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net: autoconvert trivial BKL users to private mutex

Browse source 
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 <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: [email protected]
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Arnd Bergmann 2010-07-11 11:18:57 +00:00 • committed by David S. Miller
commit 15fd0cd9a2
4 changed files with 22 additions and 21 deletions
Download patch file Download diff file Expand all files Collapse all files

7
net/wanrouter/wanmain.c
View file

@ -48,7 +48,7 @@
#include <linux/kernel.h>
#include <linux/module.h> /* support for loadable modules */
#include <linux/slab.h> /* kmalloc(), kfree() */
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/mm.h>
#include <linux/string.h> /* inline mem*, str* functions */
@ -71,6 +71,7 @@
* WAN device IOCTL handlers
*/
static DEFINE_MUTEX(wanrouter_mutex);
static int wanrouter_device_setup(struct wan_device *wandev,
wandev_conf_t __user *u_conf);
static int wanrouter_device_stat(struct wan_device *wandev,
@ -376,7 +377,7 @@ long wanrouter_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (wandev->magic != ROUTER_MAGIC)
return -EINVAL;
lock_kernel();
mutex_lock(&wanrouter_mutex);
switch (cmd) {
case ROUTER_SETUP:
err = wanrouter_device_setup(wandev, data);
@ -408,7 +409,7 @@ long wanrouter_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
err = wandev->ioctl(wandev, cmd, arg);
else err = -EINVAL;
}
unlock_kernel();
mutex_unlock(&wanrouter_mutex);
return err;
}

7
net/wanrouter/wanproc.c
View file

@ -27,7 +27,7 @@
#include <linux/module.h>
#include <linux/wanrouter.h> /* WAN router API definitions */
#include <linux/seq_file.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <net/net_namespace.h>
#include <asm/io.h>
@ -66,6 +66,7 @@
* /proc/net/router
*/
static DEFINE_MUTEX(config_mutex);
static struct proc_dir_entry *proc_router;
/* Strings */
@ -85,7 +86,7 @@ static void *r_start(struct seq_file *m, loff_t *pos)
struct wan_device *wandev;
loff_t l = *pos;
lock_kernel();
mutex_lock(&config_mutex);
if (!l--)
return SEQ_START_TOKEN;
for (wandev = wanrouter_router_devlist; l-- && wandev;
@ -104,7 +105,7 @@ static void *r_next(struct seq_file *m, void *v, loff_t *pos)
static void r_stop(struct seq_file *m, void *v)
__releases(kernel_lock)
{
unlock_kernel();
mutex_unlock(&config_mutex);
}
static int config_show(struct seq_file *m, void *v)