linux-kernel - 2.6.24-rc1-gec3b67c1 broken reg. libata-sata

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Message-Id: <200710271011.53372.prakash@punnoor.de>
Date:	Sat, 27 Oct 2007 10:11:49 +0200
From:	Prakash Punnoor <prakash@...noor.de>
To:	linux-kernel@...r.kernel.org
Cc:	linux-ide@...r.kernel.org
Subject: 2.6.24-rc1-gec3b67c1 broken reg. libata-sata_nv in non NCQ mode

Hi,

I cannot boot above kernel when I *disable* swncq support which got added in 
sata_nv. Problem seems that some component thinks driver is in ncq mode while 
it is not, as I see a queue depth of 31 instead of 0 on boot., ie I see 
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 support 
DPO or FUA
 sda

while detecting partitions I guess. (Note, the boot messages are from ncq 
enabled kernel, but look alike, at least regarding queue depth...) The kernel 
doesn't really hang but tries detecting something while spitting out some 
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 
problems with swncq or w/o it. (NCQ depth also gets correctly reported). I 
diffed the 2.6.23 patched driver with git one and they are nearly identical 
excpet some ID changes, whcih don't affect me, es I have a MCP51 chipset. So 
something in libata changed and got broken or sata_nv wasn't adopted for that 
change.

HTH,
-- 
(°=                 =°)
//\ Prakash Punnoor /\\
V_/                 \_V

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