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Subject[PATCH] Re: dev_get_by_name without dev_put
Em Wed, Jul 04, 2001 at 03:49:46PM +0200, fabrizio.gennari@philips.com escreveu:
> Every time dev_get_by_name is called, and it has returned a valid struct net_device*, dev_put should be called afterwards, because otherwise the machine hangs when the device is unregistered (since dev->refcnt > 1). However, it seems that some drivers do
> not call dev_put after dev_get_by_name: for example, drivers/net/pppoe.c at line 573 and net/core/dv.c at line 168. Am I wrong?

For pppoe (and one has to look at the set_item and see if delete_item is
needed).

- Arnaldo

--- linux-2.4.5-ac24/drivers/net/pppoe.c Tue Jul 3 18:45:41 2001
+++ linux-2.4.5-ac24.acme/drivers/net/pppoe.c Wed Jul 4 11:00:47 2001
@@ -567,17 +567,17 @@
if (!dev)
goto end;

+ po->pppoe_dev = dev;
+
if( ! (dev->flags & IFF_UP) )
- goto end;
+ goto err_put;
memcpy(&po->pppoe_pa,
&sp->sa_addr.pppoe,
sizeof(struct pppoe_addr));

error = set_item(po);
if (error < 0)
- goto end;
-
- po->pppoe_dev = dev;
+ goto err_put;

po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
dev->hard_header_len);
@@ -586,6 +586,8 @@
po->chan.ops = &pppoe_chan_ops;

error = ppp_register_channel(&po->chan);
+ if (error)
+ goto err_put;

sk->state = PPPOX_CONNECTED;
}
@@ -595,6 +597,10 @@
end:
release_sock(sk);
return error;
+err_put:
+ dev_put(po->pppoe_dev);
+ po->pppoe_dev = NULL;
+ goto end;
}

- Arnaldo
-
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