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path: root/drivers/net/ppp_generic.c
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Diffstat (limited to 'drivers/net/ppp_generic.c')
-rw-r--r--drivers/net/ppp_generic.c37
1 files changed, 15 insertions, 22 deletions
diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c
index 1b2c2915020..6695a51e09e 100644
--- a/drivers/net/ppp_generic.c
+++ b/drivers/net/ppp_generic.c
@@ -40,7 +40,6 @@
#include <linux/if_arp.h>
#include <linux/ip.h>
#include <linux/tcp.h>
-#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/rwsem.h>
#include <linux/stddef.h>
@@ -69,7 +68,6 @@
#define MPHDRLEN 6 /* multilink protocol header length */
#define MPHDRLEN_SSN 4 /* ditto with short sequence numbers */
-#define MIN_FRAG_SIZE 64
/*
* An instance of /dev/ppp can be associated with either a ppp
@@ -181,6 +179,7 @@ struct channel {
* channel.downl.
*/
+static DEFINE_MUTEX(ppp_mutex);
static atomic_t ppp_unit_count = ATOMIC_INIT(0);
static atomic_t channel_count = ATOMIC_INIT(0);
@@ -363,7 +362,6 @@ static const int npindex_to_ethertype[NUM_NP] = {
*/
static int ppp_open(struct inode *inode, struct file *file)
{
- cycle_kernel_lock();
/*
* This could (should?) be enforced by the permissions on /dev/ppp.
*/
@@ -539,14 +537,9 @@ static int get_filter(void __user *arg, struct sock_filter **p)
}
len = uprog.len * sizeof(struct sock_filter);
- code = kmalloc(len, GFP_KERNEL);
- if (code == NULL)
- return -ENOMEM;
-
- if (copy_from_user(code, uprog.filter, len)) {
- kfree(code);
- return -EFAULT;
- }
+ code = memdup_user(uprog.filter, len);
+ if (IS_ERR(code))
+ return PTR_ERR(code);
err = sk_chk_filter(code, uprog.len);
if (err) {
@@ -588,7 +581,7 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
* this fd and reopening /dev/ppp.
*/
err = -EINVAL;
- lock_kernel();
+ mutex_lock(&ppp_mutex);
if (pf->kind == INTERFACE) {
ppp = PF_TO_PPP(pf);
if (file == ppp->owner)
@@ -600,7 +593,7 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
} else
printk(KERN_DEBUG "PPPIOCDETACH file->f_count=%ld\n",
atomic_long_read(&file->f_count));
- unlock_kernel();
+ mutex_unlock(&ppp_mutex);
return err;
}
@@ -608,7 +601,7 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
struct channel *pch;
struct ppp_channel *chan;
- lock_kernel();
+ mutex_lock(&ppp_mutex);
pch = PF_TO_CHANNEL(pf);
switch (cmd) {
@@ -630,7 +623,7 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
err = chan->ops->ioctl(chan, cmd, arg);
up_read(&pch->chan_sem);
}
- unlock_kernel();
+ mutex_unlock(&ppp_mutex);
return err;
}
@@ -640,7 +633,7 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return -EINVAL;
}
- lock_kernel();
+ mutex_lock(&ppp_mutex);
ppp = PF_TO_PPP(pf);
switch (cmd) {
case PPPIOCSMRU:
@@ -788,7 +781,7 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
default:
err = -ENOTTY;
}
- unlock_kernel();
+ mutex_unlock(&ppp_mutex);
return err;
}
@@ -801,7 +794,7 @@ static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf,
struct ppp_net *pn;
int __user *p = (int __user *)arg;
- lock_kernel();
+ mutex_lock(&ppp_mutex);
switch (cmd) {
case PPPIOCNEWUNIT:
/* Create a new ppp unit */
@@ -852,7 +845,7 @@ static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf,
default:
err = -ENOTTY;
}
- unlock_kernel();
+ mutex_unlock(&ppp_mutex);
return err;
}
@@ -1933,9 +1926,9 @@ ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
/* If the queue is getting long, don't wait any longer for packets
before the start of the queue. */
if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN) {
- struct sk_buff *skb = skb_peek(&ppp->mrq);
- if (seq_before(ppp->minseq, skb->sequence))
- ppp->minseq = skb->sequence;
+ struct sk_buff *mskb = skb_peek(&ppp->mrq);
+ if (seq_before(ppp->minseq, mskb->sequence))
+ ppp->minseq = mskb->sequence;
}
/* Pull completed packets off the queue and receive them. */