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Date: Thu, 15 May 2008 17:33:05 -0700
From: Harvey Harrison <harvey.harrison@...il.com>
To: Alan Stern <stern@...land.harvard.edu>
Cc: Bryan Wu <cooloney@...nel.org>, Jie Zhang <jie.zhang@...log.com>,
Oliver Neukum <oliver@...kum.org>, david-b@...bell.net,
greg@...ah.com, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] usb: file-storage.c use unaligned access helpers
Replace the put_be16/32 and get_be16/32 helpers with the
common unaligned access routines. Note that these put_ helpers
had the pointer/value parameter in the opposite order from the
common version.
Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
drivers/usb/gadget/file_storage.c | 79 ++++++++++++-------------------------
1 files changed, 25 insertions(+), 54 deletions(-)
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index 47bb9f0..9405961 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -242,6 +242,8 @@
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
+#include <asm/unaligned.h>
+
#include "gadget_chips.h"
@@ -763,37 +765,6 @@ static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
return usb_ep_set_halt(ep);
}
-
-/*-------------------------------------------------------------------------*/
-
-/* Routines for unaligned data access */
-
-static u16 get_be16(u8 *buf)
-{
- return ((u16) buf[0] << 8) | ((u16) buf[1]);
-}
-
-static u32 get_be32(u8 *buf)
-{
- return ((u32) buf[0] << 24) | ((u32) buf[1] << 16) |
- ((u32) buf[2] << 8) | ((u32) buf[3]);
-}
-
-static void put_be16(u8 *buf, u16 val)
-{
- buf[0] = val >> 8;
- buf[1] = val;
-}
-
-static void put_be32(u8 *buf, u32 val)
-{
- buf[0] = val >> 24;
- buf[1] = val >> 16;
- buf[2] = val >> 8;
- buf[3] = val & 0xff;
-}
-
-
/*-------------------------------------------------------------------------*/
/*
@@ -1551,9 +1522,9 @@ static int do_read(struct fsg_dev *fsg)
/* Get the starting Logical Block Address and check that it's
* not too big */
if (fsg->cmnd[0] == SC_READ_6)
- lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
+ lba = get_unaligned_be32(fsg->cmnd) & 0x00ffffff;
else {
- lba = get_be32(&fsg->cmnd[2]);
+ lba = get_unaligned_be32(&fsg->cmnd[2]);
/* We allow DPO (Disable Page Out = don't save data in the
* cache) and FUA (Force Unit Access = don't read from the
@@ -1684,9 +1655,9 @@ static int do_write(struct fsg_dev *fsg)
/* Get the starting Logical Block Address and check that it's
* not too big */
if (fsg->cmnd[0] == SC_WRITE_6)
- lba = (fsg->cmnd[1] << 16) | get_be16(&fsg->cmnd[2]);
+ lba = get_unaligned_be32(fsg->cmnd) & 0x00ffffff;
else {
- lba = get_be32(&fsg->cmnd[2]);
+ lba = get_unaligned_be32(&fsg->cmnd[2]);
/* We allow DPO (Disable Page Out = don't save data in the
* cache) and FUA (Force Unit Access = write directly to the
@@ -1920,7 +1891,7 @@ static int do_verify(struct fsg_dev *fsg)
/* Get the starting Logical Block Address and check that it's
* not too big */
- lba = get_be32(&fsg->cmnd[2]);
+ lba = get_unaligned_be32(&fsg->cmnd[2]);
if (lba >= curlun->num_sectors) {
curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
return -EINVAL;
@@ -1933,7 +1904,7 @@ static int do_verify(struct fsg_dev *fsg)
return -EINVAL;
}
- verification_length = get_be16(&fsg->cmnd[7]);
+ verification_length = get_unaligned_be16(&fsg->cmnd[7]);
if (unlikely(verification_length == 0))
return -EIO; // No default reply
@@ -2078,7 +2049,7 @@ static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
memset(buf, 0, 18);
buf[0] = valid | 0x70; // Valid, current error
buf[2] = SK(sd);
- put_be32(&buf[3], sdinfo); // Sense information
+ put_unaligned_be32(sdinfo, &buf[3]); // Sense information
buf[7] = 18 - 8; // Additional sense length
buf[12] = ASC(sd);
buf[13] = ASCQ(sd);
@@ -2089,7 +2060,7 @@ static int do_request_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
{
struct lun *curlun = fsg->curlun;
- u32 lba = get_be32(&fsg->cmnd[2]);
+ u32 lba = get_unaligned_be32(&fsg->cmnd[2]);
int pmi = fsg->cmnd[8];
u8 *buf = (u8 *) bh->buf;
@@ -2099,8 +2070,8 @@ static int do_read_capacity(struct fsg_dev *fsg, struct fsg_buffhd *bh)
return -EINVAL;
}
- put_be32(&buf[0], curlun->num_sectors - 1); // Max logical block
- put_be32(&buf[4], 512); // Block length
+ put_unaligned_be32(curlun->num_sectors - 1, &buf[0]); // Max logical block
+ put_unaligned_be32(512, &buf[4]); // Block length
return 8;
}
@@ -2158,10 +2129,10 @@ static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
buf[2] = 0x04; // Write cache enable,
// Read cache not disabled
// No cache retention priorities
- put_be16(&buf[4], 0xffff); // Don't disable prefetch
+ put_unaligned_be16(0xffff, &buf[4]); // Don't disable prefetch
// Minimum prefetch = 0
- put_be16(&buf[8], 0xffff); // Maximum prefetch
- put_be16(&buf[10], 0xffff); // Maximum prefetch ceiling
+ put_unaligned_be16(0xffff, &buf[8]); // Maximum prefetch
+ put_unaligned_be16(0xffff, &buf[10]); // Maximum prefetch ceiling
}
buf += 12;
}
@@ -2178,7 +2149,7 @@ static int do_mode_sense(struct fsg_dev *fsg, struct fsg_buffhd *bh)
if (mscmnd == SC_MODE_SENSE_6)
buf0[0] = len - 1;
else
- put_be16(buf0, len - 2);
+ put_unaligned_be16(len - 2, buf0);
return len;
}
@@ -2266,8 +2237,8 @@ static int do_read_format_capacities(struct fsg_dev *fsg,
buf[3] = 8; // Only the Current/Maximum Capacity Descriptor
buf += 4;
- put_be32(&buf[0], curlun->num_sectors); // Number of blocks
- put_be32(&buf[4], 512); // Block length
+ put_unaligned_be32(curlun->num_sectors, &buf[0]); // Number of blocks
+ put_unaligned_be32(512, &buf[4]); // Block length
buf[4] = 0x02; // Current capacity
return 12;
}
@@ -2775,7 +2746,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
break;
case SC_MODE_SELECT_10:
- fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+ fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
(1<<1) | (3<<7), 0,
"MODE SELECT(10)")) == 0)
@@ -2791,7 +2762,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
break;
case SC_MODE_SENSE_10:
- fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+ fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
(1<<1) | (1<<2) | (3<<7), 0,
"MODE SENSE(10)")) == 0)
@@ -2816,7 +2787,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
break;
case SC_READ_10:
- fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
+ fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]) << 9;
if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
(1<<1) | (0xf<<2) | (3<<7), 1,
"READ(10)")) == 0)
@@ -2824,7 +2795,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
break;
case SC_READ_12:
- fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
+ fsg->data_size_from_cmnd = get_unaligned_be32(&fsg->cmnd[6]) << 9;
if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
(1<<1) | (0xf<<2) | (0xf<<6), 1,
"READ(12)")) == 0)
@@ -2840,7 +2811,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
break;
case SC_READ_FORMAT_CAPACITIES:
- fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]);
+ fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]);
if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
(3<<7), 1,
"READ FORMAT CAPACITIES")) == 0)
@@ -2898,7 +2869,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
break;
case SC_WRITE_10:
- fsg->data_size_from_cmnd = get_be16(&fsg->cmnd[7]) << 9;
+ fsg->data_size_from_cmnd = get_unaligned_be16(&fsg->cmnd[7]) << 9;
if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
(1<<1) | (0xf<<2) | (3<<7), 1,
"WRITE(10)")) == 0)
@@ -2906,7 +2877,7 @@ static int do_scsi_command(struct fsg_dev *fsg)
break;
case SC_WRITE_12:
- fsg->data_size_from_cmnd = get_be32(&fsg->cmnd[6]) << 9;
+ fsg->data_size_from_cmnd = get_unaligned_be32(&fsg->cmnd[6]) << 9;
if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
(1<<1) | (0xf<<2) | (0xf<<6), 1,
"WRITE(12)")) == 0)
--
1.5.5.1.482.g0f174
--
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