linux-kernel - Re: possible bug in ide-disk.c (2.6.18.2 but also older)

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Date:	Thu, 23 Nov 2006 18:05:57 +0100
From:	Andreas Leitgeb <avl@...ic.at>
To:	Andreas Leitgeb <avl@...ic.at>
Cc:	Alan <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: possible bug in ide-disk.c (2.6.18.2 but also older)

On Wed, Nov 22, 2006 at 11:57:35AM +0100, Andreas Leitgeb wrote:
> Last evening I got my hands back on that machine,
> checked the kernel-config, and saw that GPT was 
> already *unselected*!
> Actually, the whole "Advanced partition..."-bundle
> was unchecked.

Meanwhile I also found this bugreport (for ubuntu):
  https://launchpad.net/distros/ubuntu/+source/linux-source-2.6.15/+bug/26119
which has quite a few "me,too"s, most of them referring to the 
same (as mine) Seagate 40GB model ST340823A, some others to a 
seagate 20GB model.
And, they are better than me at collecting relevant facts ;-)

Btw., this excerpt:
  hdc: Host Protected Area detected.
          current capacity is 78165360 sectors (40020 MB)
          native  capacity is 78165361 sectors (40020 MB)
  hdc: Host Protected Area disabled.
  hdc: 78165361 sectors (40020 MB) w/1024KiB Cache, CHS=65535/16/63, UDMA(100)
  hdc: cache flushes not supported

looked the same for me those days,  but when retrying lately
with a yet unpatched 2.6.18.3, it reported the current capacity
as 78165359 (one less!) (but the native capacity still 78165361)

After patching away the "addr++;", the logs now say:
  hda: 78165360 sectors (40020 MB) w/512KiB Cache, CHS=65535/16/63, UDMA(100)
and I really got 78165360 sectors according to /proc/ide/hda/capacity.

PS:
Will this turn out as:
  "drive is broken, no kernel workaround will be done, end this thread"
or is a real solution in any way realistic?

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