linux-kernel - [BUG] ATAPI command TEST_UNIT

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Date:	Wed, 7 Mar 2007 20:09:10 +0800
From:	"Conke Hu" <conke.hu@...il.com>
To:	"Jeff Garzik" <jeff@...zik.org>, Alan <alan@...rguk.ukuu.org.uk>,
	"Tejun Heo" <htejun@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: [BUG] ATAPI command TEST_UNIT_READY never succeeds!

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
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