problem(?) w/ libata

Hello

I have sata controller:
01:0b.0 RAID bus controller: CMD Technology Inc Silicon Image SiI 3112
SATARaid Controller (rev 02) Subsystem: CMD Technology Inc: Unknown
device 6112 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66Mhz+ UDF- FastB2B+
ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency:
32, cache line size 08 Interrupt: pin A routed to IRQ 11

	Region 0: I/O ports at 9c00 [size=8]
	Region 1: I/O ports at a000 [size=4]
	Region 2: I/O ports at a400 [size=8]
	Region 3: I/O ports at a800 [size=4]
	Region 4: I/O ports at ac00 [size=16]
	Region 5: Memory at e0000000 (32-bit, non-prefetchable) [size=512]
	Expansion ROM at <unassigned> [disabled] [size=512K]
	Capabilities: [60] Power Management version 2
		Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA

PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=2
PME-
Kernel: 2.6.8.1-mm4 w/ libata config in attachment and this problem:

[root@slack:~#] hdparm -Tt /dev/sda

/dev/sda:
Timing buffer-cache reads: 1392 MB in 2.00 seconds = 694.72 MB/sec

BLKFLSBUF failed: Operation not supported

HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not supported

Timing buffered disk reads: 96 MB in 3.06 seconds = 31.40 MB/sec
BLKFLSBUF failed: Operation not supported HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not supported
[root@slack:~#]

I have not this error on 2.6.8-rc4-mm1 (with the same config). Is this bug or new feature?

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