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s390/block: kill the big kernel lock

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The dasd and dcssblk drivers gained the big
kernel lock in the recent pushdown from the
block layer, but they don't really need it,
so remove the calls without a replacement.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-s390@vger.kernel.org
This commit is contained in:
Arnd Bergmann 2010-05-31 22:38:40 +02:00
parent 54066a57c5
commit cfdb00a77e
3 changed files with 2 additions and 26 deletions
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6
drivers/s390/block/dasd.c
View File

@ -21,7 +21,6 @@
#include <linux/hdreg.h>
#include <linux/async.h>
#include <linux/mutex.h>
#include <linux/smp_lock.h>
#include <asm/ccwdev.h>
#include <asm/ebcdic.h>
@ -2236,7 +2235,6 @@ static int dasd_open(struct block_device *bdev, fmode_t mode)
if (!block)
return -ENODEV;
lock_kernel();
base = block->base;
atomic_inc(&block->open_count);
if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
@ -2271,14 +2269,12 @@ static int dasd_open(struct block_device *bdev, fmode_t mode)
goto out;
}
unlock_kernel();
return 0;
out:
module_put(base->discipline->owner);
unlock:
atomic_dec(&block->open_count);
unlock_kernel();
return rc;
}
@ -2286,10 +2282,8 @@ static int dasd_release(struct gendisk *disk, fmode_t mode)
{
struct dasd_block *block = disk->private_data;
lock_kernel();
atomic_dec(&block->open_count);
module_put(block->base->discipline->owner);
unlock_kernel();
return 0;
}

17
drivers/s390/block/dasd_ioctl.c
View File

@ -16,7 +16,6 @@
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/blkpg.h>
#include <linux/smp_lock.h>
#include <linux/slab.h>
#include <asm/compat.h>
#include <asm/ccwdev.h>
@ -370,9 +369,8 @@ static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
return ret;
}
static int
dasd_do_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
int dasd_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct dasd_block *block = bdev->bd_disk->private_data;
void __user *argp;
@ -430,14 +428,3 @@ dasd_do_ioctl(struct block_device *bdev, fmode_t mode,
return -EINVAL;
}
}
int dasd_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
int rc;
lock_kernel();
rc = dasd_do_ioctl(bdev, mode, cmd, arg);
unlock_kernel();
return rc;
}

5
drivers/s390/block/dcssblk.c
View File

@ -14,7 +14,6 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/smp_lock.h>
#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
@ -776,7 +775,6 @@ dcssblk_open(struct block_device *bdev, fmode_t mode)
struct dcssblk_dev_info *dev_info;
int rc;
lock_kernel();
dev_info = bdev->bd_disk->private_data;
if (NULL == dev_info) {
rc = -ENODEV;
@ -786,7 +784,6 @@ dcssblk_open(struct block_device *bdev, fmode_t mode)
bdev->bd_block_size = 4096;
rc = 0;
out:
unlock_kernel();
return rc;
}
@ -797,7 +794,6 @@ dcssblk_release(struct gendisk *disk, fmode_t mode)
struct segment_info *entry;
int rc;
lock_kernel();
if (!dev_info) {
rc = -ENODEV;
goto out;
@ -815,7 +811,6 @@ dcssblk_release(struct gendisk *disk, fmode_t mode)
up_write(&dcssblk_devices_sem);
rc = 0;
out:
unlock_kernel();
return rc;
}