xiaomi-sm8450/android_kernel_xiaomi_sm8450
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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
Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/pci/hotplug/cpqphp_sysfs.c
View File

@@ -34,10 +34,11 @@
#include <linux/workqueue.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/debugfs.h>
#include "cpqphp.h"
static DEFINE_MUTEX(cpqphp_mutex);
static int show_ctrl (struct controller *ctrl, char *buf)
{
char *out = buf;
@@ -147,7 +148,7 @@ static int open(struct inode *inode, struct file *file)
struct ctrl_dbg *dbg;
int retval = -ENOMEM;
lock_kernel();
mutex_lock(&cpqphp_mutex);
dbg = kmalloc(sizeof(*dbg), GFP_KERNEL);
if (!dbg)
goto exit;
@@ -160,7 +161,7 @@ static int open(struct inode *inode, struct file *file)
file->private_data = dbg;
retval = 0;
exit:
unlock_kernel();
mutex_unlock(&cpqphp_mutex);
return retval;
}
@@ -169,7 +170,7 @@ static loff_t lseek(struct file *file, loff_t off, int whence)
struct ctrl_dbg *dbg;
loff_t new = -1;
lock_kernel();
mutex_lock(&cpqphp_mutex);
dbg = file->private_data;
switch (whence) {
@@ -181,10 +182,10 @@ static loff_t lseek(struct file *file, loff_t off, int whence)
break;
}
if (new < 0 || new > dbg->size) {
unlock_kernel();
mutex_unlock(&cpqphp_mutex);
return -EINVAL;
}
unlock_kernel();
mutex_unlock(&cpqphp_mutex);
return (file->f_pos = new);
}