[Bug 152885] Re: USB unknown partition table

[TJ]

Looking at the changes between v2.6.21 and v2.6.27 I see this. It may
explain why v2.6.21 works and Intrepid (v2.6.27) doesn't:

git log --pretty=format:"%h %ci %s" v2.6.21..v2.6.27 -- fs/partitions/msdos.c
0607fd0 2008-04-28 08:58:47 -0700 fat: detect media without partition table correctly
b84d879 2007-07-30 00:27:28 -0700 [PARTITION] MSDOS: Fix Sun num_partitions handling.

Of which 0607fd0 looks to have some involvement in this area, albeit to
detect non-partitioned FAT-formatted devices:

commit 0607fd02587a6b4b086dc746d63123c1f284db68
Author: Frank Seidel <fseidel at suse.de>
Date:   Mon Apr 28 02:16:31 2008 -0700

    fat: detect media without partition table correctly
    
    I received a complaint that some FAT formated medias (e.g.  sd memory cards)
    trigger a "unknown partition table" message even though there is no partition
    table and they work correctly, while in general (when e.g.  formated with
    mkdosfs or even Windows Vista) this message is not shown.
    
    Currently this seems only to happen when the medias get formatted with Windows
    XP (and possibly Win 2000).  Then the boot indicator byte contains garbage
    (part of text message) and so do the other parts checked by msdos_paritition
    which then later triggers this message.
    
    References: novell bug #364365
    
    Most fat formatted media without partition table contains zeros in the boot
    indication and the other tested bytes and so falls through the checks in
    msdos_partition, leading it to return with 1 (all is fine).
    
    But some (e.g.  WinXP formatted) fat fomated medias don't use boot_ind and so
    the check fails and causes a "unkown partition table" warning eventhough there
    is none and everything would be fine.
    
    This additional check directly verifies if there is a fat formatted medium
    without a partition table.
    
    Signed-off-by: Frank Seidel <fseidel at suse.de>
    Cc: Andreas Dilger <adilger at sun.com>
    Acked-by: OGAWA Hirofumi <hirofumi at mail.parknet.co.jp>
    Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>

-- 
USB unknown partition table
https://bugs.launchpad.net/bugs/152885
You received this bug notification because you are a member of Kernel
Bugs, which is subscribed to Linux.