[BUG] 2.6.19-rc1: ata_piix takes excessively long to probe a nonexistent device

["Kevin Radloff" <radsaq@gmail.com>]

Using ata_piix on a Fujitsu laptop with an ICH4-M and a HD on the
first channel and a DVD/CDRW drive on the second channel, I see this:

ata1: PATA max UDMA/100 cmd 0x1F0 ctl 0x3F6 bmdma 0x1810 irq 14
ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0x1818 irq 15
scsi0 : ata_piix
ata1.00: ATA-6, max UDMA/100, 156301488 sectors: LBA
ata1.00: ata1: dev 0 multi count 16
ata1.00: configured for UDMA/100
scsi1 : ata_piix
ata2.00: ATAPI, max UDMA/33
ata2.01: qc timeout (cmd 0xa1)
ata2.01: failed to IDENTIFY (I/O error, err_mask=0x4)
ata2: failed to recover some devices, retrying in 5 secs
ata2.01: qc timeout (cmd 0xa1)
ata2.01: failed to IDENTIFY (I/O error, err_mask=0x4)
ata2: failed to recover some devices, retrying in 5 secs
ata2.01: qc timeout (cmd 0xa1)
ata2.01: failed to IDENTIFY (I/O error, err_mask=0x4)
ata2: failed to recover some devices, retrying in 5 secs
ata2.00: configured for UDMA/33
scsi 0:0:0:0: Direct-Access     ATA      FUJITSU MHT2080A 0022 PQ: 0 ANSI: 5
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
sda: sda1 sda2 < sda5 > sda3
sd 0:0:0:0: Attached scsi disk sda
scsi 1:0:0:0: CD-ROM            MATSHITA UJDA755 DVD/CDRW 1.00 PQ: 0 ANSI: 5

The timeout/retry periods add an extra minute or two to kernel boot
process. This did not occur with 2.6.17 + Alan's PATA patches
(although I did see a single message about dev 1 failing to IDENTIFY
with that).

--
Kevin 'radsaq' Radloff
radsaq@gmail.com
http://thesaq.com/
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