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Subject[PATCH] raw1394 : Fix hang on unload
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Date
I was seeing rmmod getting stuck consistently in D state while removing
raw1394. Looking at raw1394.c:cleanup_raw1394 - the order of doing
things seemed incorrect to me after comparing other places in raw1394.c
which do the same thing but with a different order.

bash R running task 0 4319 3884 3900
(NOTLB)
rmmod D 0000008428792a16 0 4490 3900
(NOTLB)
ffff81001cff9dd8 0000000000000082 0000000000000000 0000000100000000
0000007400000000 ffff8100211c9070 000000000000097b
ffff81002c8a2800
ffffffff80397c97 ffff81002b6f9360
Call Trace:<ffffffff80379d25>{__down+421}
<ffffffff80133510>{default_wake_function+0}
<ffffffff8037cd8c>{__down_failed+53}
<ffffffff801c0e40>{generic_delete_inode+0}
<ffffffff8029e540>{.text.lock.driver+5}
<ffffffff885a8260>{:raw1394:cleanup_raw1394+16}
<ffffffff8015eb31>{sys_delete_module+497}
<ffffffff8021a692>{__up_write+514}
<ffffffff80183efb>{sys_munmap+107} <ffffffff8010ecda>{system_call
+126}
Attached patch fixes the rmmod raw1394 hang. Tested.

Parag
--- drivers/ieee1394/raw1394.c.orig 2005-02-06 14:34:58.000000000 -0500
+++ drivers/ieee1394/raw1394.c 2005-02-06 14:36:18.000000000 -0500
@@ -2758,10 +2758,10 @@

static void __exit cleanup_raw1394(void)
{
- hpsb_unregister_protocol(&raw1394_driver);
cdev_del(&raw1394_cdev);
devfs_remove(RAW1394_DEVICE_NAME);
hpsb_unregister_highlevel(&raw1394_highlevel);
+ hpsb_unregister_protocol(&raw1394_driver);
}

module_init(init_raw1394);
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