USB: io_ti: fix firmware download on big-endian machines (part 2)

commit c03890ff5e24a4bf59059f2d179f427559b7330a upstream.

A recent patch that purported to fix firmware download on big-endian
machines failed to add the corresponding sparse annotation to the
i2c-header. This was reported by the kbuild test robot.

Adding the appropriate annotation revealed another endianess bug related
to the i2c-header Size-field in a code path that is exercised when the
firmware is actually being downloaded (and not just verified and left
untouched unless older than the firmware at hand).

This patch adds the required sparse annotation to the i2c-header and
makes sure that the Size-field is sent in little-endian byte order
during firmware download also on big-endian machines.

Note that this patch is only compile-tested, but that there is no
functional change for little-endian systems.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Cc: Ludovic Drolez <ldrolez@debian.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index c575e0a..438138f 100644 (file)
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -923,7 +923,7 @@ static int build_i2c_fw_hdr(__u8 *header, struct device *dev)
        firmware_rec =  (struct ti_i2c_firmware_rec*)i2c_header->Data;
 
        i2c_header->Type        = I2C_DESC_TYPE_FIRMWARE_BLANK;
-       i2c_header->Size        = (__u16)buffer_size;
+       i2c_header->Size        = cpu_to_le16(buffer_size);
        i2c_header->CheckSum    = cs;
        firmware_rec->Ver_Major = OperationalMajorVersion;
        firmware_rec->Ver_Minor = OperationalMinorVersion;

diff --git a/drivers/usb/serial/io_usbvend.h b/drivers/usb/serial/io_usbvend.h
index 51f83fb..6f6a856 100644 (file)
--- a/drivers/usb/serial/io_usbvend.h
+++ b/drivers/usb/serial/io_usbvend.h
@@ -594,7 +594,7 @@ struct edge_boot_descriptor {
 
 struct ti_i2c_desc {
        __u8    Type;                   // Type of descriptor
-       __u16   Size;                   // Size of data only not including header
+       __le16  Size;                   // Size of data only not including header
        __u8    CheckSum;               // Checksum (8 bit sum of data only)
        __u8    Data[0];                // Data starts here
 } __attribute__((packed));