[PATCH 0/3] ata: libata-scsi: fix ATA PASS-THROUGH(32) handling

[shao.mingyin]

ATA PASS-THROUGH(32) uses the variable length CDB opcode 7Fh with
service action 1FF0h.  Commit b1ffbf854e08 added support for it, but
three paths still use the offsets of the 12- and 16-byte CDBs, or do
not recognize the 32-byte form at all.

Patch 1 fixes the PIO multi-sector sanity check and the multi_count
computation, which read cdb[1] instead of cdb[1 + cdb_offset], and
reports the field pointer for the same byte.

Patch 2 makes an unsupported service action fail with INVALID FIELD IN
CDB.  It currently returns 1 without setting sense data, so the command
completes with SAM_STAT_GOOD even though no ATA command was issued.

Patch 3 teaches the completion path to recognize ATA PASS-THROUGH(32)
and to read CK_COND from byte 11.  Without it, CK_COND is ignored and
the ATA Status Return sense descriptor is not built.

The three patches are independent and can be applied in any order.  All
were tested with a 32-byte CDB sent through SG_IO to a QEMU IDE disk;
the per-patch test descriptions are included after the --- line.

Signed-off-by: Shao Mingyin <shao.mingyin@xxxxxxxxxx>
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base-commit: 7649ba73f9e7e1e04d0b46213e39c79ae09dd55c