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: 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

drivers/s390/block/dasd.c

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 8373ca0..38e6fa9 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -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 @@
 	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 @@
 		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 @@
 {
 	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

diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 1557214..26075e9 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -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 @@
 	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 @@
 		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

diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 2bd72aa..9b43ae9 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -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 @@
 	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 @@
 	bdev->bd_block_size = 4096;
 	rc = 0;
 out:
-	unlock_kernel();
 	return rc;
 }
 
@@ -797,7 +794,6 @@
 	struct segment_info *entry;
 	int rc;
 
-	lock_kernel();
 	if (!dev_info) {
 		rc = -ENODEV;
 		goto out;
@@ -815,7 +811,6 @@
 	up_write(&dcssblk_devices_sem);
 	rc = 0;
 out:
-	unlock_kernel();
 	return rc;
 }