Messages in this thread | | | Date | Fri, 30 Nov 2001 13:11:15 +0100 (MET) | From | "Maciej W. Rozycki" <> | Subject | Re: Patch: Fix serial module use count (2.4.16 _and_ 2.5) |
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On Fri, 30 Nov 2001, Russell King wrote:
> Have you audited all the tty drivers in 2.4 to make sure that they clean > up safely?
No, of course not -- if I had got a response like "this looks mostly OK, but please check other drivers", then I would have certainly done. I think drivers/tc/zs.c is OK, too, but this was more than a year ago, so I can't recall now, sorry.
> I don't believe the serial code will clean up safely as it stands for > starters if block_til_ready in serial.c fails, leaving an interrupt > in use. Further attempts to open the serial device will probably fail. > > Try this as any user with your patch applied: > > $ stty -clocal -F /dev/ttyS0 > $ cat /proc/interrupts > $ cat /dev/ttyS0 > ^c > $ cat /proc/interrupts > > I think you'll find your serial port interrupt is still claimed, despite > the module being marked as not in use.
Indeed -- maybe something was changed past 2.4.5, after all. I'll check how things look like these days. I nowhere use serial.c as a module anymore, as all systems I maintain are now configured for the serial console, so I might have missed something.
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +
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