From: Kronos <kronos@kronoz.cjb.net>
cdrom_read_toc (ide-cd.c) always reads the TOC using MSF format. If the
last session of the disk starts beyond block 1152000 (LBA) there's an
overflow in the MSF format and kernel complains:
Unable to identify CD-ROM format.
I reported this bug a while ago (see bug #1930 on bugzilla) and Andy
Polyakov tracked it down.
I tried fixing it by myself setting msf_flag (cdrom_read_tocentry) to 0 and
removing the MSF to LBA conversions in cdrom_read_toc. It works but I
don't have a complete understanding of the code in ide-cd...
This is the quick & dirty patch (against 2.6.9, apply with offset to
2.6.10-rc3):
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/drivers/ide/ide-cd.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)
diff -puN drivers/ide/ide-cd.c~ide-cd-unable-to-read-multisession-dvds drivers/ide/ide-cd.c
--- 25/drivers/ide/ide-cd.c~ide-cd-unable-to-read-multisession-dvds 2004-12-11 22:14:16.629388296 -0800
+++ 25-akpm/drivers/ide/ide-cd.c 2004-12-11 22:14:16.635387384 -0800
@@ -2353,7 +2353,7 @@ static int cdrom_read_toc(ide_drive_t *d
/* Read the multisession information. */
if (toc->hdr.first_track != CDROM_LEADOUT) {
/* Read the multisession information. */
- stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
+ stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
sizeof(ms_tmp), sense);
if (stat) return stat;
} else {
@@ -2368,9 +2368,11 @@ static int cdrom_read_toc(ide_drive_t *d
msf_from_bcd (&ms_tmp.ent.addr.msf);
#endif /* not STANDARD_ATAPI */
- toc->last_session_lba = msf_to_lba (ms_tmp.ent.addr.msf.minute,
- ms_tmp.ent.addr.msf.second,
- ms_tmp.ent.addr.msf.frame);
+ toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
+ printk("ide-cd: last_session_lba: %d\n", toc->last_session_lba);
+// toc->last_session_lba = msf_to_lba (ms_tmp.ent.addr.msf.minute,
+// ms_tmp.ent.addr.msf.second,
+// ms_tmp.ent.addr.msf.frame);
toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
_