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block: autoconvert trivial BKL users to private mutex

Browse Source 
The block device drivers have all gained new lock_kernel
calls from a recent pushdown, and some of the drivers
were already using the BKL before.

This turns the BKL into a set of per-driver mutexes.
Still need to check whether this is safe to do.

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 613655fa39
commit 2a48fc0ab2
43 changed files with 277 additions and 250 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/block/z2ram.c
+8 -7
View File
@@ -33,7 +33,7 @@
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/bitops.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <asm/setup.h>
@@ -57,6 +57,7 @@ extern struct mem_info m68k_memory[NUM_MEMINFO];
#define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
static DEFINE_MUTEX(z2ram_mutex);
static u_long *z2ram_map = NULL;
static u_long z2ram_size = 0;
static int z2_count = 0;
@@ -154,7 +155,7 @@ static int z2_open(struct block_device *bdev, fmode_t mode)
device = MINOR(bdev->bd_dev);
lock_kernel();
mutex_lock(&z2ram_mutex);
if ( current_device != -1 && current_device != device )
{
rc = -EBUSY;
@@ -296,25 +297,25 @@ static int z2_open(struct block_device *bdev, fmode_t mode)
set_capacity(z2ram_gendisk, z2ram_size >> 9);
}
unlock_kernel();
mutex_unlock(&z2ram_mutex);
return 0;
err_out_kfree:
kfree(z2ram_map);
err_out:
unlock_kernel();
mutex_unlock(&z2ram_mutex);
return rc;
}
static int
z2_release(struct gendisk *disk, fmode_t mode)
{
lock_kernel();
mutex_lock(&z2ram_mutex);
if ( current_device == -1 ) {
unlock_kernel();
mutex_unlock(&z2ram_mutex);
return 0;
}
unlock_kernel();
mutex_unlock(&z2ram_mutex);
/*
* FIXME: unmap memory
*/