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SubjectRe: Patch: Fix serial module use count (2.4.16 _and_ 2.5)
On Fri, Nov 30, 2001 at 11:44:14AM +0100, Maciej W. Rozycki wrote:
> Here is a fix I'm using for 2.4. It was submitted to Alan once, then a
> discussion was performed with a conclusion like "that may be a temporary
> fix for 2.4, but it needs a complete rework for 2.5". I'm not sure if the
> patch went in anywhere.

Have you audited all the tty drivers in 2.4 to make sure that they clean
up safely?

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
$ cat /proc/interrupts

I think you'll find your serial port interrupt is still claimed, despite
the module being marked as not in use.

Russell King ( The developer of ARM Linux

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