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Commit cfdb00a7 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

s390/block: kill the big kernel lock 



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: default avatarArnd 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
parent 54066a57

drivers/s390/block/dasd.c

+0 −6
Original line number Diff line number Diff line
@@ -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;

}

drivers/s390/block/dasd_ioctl.c

+2 −15
Original line number Diff line number Diff line
@@ -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>
@@ -370,8 +369,7 @@ 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,

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;
@@ -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;

}

drivers/s390/block/dcssblk.c

+0 −5
Original line number Diff line number Diff line
@@ -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;

}