"lost interrupt" in ide.c / ide-cd.c

Matthias Riese (mri@megatel.de)
Thu, 20 May 1999 12:09:00 +0200

Problem:
Total lockup, not even sysrq worked, when trying
to mount cdroms. Sometimes kernel message "lost interrupt".

I started to switch all the defs/undefs in ide-cd.c
(SLOW_IO ...)
I finally got my broken cdroms to work with 2.2.9
disabling dma for the drives using hdparm. Now:

1.
Kernel config help says about "enabling dma by default"
only sth about a controller i dont own. Perhaps
the documentation should be extended to "this controller
and any flakey hardware"?

2.
What reasons exist for a "lost interrupt"? How about
inserting a list about this into Documentation/ide.txt,
perhaps:
problem: lost interrupt
possible solutions: disable dma
...

Matthias Riese

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