
-
- len = cdb[4];
-
- *plba = lba;
- *plen = len;
+ *plba = load_be32_noalign((__be32 *)&cdb[0]) & 0x1fffff;
+ *plen = cdb[4];
}
/**
@@ -1411,21 +1403,10 @@ static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
*/
static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
{
- u64 lba = 0;
- u32 len = 0;
-
VPRINTK("ten-byte command\n");
- lba |= ((u64)cdb[2]) << 24;
- lba |= ((u64)cdb[3]) << 16;
- lba |= ((u64)cdb[4]) << 8;
- lba |= ((u64)cdb[5]);
-
- len |= ((u32)cdb[7]) << 8;
- len |= ((u32)cdb[8]);
-
- *plba = lba;
- *plen = len;
+ *plba = load_be32_noalign((__be32 *)&cdb[2]);
+ *plen = load_be16_noalign((__be16 *)&cdb[7]);
}
/**
@@ -1440,27 +1421,10 @@ static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
*/
static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
{
- u64 lba = 0;
- u32 len = 0;
-
VPRINTK("sixteen-byte command\n");
- lba |= ((u64)cdb[2]) << 56;
- lba |= ((u64)cdb[3]) << 48;
- lba |= ((u64)cdb[4]) << 40;
- lba |= ((u64)cdb[5]) << 32;
- lba |= ((u64)cdb[6]) << 24;
- lba |= ((u64)cdb[7]) << 16;
- lba |= ((u64)cdb[8]) << 8;
- lba |= ((u64)cdb[9]);
-
- len |= ((u32)cdb[10]) << 24;
- len |= ((u32)cdb[11]) << 16;
- len |= ((u32)cdb[12]) << 8;
- len |= ((u32)cdb[13]);
-
- *plba = lba;
- *plen = len;
+ *plba = load_be64_noalign((__be64 *)&cdb[2]);
+ *plen = load_be32_noalign((__be32 *)&cdb[10]);
}
/**
--
1.6.1.rc1.262.gb6810
reply other threads:[~2008-12-03 18:13 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1228328020.5412.24.camel@brick \
--to=harvey.harrison@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=jeff@garzik.org \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.