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>

diff --git a/drivers/pps/clients/pps_parport.c b/drivers/pps/clients/pps_parport.c
index 32221ef..c571d6d 100644 (file)
--- a/drivers/pps/clients/pps_parport.c
+++ b/drivers/pps/clients/pps_parport.c
@@ -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;

diff --git a/drivers/pps/generators/pps_gen_parport.c b/drivers/pps/generators/pps_gen_parport.c
index 5c32f8d..b93af3e 100644 (file)
--- a/drivers/pps/generators/pps_gen_parport.c
+++ b/drivers/pps/generators/pps_gen_parport.c
@@ -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;