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Date: Fri, 19 Nov 2010 10:20:57 +1100
From: Andrew Hendry <andrew.hendry@...il.com>
To: netdev@...r.kernel.org
Subject: [PATCH 1/4] X25: pushdown bkl in ioctls
Push down the bkl in the ioctls so they can be removed one at a time.
Signed-off-by: Andrew Hendry <andrew.hendry@...il.com>
---
net/x25/af_x25.c | 41 ++++++++++++++++++++++++++++++++++++++---
1 files changed, 38 insertions(+), 3 deletions(-)
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index f7af98d..c99029b 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -1357,14 +1357,16 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
void __user *argp = (void __user *)arg;
int rc;
- lock_kernel();
switch (cmd) {
case TIOCOUTQ: {
- int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
+ int amount;
+ lock_kernel();
+ amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
if (amount < 0)
amount = 0;
rc = put_user(amount, (unsigned int __user *)argp);
+ unlock_kernel();
break;
}
@@ -1375,23 +1377,29 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
* These two are safe on a single CPU system as
* only user tasks fiddle here
*/
+ lock_kernel();
if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
amount = skb->len;
rc = put_user(amount, (unsigned int __user *)argp);
+ unlock_kernel();
break;
}
case SIOCGSTAMP:
rc = -EINVAL;
+ lock_kernel();
if (sk)
rc = sock_get_timestamp(sk,
(struct timeval __user *)argp);
+ unlock_kernel();
break;
case SIOCGSTAMPNS:
rc = -EINVAL;
+ lock_kernel();
if (sk)
rc = sock_get_timestampns(sk,
(struct timespec __user *)argp);
+ unlock_kernel();
break;
case SIOCGIFADDR:
case SIOCSIFADDR:
@@ -1410,27 +1418,36 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
rc = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
+ lock_kernel();
rc = x25_route_ioctl(cmd, argp);
+ unlock_kernel();
break;
case SIOCX25GSUBSCRIP:
+ lock_kernel();
rc = x25_subscr_ioctl(cmd, argp);
+ unlock_kernel();
break;
case SIOCX25SSUBSCRIP:
rc = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
+ lock_kernel();
rc = x25_subscr_ioctl(cmd, argp);
+ unlock_kernel();
break;
case SIOCX25GFACILITIES: {
struct x25_facilities fac = x25->facilities;
+ lock_kernel();
rc = copy_to_user(argp, &fac,
sizeof(fac)) ? -EFAULT : 0;
+ unlock_kernel();
break;
}
case SIOCX25SFACILITIES: {
struct x25_facilities facilities;
rc = -EFAULT;
+ lock_kernel();
if (copy_from_user(&facilities, argp,
sizeof(facilities)))
break;
@@ -1466,12 +1483,15 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
break;
x25->facilities = facilities;
rc = 0;
+ unlock_kernel();
break;
}
case SIOCX25GDTEFACILITIES: {
+ lock_kernel();
rc = copy_to_user(argp, &x25->dte_facilities,
sizeof(x25->dte_facilities));
+ unlock_kernel();
if (rc)
rc = -EFAULT;
break;
@@ -1480,6 +1500,7 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
case SIOCX25SDTEFACILITIES: {
struct x25_dte_facilities dtefacs;
rc = -EFAULT;
+ lock_kernel();
if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
break;
rc = -EINVAL;
@@ -1496,13 +1517,16 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
break;
x25->dte_facilities = dtefacs;
rc = 0;
+ unlock_kernel();
break;
}
case SIOCX25GCALLUSERDATA: {
struct x25_calluserdata cud = x25->calluserdata;
+ lock_kernel();
rc = copy_to_user(argp, &cud,
sizeof(cud)) ? -EFAULT : 0;
+ unlock_kernel();
break;
}
@@ -1510,6 +1534,7 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
struct x25_calluserdata calluserdata;
rc = -EFAULT;
+ lock_kernel();
if (copy_from_user(&calluserdata, argp,
sizeof(calluserdata)))
break;
@@ -1517,24 +1542,29 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
if (calluserdata.cudlength > X25_MAX_CUD_LEN)
break;
x25->calluserdata = calluserdata;
+ unlock_kernel();
rc = 0;
break;
}
case SIOCX25GCAUSEDIAG: {
struct x25_causediag causediag;
+ lock_kernel();
causediag = x25->causediag;
rc = copy_to_user(argp, &causediag,
sizeof(causediag)) ? -EFAULT : 0;
+ unlock_kernel();
break;
}
case SIOCX25SCAUSEDIAG: {
struct x25_causediag causediag;
rc = -EFAULT;
+ lock_kernel();
if (copy_from_user(&causediag, argp, sizeof(causediag)))
break;
x25->causediag = causediag;
+ unlock_kernel();
rc = 0;
break;
@@ -1543,6 +1573,7 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
case SIOCX25SCUDMATCHLEN: {
struct x25_subaddr sub_addr;
rc = -EINVAL;
+ lock_kernel();
if(sk->sk_state != TCP_CLOSE)
break;
rc = -EFAULT;
@@ -1553,21 +1584,25 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
break;
x25->cudmatchlength = sub_addr.cudmatchlength;
+ unlock_kernel();
rc = 0;
break;
}
case SIOCX25CALLACCPTAPPRV: {
rc = -EINVAL;
+ lock_kernel();
if (sk->sk_state != TCP_CLOSE)
break;
clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
+ unlock_kernel();
rc = 0;
break;
}
case SIOCX25SENDCALLACCPT: {
rc = -EINVAL;
+ lock_kernel();
if (sk->sk_state != TCP_ESTABLISHED)
break;
/* must call accptapprv above */
@@ -1575,6 +1610,7 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
break;
x25_write_internal(sk, X25_CALL_ACCEPTED);
x25->state = X25_STATE_3;
+ unlock_kernel();
rc = 0;
break;
}
@@ -1583,7 +1619,6 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
rc = -ENOIOCTLCMD;
break;
}
- unlock_kernel();
return rc;
}
--
1.7.1
--
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