Messages in this thread |  | | From | "Hen, Shmulik" <> | Subject | RE: catch 22 - porting net driver from 2.2 to 2.4 | Date | Mon, 13 Nov 2000 09:09:41 -0800 |
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"Jeff Garzik" wrote: > Theoretically, if you call unregister_netdev from rmmon, it should grab > rtnl_lock and then complete the operation for you. If that doesn't work > for you, it sounds like you are not setting up, or cleaning up, > something correctly. > > Basically... it sounds like there are still bugs in your driver that > need working out :)
I followed the value of dev->refcnt and there is something strange. before the call to register_netdev it is set to 0 and after that it is increased to 1. but before the call to unregister_netdev it is somehow 2.
How can I tell who is modifying it and when ?
I tried using kdb to find out but it keeps hanging the machine. I wanted to place a breakpoint that will pop if a certain memory address is accessed so I did the following:
static void *p; (global - at the top of my source file) EXPORT_SYMBOL (p);
in my probe function: p = (void*) dev->refcnt;
> insmod my_module > ksyms
this showed that p is at address 0xd081ee90
then from within kdb: kdb> md 0xd081ee90 0xd081ee90 c470bedc ........ ........
kdb> bpha 0xc470bedc Forced Global Breakpoint at...
kdb> go
system hung
Is there a way to place a breakpoint on a memory address access ?
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