kern/138789: [cam] [patch] cd(4) patch for drives/discs failing the 'read toc' command

[jmg at FreeBSD.org]

Synopsis: [cam] [patch] cd(4) patch for drives/discs failing the 'read toc' command

State-Changed-From-To: open->analyzed
State-Changed-By: jmg
State-Changed-When: Sat Feb 20 02:26:32 UTC 2010
State-Changed-Why: 
I will take over this PR...  The problem is that the scsi-cd.c driver
attempts to read the LEADOUT track of the disc, and if it can't, assumes
the disc is not valid..  For some Blu-Ray drives, they, per the spec, do
not allow reading of the LEADOUT track...  I also have a drive that fails..

I am currently working on a patch to not read the LEADOUT track, but
keep the original behavior as a sysctl incase it breaks older cd-rom
drives.


Responsible-Changed-From-To: freebsd-scsi->jmg
Responsible-Changed-By: jmg
Responsible-Changed-When: Sat Feb 20 02:26:32 UTC 2010
Responsible-Changed-Why: 
I will take over this PR...  The problem is that the scsi-cd.c driver
attempts to read the LEADOUT track of the disc, and if it can't, assumes
the disc is not valid..  For some Blu-Ray drives, they, per the spec, do
not allow reading of the LEADOUT track...  I also have a drive that fails..

I am currently working on a patch to not read the LEADOUT track, but
keep the original behavior as a sysctl incase it breaks older cd-rom
drives.

http://www.freebsd.org/cgi/query-pr.cgi?pr=138789