2.5.47-xfs loop device problem

[Michael]

The patch fixed the oops I got previously.
But I still get this error :

spam michael # mount -o loop stuff/linux-cd/knoppix/orig/KNOPPIX_V3.1-08-11-2002-EN.iso /mnt/iso
/dev/loop0: Input/output error
mount: you must specify the filesystem type

dmesg output :
Buffer I/O error on device loop(7,0), logical block 0
Buffer I/O error on device loop(7,0), logical block 1
Buffer I/O error on device loop(7,0), logical block 2
Buffer I/O error on device loop(7,0), logical block 3
Buffer I/O error on device loop(7,0), logical block 4
Buffer I/O error on device loop(7,0), logical block 5
Buffer I/O error on device loop(7,0), logical block 6
Buffer I/O error on device loop(7,0), logical block 7
Buffer I/O error on device loop(7,0), logical block 8
Buffer I/O error on device loop(7,0), logical block 9
Buffer I/O error on device loop(7,0), logical block 10
Buffer I/O error on device loop(7,0), logical block 11
Buffer I/O error on device loop(7,0), logical block 12
Buffer I/O error on device loop(7,0), logical block 13
Buffer I/O error on device loop(7,0), logical block 14
Buffer I/O error on device loop(7,0), logical block 15
Buffer I/O error on device loop(7,0), logical block 0

Thanks.