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drivers: autoconvert trivial BKL users to private mutex

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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.

These drivers do not seem to be under active
maintainance from my brief investigation. Apologies
to those maintainers that I have missed.

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>
This commit is contained in:
Arnd Bergmann
2010-06-02 14:28:52 +02:00
parent 609146fdb3
commit 613655fa39
35 changed files with 216 additions and 190 deletions
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8
drivers/char/ppdev.c
View File

@@ -67,7 +67,7 @@
#include <linux/slab.h>
#include <linux/major.h>
#include <linux/ppdev.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#define PP_VERSION "ppdev: user-space parallel port driver"
@@ -97,6 +97,7 @@ struct pp_struct {
/* ROUND_UP macro from fs/select.c */
#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
static DEFINE_MUTEX(pp_do_mutex);
static inline void pp_enable_irq (struct pp_struct *pp)
{
struct parport *port = pp->pdev->port;
@@ -630,9 +631,9 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret;
lock_kernel();
mutex_lock(&pp_do_mutex);
ret = pp_do_ioctl(file, cmd, arg);
unlock_kernel();
mutex_unlock(&pp_do_mutex);
return ret;
}
@@ -641,7 +642,6 @@ static int pp_open (struct inode * inode, struct file * file)
unsigned int minor = iminor(inode);
struct pp_struct *pp;
cycle_kernel_lock();
if (minor >= PARPORT_MAX)
return -ENXIO;