Since our max_lun is unconditionally set to 1, we might as well
hardcode a LUN 0 probe, rather than a wildcard LUN scan.
The ide-scsi driver sets max_lun to a value greater than under
certain conditions:
if ((drive->id->last_lun & 0x7) != 7)
host->max_lun = (drive->id->last_lun & 0x7) + 1;
else
host->max_lun = 1;
last_lun is Word 126 of IDENTIFY PACKET DEVICE, marked as obsolete
and undocumented in non-ancient specs. We'll leave it out for now.
Should the need arise to support multi-LUN ATAPI devices, we'll
probably want to add the above code.
Finally, there have been reports of REPORT LUNS commands locking up
ATAPI drives. Eliminating the wildcard LUN scan could help reduce
the trouble from problematic drives.
Replace SCSI's legacy "bang at the door" method of probing with one
directly controlled by the underlying ATA transport layer.
We now only call scsi_scan_target() for devices we find, rather than
probing every possible channel/id within a certain range.
ATAPI is getting close to being ready. To increase exposure, we enable
the code in the upstream kernel, but default it to off (present
behavior). Users must pass atapi_enabled=1 as a module option (if
module) or on the kernel command line (if built in) to turn on
discovery of their ATAPI devices.
- changes license of all code from OSL+GPL to plain ole GPL
- except for NVIDIA, who hasn't yet responded about sata_nv
- copyright holders were already contacted privately
- adds info in each driver about where hardware/protocol docs may be
obtained
- where I have made major contributions, updated copyright dates
Fix bugs for unlikely edge cases noticed by Douglas Gilbert:
- When READ(6)/WRITE(6) sector count == 0, treat it as 256 sectors
- For other READ(x)/WRITE(x), when sector count == 0, error.
We don't support successfully completing zero-length transfers at
this time.
Jeff Garzik
Jeff Raubitschek
Albert Lee
Douglas Gilbert
Tejun Heo
Philip Pokorny
Jeff Garzik