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We want ->tf_read() to get a complete snapshot of all taskfile
registers, without requiring the callers to manually call
ata_chk_status() and ata_chk_err() themselves.
This also fixes a minor bug in sata_vsc where the lower bits of the
feature register were incorrectly placed in the HOB (high order bits)
portion of struct ata_taskfile.
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Changes mostly from Mark Lord.
- fix bugs in probe-time error handling
- only complete qc if not NULL
- check port-level polling flags
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Enforce access rules where appropriate.
If the compiler is smart enough, this may buy us an optimization or two
as a side effect.
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from me: change from OSL+GPL to GPL (with approval)
from Mark: Gets rid of an unneeded control bit, slightly increasing
throughput.
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