From: Prakash Punnoor <prakash@punnoor.de>
To: linux-kernel@vger.kernel.org
Subject: 2.6.24-rc1-gec3b67c1 broken reg. libata-sata_nv in non NCQ mode
Date: Sat, 27 Oct 2007 10:11:49 +0200
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Hi,

I cannot boot above kernel when I *disable* swncq support which got added i=
n=20
sata_nv. Problem seems that some component thinks driver is in ncq mode whi=
le=20
it is not, as I see a queue depth of 31 instead of 0 on boot., ie I see=20
something like this:

ata1.00: 625142448 sectors, multi 1: LBA48 NCQ (depth 31/32)

though I disabled ncq.And then boot "hangs" at

sd 0:0:0:0: [sda] 625142448 512-byte hardware sectors (320073 MB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't suppor=
t=20
DPO or FUA
 sda

while detecting partitions I guess. (Note, the boot messages are from ncq=20
enabled kernel, but look alike, at least regarding queue depth...) The kern=
el=20
doesn't really hang but tries detecting something while spitting out some=20
errors. I simply wasn't patient enough.

Anyway, I tried 2.6.23 with swncq patch on top, and here I don't have any=20
problems with swncq or w/o it. (NCQ depth also gets correctly reported). I=
=20
diffed the 2.6.23 patched driver with git one and they are nearly identical=
=20
excpet some ID changes, whcih don't affect me, es I have a MCP51 chipset. S=
o=20
something in libata changed and got broken or sata_nv wasn't adopted for th=
at=20
change.

HTH,
=2D-=20
(=C2=B0=3D                 =3D=C2=B0)
//\ Prakash Punnoor /\\
V_/                 \_V

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