[U-Boot] [PATCH] FAT: fix some issues in FAT write support code

[Donggeun Kim <dg77.kim@samsung.com>]

On 2011? 12? 15? 22:12, Anatolij Gustschin wrote:
> Writing a file to the FAT partition didn't work while a
> test using a CF card. The test was done on mpc5200 based
> board (powerpc). There is a number of problems in FAT
> write code:
> 
> Compiler warning:
> fat_write.c: In function 'file_fat_write':
> fat_write.c:326: warning: 'counter' may be used uninitialized
> in this function
> fat_write.c:326: note: 'counter' was declared here
> 
> 'l_filename' string is not terminated, so a file name
> with garbage at the end is used as a file name as shown
> by debug code.
> 
> Return value of set_contents() is not checked properly
> so actually a file won't be written at all (as checked
> using 'fatls' after a write attempt with 'fatwrite'
> command).
> 
> do_fat_write() doesn't return the number of written bytes
> if no error happened. However the return value of this
> function is used to show the number of written bytes
> in do_fat_fswrite().
> 
> The patch adds some debug code and fixes above mentioned
> problems and also fixes a typo in error output.
> 
> NOTE: after a successful write to the FAT partition (under
> U-Boot) the partition was checked under Linux using fsck.
> The partition needed fixing FATs:
> -bash-3.2# fsck -a /dev/sda1
> fsck 1.39 (29-May-2006)
> dosfsck 2.11, 12 Mar 2005, FAT32, LFN
> FATs differ but appear to be intact. Using first FAT.
> Performing changes.
> 
> Signed-off-by: Anatolij Gustschin <agust@denx.de>
> Cc: Donggeun Kim <dg77.kim@samsung.com>
> Cc: Aaron Williams <Aaron.Williams@cavium.com>
Acked-by: Donggeun Kim <dg77.kim@samsung.com>

Thanks.
-Donggeun