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USB: io_ti: fix firmware download on big-endian machines

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During firmware download the device expects memory addresses in
big-endian byte order. As the wIndex parameter which hold the address is
sent in little-endian byte order regardless of host byte order, we need
to use swab16 rather than cpu_to_be16.

Also make sure to handle the struct ti_i2c_desc size parameter which is
returned in little-endian byte order.

Reported-by: Ludovic Drolez <ldrolez@debian.org>
Tested-by: Ludovic Drolez <ldrolez@debian.org>
Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2014-04-25 15:23:03 +02:00 committed by Greg Kroah-Hartman
parent 01bb59ebff
commit 5509076d1b
1 changed files with 33 additions and 17 deletions
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50
drivers/usb/serial/io_ti.c
View File

@ -28,6 +28,7 @@
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/serial.h>
#include <linux/swab.h>
#include <linux/kfifo.h>
#include <linux/ioctl.h>
#include <linux/firmware.h>
@ -280,7 +281,7 @@ static int read_download_mem(struct usb_device *dev, int start_address,
{
int status = 0;
__u8 read_length;
__be16 be_start_address;
u16 be_start_address;
dev_dbg(&dev->dev, "%s - @ %x for %d\n", __func__, start_address, length);
@ -296,10 +297,14 @@ static int read_download_mem(struct usb_device *dev, int start_address,
if (read_length > 1) {
dev_dbg(&dev->dev, "%s - @ %x for %d\n", __func__, start_address, read_length);
}
be_start_address = cpu_to_be16(start_address);
/*
* NOTE: Must use swab as wIndex is sent in little-endian
* byte order regardless of host byte order.
*/
be_start_address = swab16((u16)start_address);
status = ti_vread_sync(dev, UMPC_MEMORY_READ,
(__u16)address_type,
(__force __u16)be_start_address,
be_start_address,
buffer, read_length);
if (status) {
@ -394,7 +399,7 @@ static int write_i2c_mem(struct edgeport_serial *serial,
struct device *dev = &serial->serial->dev->dev;
int status = 0;
int write_length;
__be16 be_start_address;
u16 be_start_address;
/* We can only send a maximum of 1 aligned byte page at a time */
@ -409,11 +414,16 @@ static int write_i2c_mem(struct edgeport_serial *serial,
__func__, start_address, write_length);
usb_serial_debug_data(dev, __func__, write_length, buffer);
/* Write first page */
be_start_address = cpu_to_be16(start_address);
/*
* Write first page.
*
* NOTE: Must use swab as wIndex is sent in little-endian byte order
* regardless of host byte order.
*/
be_start_address = swab16((u16)start_address);
status = ti_vsend_sync(serial->serial->dev,
UMPC_MEMORY_WRITE, (__u16)address_type,
(__force __u16)be_start_address,
be_start_address,
buffer, write_length);
if (status) {
dev_dbg(dev, "%s - ERROR %d\n", __func__, status);
@ -436,11 +446,16 @@ static int write_i2c_mem(struct edgeport_serial *serial,
__func__, start_address, write_length);
usb_serial_debug_data(dev, __func__, write_length, buffer);
/* Write next page */
be_start_address = cpu_to_be16(start_address);
/*
* Write next page.
*
* NOTE: Must use swab as wIndex is sent in little-endian byte
* order regardless of host byte order.
*/
be_start_address = swab16((u16)start_address);
status = ti_vsend_sync(serial->serial->dev, UMPC_MEMORY_WRITE,
(__u16)address_type,
(__force __u16)be_start_address,
be_start_address,
buffer, write_length);
if (status) {
dev_err(dev, "%s - ERROR %d\n", __func__, status);
@ -585,8 +600,8 @@ static int get_descriptor_addr(struct edgeport_serial *serial,
if (rom_desc->Type == desc_type)
return start_address;
start_address = start_address + sizeof(struct ti_i2c_desc)
+ rom_desc->Size;
start_address = start_address + sizeof(struct ti_i2c_desc) +
le16_to_cpu(rom_desc->Size);
} while ((start_address < TI_MAX_I2C_SIZE) && rom_desc->Type);
@ -599,7 +614,7 @@ static int valid_csum(struct ti_i2c_desc *rom_desc, __u8 *buffer)
__u16 i;
__u8 cs = 0;
for (i = 0; i < rom_desc->Size; i++)
for (i = 0; i < le16_to_cpu(rom_desc->Size); i++)
cs = (__u8)(cs + buffer[i]);
if (cs != rom_desc->CheckSum) {
@ -650,7 +665,7 @@ static int check_i2c_image(struct edgeport_serial *serial)
break;
if ((start_address + sizeof(struct ti_i2c_desc) +
rom_desc->Size) > TI_MAX_I2C_SIZE) {
le16_to_cpu(rom_desc->Size)) > TI_MAX_I2C_SIZE) {
status = -ENODEV;
dev_dbg(dev, "%s - structure too big, erroring out.\n", __func__);
break;
@ -665,7 +680,8 @@ static int check_i2c_image(struct edgeport_serial *serial)
/* Read the descriptor data */
status = read_rom(serial, start_address +
sizeof(struct ti_i2c_desc),
rom_desc->Size, buffer);
le16_to_cpu(rom_desc->Size),
buffer);
if (status)
break;
@ -674,7 +690,7 @@ static int check_i2c_image(struct edgeport_serial *serial)
break;
}
start_address = start_address + sizeof(struct ti_i2c_desc) +
rom_desc->Size;
le16_to_cpu(rom_desc->Size);
} while ((rom_desc->Type != I2C_DESC_TYPE_ION) &&
(start_address < TI_MAX_I2C_SIZE));
@ -712,7 +728,7 @@ static int get_manuf_info(struct edgeport_serial *serial, __u8 *buffer)
/* Read the descriptor data */
status = read_rom(serial, start_address+sizeof(struct ti_i2c_desc),
rom_desc->Size, buffer);
le16_to_cpu(rom_desc->Size), buffer);
if (status)
goto exit;