Tejun Heo wrote:
Mark Lord wrote:
Tejun Heo wrote:
Mark Lord wrote:
Tejun Heo wrote:
As _GTF commands can't transfer data, device error never signals
transfer error. It indicates that the device vetoed the operation, so
it's meaningless to retry.
..
The SECURITY commands may pass a data block to the drive,
containing the password required to unlock/freeze a drive.
I suspect ACPI on many machines will issue such a command,
and it does indeed transfer data (512 bytes).
Surprise, ACPI _GTF can't do that. Don't ask me why. :-)
..
Then why are we (going to be) filtering those op's (one of your patches) ?
Filtered ones are not LOCK / FREEZE LOCK commands which prevent further
changes. e.g. SET MAX FREEZE LOCK will prevent further size changes
using SET MAX [EXT]. It's bad for three reasons 1. it locks down drive
feature without user consent (e.g. can't unlock HPA) 2. it makes
debugging difficult by putting drives into different states 3. it just
doesn't serve any good.
..
Okay-dokey. I think I mis-read which FREEZE command was in the patch.
Cheers!
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