[2.4.19] EFS CDROM IDE-SCSI bug

[Malcolm Mallardi]

	I am attempting to mount an EFS filesystem on a CD-ROM in
/dev/cdrom, aka /dev/scd0 (when under IDE-SCSI emulation) aka /dev/hdc
when just under the normal IDE-CD driver.  When I mount the CD under
normal IDE circumstances, it works just fine.  When I try it when the
CD is SCSI emulated, mount segfaults, and a kernel BUG gets spit into
my kernel logs:

EFS: 1.0a - http://aeschi.ch.eu.org/efs/
kernel BUG at buffer.c:2497!
invalid operand: 0000
CPU:    0
EIP:    0010:[<c0135e12>]    Not tainted
EFLAGS: 00010206
eax: 000007ff   ebx: 0000000b   ecx: 00000800   edx: c7c814a0
esi: 00000000   edi: 00000b00   ebp: 00000000   esp: c39b9e44
ds: 0018   es: 0018   ss: 0018
Process mount (pid: 17570, stackpage=c39b9000)
Stack: 00000b00 00000200 00000000 00000000 00001000 c01340a7 00000b00 00000000 
       00000200 c0222614 c4763a00 c4763acc c0134294 00000b00 00000000 00000200 
       00000000 c8a35219 00000b00 00000000 00000200 c0222614 c4763a00 c405c220 
Call Trace:    [<c01340a7>] [<c0134294>] [<c8a35219>] [<c0136fe0>] [<c8a36900>]
  [<c8a36900>] [<c01457b6>] [<c013719b>] [<c8a36900>] [<c0146699>] [<c0146962>]
  [<c01467b4>] [<c0146ce4>] [<c010856f>]

Code: 0f 0b c1 09 00 c6 1f c0 8b 44 24 20 05 00 fe ff ff 3d 00 0e 

I would wash that through ksymoops, but I can't get it to compile due
to a linking error.  Right now, I don't know if this is an issue with
the EFS filesystem driver, or with IDE-SCSI, but either/or. :)
--
Malcolm D. Mallardi - Dark Freak At Large
"Captain, we are receiving two-hundred eighty-five THOUSAND hails."
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