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ppp: Add ppp_dev_name() exported function

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ppp_dev_name() gives PPP users visibility of a ppp channel's device
name. This can be used by L2TP drivers to dump the assigned PPP
interface name.

Signed-off-by: James Chapman <jchapman@katalix.com>
Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
James Chapman 2010-04-02 06:18:39 +00:00 committed by David S. Miller
parent fd558d186d
commit 63f96072f9
2 changed files with 22 additions and 0 deletions
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19
drivers/net/ppp_generic.c
View file

@ -2162,6 +2162,24 @@ int ppp_unit_number(struct ppp_channel *chan)
return unit;
}
/*
* Return the PPP device interface name of a channel.
*/
char *ppp_dev_name(struct ppp_channel *chan)
{
struct channel *pch = chan->ppp;
char *name = NULL;
if (pch) {
read_lock_bh(&pch->upl);
if (pch->ppp && pch->ppp->dev)
name = pch->ppp->dev->name;
read_unlock_bh(&pch->upl);
}
return name;
}
/*
* Disconnect a channel from the generic layer.
* This must be called in process context.
@ -2890,6 +2908,7 @@ EXPORT_SYMBOL(ppp_register_channel);
EXPORT_SYMBOL(ppp_unregister_channel);
EXPORT_SYMBOL(ppp_channel_index);
EXPORT_SYMBOL(ppp_unit_number);
EXPORT_SYMBOL(ppp_dev_name);
EXPORT_SYMBOL(ppp_input);
EXPORT_SYMBOL(ppp_input_error);
EXPORT_SYMBOL(ppp_output_wakeup);

3
include/linux/ppp_channel.h
View file

@ -72,6 +72,9 @@ extern int ppp_channel_index(struct ppp_channel *);
/* Get the unit number associated with a channel, or -1 if none */
extern int ppp_unit_number(struct ppp_channel *);
/* Get the device name associated with a channel, or NULL if none */
extern char *ppp_dev_name(struct ppp_channel *);
/*
* SMP locking notes:
* The channel code must ensure that when it calls ppp_unregister_channel,