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Message-ID: <5767b9100703070409o3e094420rf7ccffc436332184@mail.gmail.com>
Date: Wed, 7 Mar 2007 20:09:10 +0800
From: "Conke Hu" <conke.hu@gmail.com>
To: "Jeff Garzik" <jeff@garzik.org>, Alan <alan@lxorguk.ukuu.org.uk>,
       "Tejun Heo" <htejun@gmail.com>,
       "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: [BUG] ATAPI command TEST_UNIT_READY never succeeds!
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Hi,
    Do you ever noticed that the ATAPI command TEST_UNIT_READY always
fails to execute !?
    I debugged in the following environments:
        piix + Intel ICH6/ICH7 PATA
        atiixp + ATI SB600 PATA
        libata + ata_piix + Intel ICH6/ICH7 PATA
        libata + sata_sil24 + Silicon Image 3132
        libata + ahci + ATI SB600 SATA
        libata + ahci + Intel AHCI
    but none of them can execute TEST_UNIT_READY command successfully.
    For example, in ahci driver, ahci_interrupt() reads port status as
0x4000_0000, which indicates an taskfile error.


Conke