diff options
author | Arnd Bergmann <arnd@arndb.de> | 2010-07-11 11:18:57 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2010-07-13 03:21:47 (GMT) |
commit | 15fd0cd9a2ad24a78fbee369dec8ca660979d57e (patch) | |
tree | d81059460702ebfe4617ec6efd6efa7886ac673b /drivers/net/ppp_generic.c | |
parent | 76a64921dad9acd76270dc74249f0dfe11c84bb8 (diff) | |
download | linux-15fd0cd9a2ad24a78fbee369dec8ca660979d57e.tar.xz |
net: autoconvert trivial BKL users to private mutex
All these files use the big kernel lock in a trivial
way to serialize their private file operations,
typically resulting from an earlier semi-automatic
pushdown from VFS.
None of these drivers appears to want to lock against
other code, and they all use the BKL as the top-level
lock in their file operations, meaning that there
is no lock-order inversion problem.
Consequently, we can remove the BKL completely,
replacing it with a per-file mutex in every case.
Using a scripted approach means we can avoid
typos.
file=$1
name=$2
if grep -q lock_kernel ${file} ; then
if grep -q 'include.*linux.mutex.h' ${file} ; then
sed -i '/include.*<linux\/smp_lock.h>/d' ${file}
else
sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file}
fi
sed -i ${file} \
-e "/^#include.*linux.mutex.h/,$ {
1,/^\(static\|int\|long\)/ {
/^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex);
} }" \
-e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \
-e '/[ ]*cycle_kernel_lock();/d'
else
sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \
-e '/cycle_kernel_lock()/d'
fi
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ppp_generic.c')
-rw-r--r-- | drivers/net/ppp_generic.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c index e7b4187..6695a51 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> @@ -180,6 +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); @@ -362,7 +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. */ @@ -582,7 +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) @@ -594,7 +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; } @@ -602,7 +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) { @@ -624,7 +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; } @@ -634,7 +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: @@ -782,7 +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; } @@ -795,7 +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 */ @@ -846,7 +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; } |