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pps: claim parallel port exclusively 

Both pps_parport and pps_gen_parport are written in a way that they
can't share a port with any other driver.  This can result in locking up
the process that loads modules or even the whole kernel if the modules
are compiled in.  Use PARPORT_FLAG_EXCL to indicate this.

Signed-off-by: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Cc: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexander Gordeev 2011-01-25 15:07:19 -08:00 committed by Linus Torvalds
parent a783ac4453
commit 4f542e3dd9
2 changed files with 2 additions and 2 deletions
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2
drivers/pps/clients/pps_parport.c
View File

@ -163,7 +163,7 @@ static void parport_attach(struct parport *port)
}
device->pardev = parport_register_device(port, KBUILD_MODNAME,
NULL, NULL, parport_irq, 0, device);
NULL, NULL, parport_irq, PARPORT_FLAG_EXCL, device);
if (!device->pardev) {
pr_err("couldn't register with %s\n", port->name);
goto err_free;

2
drivers/pps/generators/pps_gen_parport.c
View File

@ -198,7 +198,7 @@ static void parport_attach(struct parport *port)
}
device.pardev = parport_register_device(port, KBUILD_MODNAME,
NULL, NULL, NULL, 0, &device);
NULL, NULL, NULL, PARPORT_FLAG_EXCL, &device);
if (!device.pardev) {
pr_err("couldn't register with %s\n", port->name);
return;