[7790] in linux-scsi channel archive
SCSI patches against 2.3.35.
daemon@ATHENA.MIT.EDU (Eric Youngdale)
Mon Jan 3 00:34:16 2000
Date: Mon, 3 Jan 2000 00:27:30 -0500 (EST)
From: Eric Youngdale <eric@andante.org>
To: linux-scsi@vger.rutgers.edu
Message-ID: <Pine.LNX.4.10.10001012209360.20014-200000@gwyn.tux.org>
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--1624180858-891426471-946783114=:20014
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I am enclosing patches against linux-2.3.35 - these should
correct a couple of issues that people have reported.
1) I *think* I have finally fixed the DMA exhaustion warning
message problem. The cause is that scsi_malloc can only return bounce
buffer segments of <= PAGE_SIZE, and I had forgotten this little detail. I
am toying with the idea of scaling this pool down to a small emergency
allocation and relying upon kmalloc(size, GFP_DMA) for the bulk of the
work, but now is not the time to try anything like that. The fix was to
scsi_merge.c, and was a little ugly. People with hosts that do ISA DMA
would see a little more overhead in doing the extra computations, but
ultimately it needs to be done right and if people want high performance
they shouldn't be using ISA bus host adapters. The thing that scares me
about these changes is that they worked the first time :-). I will be
testing them a bit more myself.
2) I have corrected an issue where the ppa driver would hang up if
you inserted the module without media in the drive and then later inserted
media.
3) I fixed the bug I mentioned in the earlier message, where a
single SCpnt was getting queued to the low-level driver in some instances
when there are bad sectors.
4) I fixed a secondary bug that comes up when a device is taken
offline where the scatter-gather table and bounce buffers were not being
deallocated, and the DMA pool is exhausted.
5) I have cleaned out a bit more dead code that I have identified,
and updated some stale comments here and there.
There is something else I am still looking at - a remnant of the
bugs I discovered when looking at error handling. It seems that in some
cases when you get MEDIUM_ERROR it launches into the error handler thread,
and ultimately takes the thing offline. Not the correct behavior - it
should just report the thing up to the higher levels.
Taking devices offline still isn't optimal. It breaks the cycle
of infinite attempts to remedy the error (which is good), but the device
is unusable, unmountable, etc, etc). I think I need to play with
scsi_debug and fix it to allow just enough access so that you can unmount
the sucker.
-Eric
"The world was a library, and its books were the stones, leaves,
brooks, grass, and the birds of the earth. We learned to do what only
a student of nature ever learns, and that was to feel beauty."
Chief Luther Standing Bear - Teton Sioux
--1624180858-891426471-946783114=:20014
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Content-ID: <Pine.LNX.4.10.10001030027300.20014@gwyn.tux.org>
Content-Description: Patches against 2.3.35
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