Date: Tue, 6 Feb 2007 02:34:45 +0100 (CET)
From: Stefan Richter <[email protected]>
Since my commit 8252bbb1363b7fe963a3eb6f8a36da619a6f5a65 in 2.6.20-rc1,
host devices have a dummy driver attached. Alas the driver was not
registered before use if ieee1394 was loaded with disable_nodemgr=1.
This resulted in non-functional FireWire drivers or kernel lockup.
http://bugzilla.kernel.org/show_bug.cgi?id=7942
Signed-off-by: Stefan Richter <[email protected]>
---
drivers/ieee1394/nodemgr.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
same as commit 91efa462054d44ae52b0c6c8325ed5e899f2cd17 in linux-2.6.20-git#
(Side note: The parameter disable_nodemgr=1 is merely an optional
tuning parameter for people who know what they are doing and who don't
need device discovery and bus management.)
Index: linux-2.6.20/drivers/ieee1394/nodemgr.c
===================================================================
--- linux-2.6.20.orig/drivers/ieee1394/nodemgr.c
+++ linux-2.6.20/drivers/ieee1394/nodemgr.c
@@ -274,7 +274,6 @@ static struct device_driver nodemgr_mid_
struct device nodemgr_dev_template_host = {
.bus = &ieee1394_bus_type,
.release = nodemgr_release_host,
- .driver = &nodemgr_mid_layer_driver,
};
@@ -1889,22 +1888,31 @@ int init_ieee1394_nodemgr(void)
error = class_register(&nodemgr_ne_class);
if (error)
- return error;
-
+ goto fail_ne;
error = class_register(&nodemgr_ud_class);
- if (error) {
- class_unregister(&nodemgr_ne_class);
- return error;
- }
+ if (error)
+ goto fail_ud;
error = driver_register(&nodemgr_mid_layer_driver);
+ if (error)
+ goto fail_ml;
+ /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
+ nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
+
hpsb_register_highlevel(&nodemgr_highlevel);
return 0;
+
+fail_ml:
+ class_unregister(&nodemgr_ud_class);
+fail_ud:
+ class_unregister(&nodemgr_ne_class);
+fail_ne:
+ return error;
}
void cleanup_ieee1394_nodemgr(void)
{
hpsb_unregister_highlevel(&nodemgr_highlevel);
-
+ driver_unregister(&nodemgr_mid_layer_driver);
class_unregister(&nodemgr_ud_class);
class_unregister(&nodemgr_ne_class);
}
--
Stefan Richter
-=====-=-=== --=- -=-=-
http://arcgraph.de/sr/
-
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