block: autoconvert trivial BKL users to private mutex

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>

24 files changed, 164 insertions, 143 deletions

diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index 4e2c367fec11..da0f6ddd7621 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -36,7 +36,7 @@
 #include <linux/ioport.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/reboot.h>
@@ -54,6 +54,7 @@
 #define DAC960_GAM_MINOR        252
 
 
+static DEFINE_MUTEX(DAC960_mutex);
 static DAC960_Controller_T *DAC960_Controllers[DAC960_MaxControllers];
 static int DAC960_ControllerCount;
 static struct proc_dir_entry *DAC960_ProcDirectoryEntry;
@@ -81,7 +82,7 @@ static int DAC960_open(struct block_device *bdev, fmode_t mode)
         int drive_nr = (long)disk->private_data;
         int ret = -ENXIO;
 
-        lock_kernel();
+        mutex_lock(&DAC960_mutex);
         if (p->FirmwareType == DAC960_V1_Controller) {
                 if (p->V1.LogicalDriveInformation[drive_nr].
                     LogicalDriveState == DAC960_V1_LogicalDrive_Offline)
@@ -99,7 +100,7 @@ static int DAC960_open(struct block_device *bdev, fmode_t mode)
                 goto out;
         ret = 0;
 out:
-        unlock_kernel();
+        mutex_unlock(&DAC960_mutex);
         return ret;
 }
 
@@ -6625,7 +6626,7 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
   long ErrorCode = 0;
   if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 
-  lock_kernel();
+  mutex_lock(&DAC960_mutex);
   switch (Request)
     {
     case DAC960_IOCTL_GET_CONTROLLER_COUNT:
@@ -7056,7 +7057,7 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
       default:
         ErrorCode = -ENOTTY;
     }
-  unlock_kernel();
+  mutex_unlock(&DAC960_mutex);
   return ErrorCode;
 }
 
diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c
index 76f114f0bba3..4b852c962266 100644
--- a/drivers/block/amiflop.c
+++ b/drivers/block/amiflop.c
@@ -60,7 +60,7 @@
 #include <linux/hdreg.h>
 #include <linux/delay.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/amifdreg.h>
 #include <linux/amifd.h>
 #include <linux/buffer_head.h>
@@ -109,6 +109,7 @@
 #define FD_HD_3         0x55555555  /* high-density 3.5" (1760K) drive */
 #define FD_DD_5         0xaaaaaaaa  /* double-density 5.25" (440K) drive */
 
+static DEFINE_MUTEX(amiflop_mutex);
 static unsigned long int fd_def_df0 = FD_DD_3;     /* default for df0 if it doesn't identify */
 
 module_param(fd_def_df0, ulong, 0);
@@ -1506,9 +1507,9 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode,
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&amiflop_mutex);
         ret = fd_locked_ioctl(bdev, mode, cmd, param);
-        unlock_kernel();
+        mutex_unlock(&amiflop_mutex);
 
         return ret;
 }
@@ -1555,11 +1556,11 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
         int old_dev;
         unsigned long flags;
 
-        lock_kernel();
+        mutex_lock(&amiflop_mutex);
         old_dev = fd_device[drive];
 
         if (fd_ref[drive] && old_dev != system) {
-                unlock_kernel();
+                mutex_unlock(&amiflop_mutex);
                 return -EBUSY;
         }
 
@@ -1575,7 +1576,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
                         rel_fdc();
 
                         if (wrprot) {
-                                unlock_kernel();
+                                mutex_unlock(&amiflop_mutex);
                                 return -EROFS;
                         }
                 }
@@ -1594,7 +1595,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
         printk(KERN_INFO "fd%d: accessing %s-disk with %s-layout\n",drive,
                unit[drive].type->name, data_types[system].name);
 
-        unlock_kernel();
+        mutex_unlock(&amiflop_mutex);
         return 0;
 }
 
@@ -1603,7 +1604,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
         struct amiga_floppy_struct *p = disk->private_data;
         int drive = p - unit;
 
-        lock_kernel();
+        mutex_lock(&amiflop_mutex);
         if (unit[drive].dirty == 1) {
                 del_timer (flush_track_timer + drive);
                 non_int_flush_track (drive);
@@ -1617,7 +1618,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 /* the mod_use counter is handled this way */
         floppy_off (drive | 0x40000000);
 #endif
-        unlock_kernel();
+        mutex_unlock(&amiflop_mutex);
         return 0;
 }
 
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index a946929735a5..f21c237a9e5e 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -12,9 +12,10 @@
 #include <linux/slab.h>
 #include <linux/genhd.h>
 #include <linux/netdevice.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include "aoe.h"
 
+static DEFINE_MUTEX(aoeblk_mutex);
 static struct kmem_cache *buf_pool_cache;
 
 static ssize_t aoedisk_show_state(struct device *dev,
@@ -125,16 +126,16 @@ aoeblk_open(struct block_device *bdev, fmode_t mode)
         struct aoedev *d = bdev->bd_disk->private_data;
         ulong flags;
 
-        lock_kernel();
+        mutex_lock(&aoeblk_mutex);
         spin_lock_irqsave(&d->lock, flags);
         if (d->flags & DEVFL_UP) {
                 d->nopen++;
                 spin_unlock_irqrestore(&d->lock, flags);
-                unlock_kernel();
+                mutex_unlock(&aoeblk_mutex);
                 return 0;
         }
         spin_unlock_irqrestore(&d->lock, flags);
-        unlock_kernel();
+        mutex_unlock(&aoeblk_mutex);
         return -ENODEV;
 }
 
diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index 4a1b9e7464aa..05d5ef172ca5 100644
--- a/drivers/block/aoe/aoechr.c
+++ b/drivers/block/aoe/aoechr.c
@@ -9,7 +9,7 @@
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/skbuff.h>
 #include "aoe.h"
 
@@ -37,6 +37,7 @@ struct ErrMsg {
         char *msg;
 };
 
+static DEFINE_MUTEX(aoechr_mutex);
 static struct ErrMsg emsgs[NMSG];
 static int emsgs_head_idx, emsgs_tail_idx;
 static struct completion emsgs_comp;
@@ -183,16 +184,16 @@ aoechr_open(struct inode *inode, struct file *filp)
 {
         int n, i;
 
-        lock_kernel();
+        mutex_lock(&aoechr_mutex);
         n = iminor(inode);
         filp->private_data = (void *) (unsigned long) n;
 
         for (i = 0; i < ARRAY_SIZE(chardevs); ++i)
                 if (chardevs[i].minor == n) {
-                        unlock_kernel();
+                        mutex_unlock(&aoechr_mutex);
                         return 0;
                 }
-        unlock_kernel();
+        mutex_unlock(&aoechr_mutex);
         return -EINVAL;
 }
 
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index aceb96476524..8c021bb7a991 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -67,7 +67,7 @@
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include <asm/atafd.h>
 #include <asm/atafdreg.h>
@@ -79,6 +79,7 @@
 
 #undef DEBUG
 
+static DEFINE_MUTEX(ataflop_mutex);
 static struct request_queue *floppy_queue;
 static struct request *fd_request;
 
@@ -1671,9 +1672,9 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode,
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&ataflop_mutex);
         ret = fd_locked_ioctl(bdev, mode, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&ataflop_mutex);
 
         return ret;
 }
@@ -1854,9 +1855,9 @@ static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&ataflop_mutex);
         ret = floppy_open(bdev, mode);
-        unlock_kernel();
+        mutex_unlock(&ataflop_mutex);
 
         return ret;
 }
@@ -1864,14 +1865,14 @@ static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
         struct atari_floppy_struct *p = disk->private_data;
-        lock_kernel();
+        mutex_lock(&ataflop_mutex);
         if (p->ref < 0)
                 p->ref = 0;
         else if (!p->ref--) {
                 printk(KERN_ERR "floppy_release with fd_ref == 0");
                 p->ref = 0;
         }
-        unlock_kernel();
+        mutex_unlock(&ataflop_mutex);
         return 0;
 }
 
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 1c7f63792ff8..82bfd5bb4a97 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -15,7 +15,7 @@
 #include <linux/blkdev.h>
 #include <linux/bio.h>
 #include <linux/highmem.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/radix-tree.h>
 #include <linux/buffer_head.h> /* invalidate_bh_lrus() */
 #include <linux/slab.h>
@@ -55,6 +55,7 @@ struct brd_device {
 /*
  * Look up and return a brd's page for a given sector.
  */
+static DEFINE_MUTEX(brd_mutex);
 static struct page *brd_lookup_page(struct brd_device *brd, sector_t sector)
 {
         pgoff_t idx;
@@ -402,7 +403,7 @@ static int brd_ioctl(struct block_device *bdev, fmode_t mode,
          * ram device BLKFLSBUF has special semantics, we want to actually
          * release and destroy the ramdisk data.
          */
-        lock_kernel();
+        mutex_lock(&brd_mutex);
         mutex_lock(&bdev->bd_mutex);
         error = -EBUSY;
         if (bdev->bd_openers <= 1) {
@@ -419,7 +420,7 @@ static int brd_ioctl(struct block_device *bdev, fmode_t mode,
                 error = 0;
         }
         mutex_unlock(&bdev->bd_mutex);
-        unlock_kernel();
+        mutex_unlock(&brd_mutex);
 
         return error;
 }
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 6124c2fd2d33..ba9c3a4947c7 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -26,7 +26,6 @@
 #include <linux/pci.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
 #include <linux/delay.h>
 #include <linux/major.h>
 #include <linux/fs.h>
@@ -66,6 +65,7 @@ MODULE_SUPPORTED_DEVICE("HP Smart Array Controllers");
 MODULE_VERSION("3.6.26");
 MODULE_LICENSE("GPL");
 
+static DEFINE_MUTEX(cciss_mutex);
 static int cciss_allow_hpsa;
 module_param(cciss_allow_hpsa, int, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(cciss_allow_hpsa,
@@ -1059,9 +1059,9 @@ static int cciss_unlocked_open(struct block_device *bdev, fmode_t mode)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&cciss_mutex);
         ret = cciss_open(bdev, mode);
-        unlock_kernel();
+        mutex_unlock(&cciss_mutex);
 
         return ret;
 }
@@ -1074,13 +1074,13 @@ static int cciss_release(struct gendisk *disk, fmode_t mode)
         ctlr_info_t *h;
         drive_info_struct *drv;
 
-        lock_kernel();
+        mutex_lock(&cciss_mutex);
         h = get_host(disk);
         drv = get_drv(disk);
         dev_dbg(&h->pdev->dev, "cciss_release %s\n", disk->disk_name);
         drv->usage_count--;
         h->usage_count--;
-        unlock_kernel();
+        mutex_unlock(&cciss_mutex);
         return 0;
 }
 
@@ -1088,9 +1088,9 @@ static int do_ioctl(struct block_device *bdev, fmode_t mode,
                     unsigned cmd, unsigned long arg)
 {
         int ret;
-        lock_kernel();
+        mutex_lock(&cciss_mutex);
         ret = cciss_ioctl(bdev, mode, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&cciss_mutex);
         return ret;
 }
 
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index d53b0291c44b..946dad4caef3 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -35,7 +35,7 @@
 #include <linux/seq_file.h>
 #include <linux/init.h>
 #include <linux/hdreg.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
 #include <linux/genhd.h>
@@ -68,6 +68,7 @@ MODULE_LICENSE("GPL");
 
 #define CPQARRAY_DMA_MASK       0xFFFFFFFF      /* 32 bit DMA */
 
+static DEFINE_MUTEX(cpqarray_mutex);
 static int nr_ctlr;
 static ctlr_info_t *hba[MAX_CTLR];
 
@@ -845,9 +846,9 @@ static int ida_unlocked_open(struct block_device *bdev, fmode_t mode)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&cpqarray_mutex);
         ret = ida_open(bdev, mode);
-        unlock_kernel();
+        mutex_unlock(&cpqarray_mutex);
 
         return ret;
 }
@@ -859,10 +860,10 @@ static int ida_release(struct gendisk *disk, fmode_t mode)
 {
         ctlr_info_t *host;
 
-        lock_kernel();
+        mutex_lock(&cpqarray_mutex);
         host = get_host(disk);
         host->usage_count--;
-        unlock_kernel();
+        mutex_unlock(&cpqarray_mutex);
 
         return 0;
 }
@@ -1217,9 +1218,9 @@ static int ida_ioctl(struct block_device *bdev, fmode_t mode,
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&cpqarray_mutex);
         ret = ida_locked_ioctl(bdev, mode, cmd, param);
-        unlock_kernel();
+        mutex_unlock(&cpqarray_mutex);
 
         return ret;
 }
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index fa650dd85b90..e4b56119866e 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -32,7 +32,7 @@
 #include <asm/types.h>
 #include <net/sock.h>
 #include <linux/ctype.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/fs.h>
 #include <linux/file.h>
 #include <linux/proc_fs.h>
@@ -64,6 +64,7 @@ struct after_state_chg_work {
         struct completion *done;
 };
 
+static DEFINE_MUTEX(drbd_main_mutex);
 int drbdd_init(struct drbd_thread *);
 int drbd_worker(struct drbd_thread *);
 int drbd_asender(struct drbd_thread *);
@@ -2536,7 +2537,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
         unsigned long flags;
         int rv = 0;
 
-        lock_kernel();
+        mutex_lock(&drbd_main_mutex);
         spin_lock_irqsave(&mdev->req_lock, flags);
         /* to have a stable mdev->state.role
          * and no race with updating open_cnt */
@@ -2551,7 +2552,7 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
         if (!rv)
                 mdev->open_cnt++;
         spin_unlock_irqrestore(&mdev->req_lock, flags);
-        unlock_kernel();
+        mutex_unlock(&drbd_main_mutex);
 
         return rv;
 }
@@ -2559,9 +2560,9 @@ static int drbd_open(struct block_device *bdev, fmode_t mode)
 static int drbd_release(struct gendisk *gd, fmode_t mode)
 {
         struct drbd_conf *mdev = gd->private_data;
-        lock_kernel();
+        mutex_lock(&drbd_main_mutex);
         mdev->open_cnt--;
-        unlock_kernel();
+        mutex_unlock(&drbd_main_mutex);
         return 0;
 }
 
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index cf04c1b234ed..3b57459bb745 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -178,7 +178,6 @@ static int print_unex = 1;
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/bio.h>
-#include <linux/smp_lock.h>
 #include <linux/string.h>
 #include <linux/jiffies.h>
 #include <linux/fcntl.h>
@@ -199,6 +198,7 @@ static int print_unex = 1;
  * It's been recommended that take about 1/4 of the default speed
  * in some more extreme cases.
  */
+static DEFINE_MUTEX(floppy_mutex);
 static int slow_floppy;
 
 #include <asm/dma.h>
@@ -3553,9 +3553,9 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode,
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&floppy_mutex);
         ret = fd_locked_ioctl(bdev, mode, cmd, param);
-        unlock_kernel();
+        mutex_unlock(&floppy_mutex);
 
         return ret;
 }
@@ -3616,7 +3616,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
         int drive = (long)disk->private_data;
 
-        lock_kernel();
+        mutex_lock(&floppy_mutex);
         mutex_lock(&open_lock);
         if (UDRS->fd_ref < 0)
                 UDRS->fd_ref = 0;
@@ -3627,7 +3627,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
         if (!UDRS->fd_ref)
                 opened_bdev[drive] = NULL;
         mutex_unlock(&open_lock);
-        unlock_kernel();
+        mutex_unlock(&floppy_mutex);
 
         return 0;
 }
@@ -3645,7 +3645,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
         int res = -EBUSY;
         char *tmp;
 
-        lock_kernel();
+        mutex_lock(&floppy_mutex);
         mutex_lock(&open_lock);
         old_dev = UDRS->fd_device;
         if (opened_bdev[drive] && opened_bdev[drive] != bdev)
@@ -3722,7 +3722,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
                         goto out;
         }
         mutex_unlock(&open_lock);
-        unlock_kernel();
+        mutex_unlock(&floppy_mutex);
         return 0;
 out:
         if (UDRS->fd_ref < 0)
@@ -3733,7 +3733,7 @@ out:
                 opened_bdev[drive] = NULL;
 out2:
         mutex_unlock(&open_lock);
-        unlock_kernel();
+        mutex_unlock(&floppy_mutex);
         return res;
 }
 
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 91797bbbe702..a10c8c9b6b78 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -67,7 +67,7 @@
 #include <linux/compat.h>
 #include <linux/suspend.h>
 #include <linux/freezer.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/writeback.h>
 #include <linux/buffer_head.h>          /* for invalidate_bdev() */
 #include <linux/completion.h>
@@ -77,6 +77,7 @@
 
 #include <asm/uaccess.h>
 
+static DEFINE_MUTEX(loop_mutex);
 static LIST_HEAD(loop_devices);
 static DEFINE_MUTEX(loop_devices_mutex);
 
@@ -1409,11 +1410,11 @@ static int lo_open(struct block_device *bdev, fmode_t mode)
 {
         struct loop_device *lo = bdev->bd_disk->private_data;
 
-        lock_kernel();
+        mutex_lock(&loop_mutex);
         mutex_lock(&lo->lo_ctl_mutex);
         lo->lo_refcnt++;
         mutex_unlock(&lo->lo_ctl_mutex);
-        unlock_kernel();
+        mutex_unlock(&loop_mutex);
 
         return 0;
 }
@@ -1423,7 +1424,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode)
         struct loop_device *lo = disk->private_data;
         int err;
 
-        lock_kernel();
+        mutex_lock(&loop_mutex);
         mutex_lock(&lo->lo_ctl_mutex);
 
         if (--lo->lo_refcnt)
@@ -1448,7 +1449,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode)
 out:
         mutex_unlock(&lo->lo_ctl_mutex);
 out_unlocked:
-        lock_kernel();
+        mutex_unlock(&loop_mutex);
         return 0;
 }
 
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 0daa422aa281..a32fb41246f8 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -24,7 +24,7 @@
 #include <linux/errno.h>
 #include <linux/file.h>
 #include <linux/ioctl.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/compiler.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
@@ -53,6 +53,7 @@
 #define DBG_BLKDEV      0x0100
 #define DBG_RX          0x0200
 #define DBG_TX          0x0400
+static DEFINE_MUTEX(nbd_mutex);
 static unsigned int debugflags;
 #endif /* NDEBUG */
 
@@ -717,11 +718,11 @@ static int nbd_ioctl(struct block_device *bdev, fmode_t mode,
         dprintk(DBG_IOCTL, "%s: nbd_ioctl cmd=%s(0x%x) arg=%lu\n",
                         lo->disk->disk_name, ioctl_cmd_to_ascii(cmd), cmd, arg);
 
-        lock_kernel();
+        mutex_lock(&nbd_mutex);
         mutex_lock(&lo->tx_lock);
         error = __nbd_ioctl(bdev, lo, cmd, arg);
         mutex_unlock(&lo->tx_lock);
-        unlock_kernel();
+        mutex_unlock(&nbd_mutex);
 
         return error;
 }
diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 76f8565e1e8d..62cec6afd7ad 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -138,9 +138,10 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
 #include <linux/cdrom.h>
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 
+static DEFINE_MUTEX(pcd_mutex);
 static DEFINE_SPINLOCK(pcd_lock);
 
 module_param(verbose, bool, 0644);
@@ -227,9 +228,9 @@ static int pcd_block_open(struct block_device *bdev, fmode_t mode)
         struct pcd_unit *cd = bdev->bd_disk->private_data;
         int ret;
 
-        lock_kernel();
+        mutex_lock(&pcd_mutex);
         ret = cdrom_open(&cd->info, bdev, mode);
-        unlock_kernel();
+        mutex_unlock(&pcd_mutex);
 
         return ret;
 }
@@ -237,9 +238,9 @@ static int pcd_block_open(struct block_device *bdev, fmode_t mode)
 static int pcd_block_release(struct gendisk *disk, fmode_t mode)
 {
         struct pcd_unit *cd = disk->private_data;
-        lock_kernel();
+        mutex_lock(&pcd_mutex);
         cdrom_release(&cd->info, mode);
-        unlock_kernel();
+        mutex_unlock(&pcd_mutex);
         return 0;
 }
 
@@ -249,9 +250,9 @@ static int pcd_block_ioctl(struct block_device *bdev, fmode_t mode,
         struct pcd_unit *cd = bdev->bd_disk->private_data;
         int ret;
 
-        lock_kernel();
+        mutex_lock(&pcd_mutex);
         ret = cdrom_ioctl(&cd->info, bdev, mode, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&pcd_mutex);
 
         return ret;
 }
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index 985f0d4f1d1e..c0ee1558b9bb 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -153,10 +153,11 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_GEO, D_SBY, D_DLY, D_SLV};
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/kernel.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 #include <linux/workqueue.h>
 
+static DEFINE_MUTEX(pd_mutex);
 static DEFINE_SPINLOCK(pd_lock);
 
 module_param(verbose, bool, 0);
@@ -736,14 +737,14 @@ static int pd_open(struct block_device *bdev, fmode_t mode)
 {
         struct pd_unit *disk = bdev->bd_disk->private_data;
 
-        lock_kernel();
+        mutex_lock(&pd_mutex);
         disk->access++;
 
         if (disk->removable) {
                 pd_special_command(disk, pd_media_check);
                 pd_special_command(disk, pd_door_lock);
         }
-        unlock_kernel();
+        mutex_unlock(&pd_mutex);
         return 0;
 }
 
@@ -771,10 +772,10 @@ static int pd_ioctl(struct block_device *bdev, fmode_t mode,
 
         switch (cmd) {
         case CDROMEJECT:
-                lock_kernel();
+                mutex_lock(&pd_mutex);
                 if (disk->access == 1)
                         pd_special_command(disk, pd_eject);
-                unlock_kernel();
+                mutex_unlock(&pd_mutex);
                 return 0;
         default:
                 return -EINVAL;
@@ -785,10 +786,10 @@ static int pd_release(struct gendisk *p, fmode_t mode)
 {
         struct pd_unit *disk = p->private_data;
 
-        lock_kernel();
+        mutex_lock(&pd_mutex);
         if (!--disk->access && disk->removable)
                 pd_special_command(disk, pd_door_unlock);
-        unlock_kernel();
+        mutex_unlock(&pd_mutex);
 
         return 0;
 }
diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index 4457b494882a..635f25dd9e10 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -152,9 +152,10 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_LUN, D_DLY};
 #include <linux/spinlock.h>
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 
+static DEFINE_MUTEX(pf_mutex);
 static DEFINE_SPINLOCK(pf_spin_lock);
 
 module_param(verbose, bool, 0644);
@@ -302,7 +303,7 @@ static int pf_open(struct block_device *bdev, fmode_t mode)
         struct pf_unit *pf = bdev->bd_disk->private_data;
         int ret;
 
-        lock_kernel();
+        mutex_lock(&pf_mutex);
         pf_identify(pf);
 
         ret = -ENODEV;
@@ -318,7 +319,7 @@ static int pf_open(struct block_device *bdev, fmode_t mode)
         if (pf->removable)
                 pf_lock(pf, 1);
 out:
-        unlock_kernel();
+        mutex_unlock(&pf_mutex);
         return ret;
 }
 
@@ -349,9 +350,9 @@ static int pf_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, u
 
         if (pf->access != 1)
                 return -EBUSY;
-        lock_kernel();
+        mutex_lock(&pf_mutex);
         pf_eject(pf);
-        unlock_kernel();
+        mutex_unlock(&pf_mutex);
 
         return 0;
 }
@@ -360,9 +361,9 @@ static int pf_release(struct gendisk *disk, fmode_t mode)
 {
         struct pf_unit *pf = disk->private_data;
 
-        lock_kernel();
+        mutex_lock(&pf_mutex);
         if (pf->access <= 0) {
-                unlock_kernel();
+                mutex_unlock(&pf_mutex);
                 return -EINVAL;
         }
 
@@ -371,7 +372,7 @@ static int pf_release(struct gendisk *disk, fmode_t mode)
         if (!pf->access && pf->removable)
                 pf_lock(pf, 0);
 
-        unlock_kernel();
+        mutex_unlock(&pf_mutex);
         return 0;
 
 }
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index b1cbeb59bb76..1e85678dd4f6 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -57,7 +57,6 @@
 #include <linux/seq_file.h>
 #include <linux/miscdevice.h>
 #include <linux/freezer.h>
-#include <linux/smp_lock.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
 #include <scsi/scsi_cmnd.h>
@@ -86,6 +85,7 @@
 
 #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1))
 
+static DEFINE_MUTEX(pktcdvd_mutex);
 static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
 static struct proc_dir_entry *pkt_proc;
 static int pktdev_major;
@@ -2383,7 +2383,7 @@ static int pkt_open(struct block_device *bdev, fmode_t mode)
 
         VPRINTK(DRIVER_NAME": entering open\n");
 
-        lock_kernel();
+        mutex_lock(&pktcdvd_mutex);
         mutex_lock(&ctl_mutex);
         pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev));
         if (!pd) {
@@ -2411,7 +2411,7 @@ static int pkt_open(struct block_device *bdev, fmode_t mode)
         }
 
         mutex_unlock(&ctl_mutex);
-        unlock_kernel();
+        mutex_unlock(&pktcdvd_mutex);
         return 0;
 
 out_dec:
@@ -2419,7 +2419,7 @@ out_dec:
 out:
         VPRINTK(DRIVER_NAME": failed open (%d)\n", ret);
         mutex_unlock(&ctl_mutex);
-        unlock_kernel();
+        mutex_unlock(&pktcdvd_mutex);
         return ret;
 }
 
@@ -2428,7 +2428,7 @@ static int pkt_close(struct gendisk *disk, fmode_t mode)
         struct pktcdvd_device *pd = disk->private_data;
         int ret = 0;
 
-        lock_kernel();
+        mutex_lock(&pktcdvd_mutex);
         mutex_lock(&ctl_mutex);
         pd->refcnt--;
         BUG_ON(pd->refcnt < 0);
@@ -2437,7 +2437,7 @@ static int pkt_close(struct gendisk *disk, fmode_t mode)
                 pkt_release_dev(pd, flush);
         }
         mutex_unlock(&ctl_mutex);
-        unlock_kernel();
+        mutex_unlock(&pktcdvd_mutex);
         return ret;
 }
 
@@ -2773,7 +2773,7 @@ static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
         VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd,
                 MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
 
-        lock_kernel();
+        mutex_lock(&pktcdvd_mutex);
         switch (cmd) {
         case CDROMEJECT:
                 /*
@@ -2798,7 +2798,7 @@ static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
                 VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd);
                 ret = -ENOTTY;
         }
-        unlock_kernel();
+        mutex_unlock(&pktcdvd_mutex);
 
         return ret;
 }
diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index 2e46815876df..75333d0a3327 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -20,7 +20,7 @@
 #include <linux/fd.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/hdreg.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>
@@ -222,6 +222,7 @@ extern int swim_read_sector_header(struct swim __iomem *base,
 extern int swim_read_sector_data(struct swim __iomem *base,
                                  unsigned char *data);
 
+static DEFINE_MUTEX(swim_mutex);
 static inline void set_swim_mode(struct swim __iomem *base, int enable)
 {
         struct iwm __iomem *iwm_base;
@@ -666,9 +667,9 @@ static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&swim_mutex);
         ret = floppy_open(bdev, mode);
-        unlock_kernel();
+        mutex_unlock(&swim_mutex);
 
         return ret;
 }
@@ -678,7 +679,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
         struct floppy_state *fs = disk->private_data;
         struct swim __iomem *base = fs->swd->base;
 
-        lock_kernel();
+        mutex_lock(&swim_mutex);
         if (fs->ref_count < 0)
                 fs->ref_count = 0;
         else if (fs->ref_count > 0)
@@ -686,7 +687,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 
         if (fs->ref_count == 0)
                 swim_motor(base, OFF);
-        unlock_kernel();
+        mutex_unlock(&swim_mutex);
 
         return 0;
 }
@@ -704,9 +705,9 @@ static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
         case FDEJECT:
                 if (fs->ref_count != 1)
                         return -EBUSY;
-                lock_kernel();
+                mutex_lock(&swim_mutex);
                 err = floppy_eject(fs);
-                unlock_kernel();
+                mutex_unlock(&swim_mutex);
                 return err;
 
         case FDGETPRM:
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index cc6a3864822c..bf3a5b859299 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -25,7 +25,7 @@
 #include <linux/ioctl.h>
 #include <linux/blkdev.h>
 #include <linux/interrupt.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
 #include <asm/io.h>
@@ -36,6 +36,7 @@
 #include <asm/machdep.h>
 #include <asm/pmac_feature.h>
 
+static DEFINE_MUTEX(swim3_mutex);
 static struct request_queue *swim3_queue;
 static struct gendisk *disks[2];
 static struct request *fd_req;
@@ -873,9 +874,9 @@ static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&swim3_mutex);
         ret = floppy_locked_ioctl(bdev, mode, cmd, param);
-        unlock_kernel();
+        mutex_unlock(&swim3_mutex);
 
         return ret;
 }
@@ -953,9 +954,9 @@ static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&swim3_mutex);
         ret = floppy_open(bdev, mode);
-        unlock_kernel();
+        mutex_unlock(&swim3_mutex);
 
         return ret;
 }
@@ -964,13 +965,13 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
 {
         struct floppy_state *fs = disk->private_data;
         struct swim3 __iomem *sw = fs->swim3;
-        lock_kernel();
+        mutex_lock(&swim3_mutex);
         if (fs->ref_count > 0 && --fs->ref_count == 0) {
                 swim3_action(fs, MOTOR_OFF);
                 out_8(&sw->control_bic, 0xff);
                 swim3_select(fs, RELAX);
         }
-        unlock_kernel();
+        mutex_unlock(&swim3_mutex);
         return 0;
 }
 
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index c48e14878582..b5690a045a01 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -28,7 +28,7 @@
 #include <linux/timer.h>
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <scsi/scsi.h>
 
 #define DRV_NAME "ub"
@@ -248,6 +248,7 @@ struct ub_completion {
         spinlock_t lock;
 };
 
+static DEFINE_MUTEX(ub_mutex);
 static inline void ub_init_completion(struct ub_completion *x)
 {
         x->done = 0;
@@ -1715,9 +1716,9 @@ static int ub_bd_unlocked_open(struct block_device *bdev, fmode_t mode)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&ub_mutex);
         ret = ub_bd_open(bdev, mode);
-        unlock_kernel();
+        mutex_unlock(&ub_mutex);
 
         return ret;
 }
@@ -1730,9 +1731,9 @@ static int ub_bd_release(struct gendisk *disk, fmode_t mode)
         struct ub_lun *lun = disk->private_data;
         struct ub_dev *sc = lun->udev;
 
-        lock_kernel();
+        mutex_lock(&ub_mutex);
         ub_put(sc);
-        unlock_kernel();
+        mutex_unlock(&ub_mutex);
 
         return 0;
 }
@@ -1747,9 +1748,9 @@ static int ub_bd_ioctl(struct block_device *bdev, fmode_t mode,
         void __user *usermem = (void __user *) arg;
         int ret;
 
-        lock_kernel();
+        mutex_lock(&ub_mutex);
         ret = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, usermem);
-        unlock_kernel();
+        mutex_unlock(&ub_mutex);
 
         return ret;
 }
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index f651e51a3319..e2ff697697c2 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -41,7 +41,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/string.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/dma-mapping.h>
 #include <linux/completion.h>
 #include <linux/device.h>
@@ -73,6 +73,7 @@ enum {
         MAX_DISK_NAME = FIELD_SIZEOF(struct gendisk, disk_name)
 };
 
+static DEFINE_MUTEX(viodasd_mutex);
 static DEFINE_SPINLOCK(viodasd_spinlock);
 
 #define VIOMAXREQ               16
@@ -180,9 +181,9 @@ static int viodasd_unlocked_open(struct block_device *bdev, fmode_t mode)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&viodasd_mutex);
         ret = viodasd_open(bdev, mode);
-        unlock_kernel();
+        mutex_unlock(&viodasd_mutex);
 
         return ret;
 }
@@ -196,7 +197,7 @@ static int viodasd_release(struct gendisk *disk, fmode_t mode)
         struct viodasd_device *d = disk->private_data;
         HvLpEvent_Rc hvrc;
 
-        lock_kernel();
+        mutex_lock(&viodasd_mutex);
         /* Send the event to OS/400.  We DON'T expect a response */
         hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
                         HvLpEvent_Type_VirtualIo,
@@ -210,7 +211,7 @@ static int viodasd_release(struct gendisk *disk, fmode_t mode)
         if (hvrc != 0)
                 pr_warning("HV close call failed %d\n", (int)hvrc);
 
-        unlock_kernel();
+        mutex_unlock(&viodasd_mutex);
 
         return 0;
 }
diff --git a/drivers/block/xd.c b/drivers/block/xd.c
index d5a3cd750561..4abd2bcd20fb 100644
--- a/drivers/block/xd.c
+++ b/drivers/block/xd.c
@@ -46,7 +46,7 @@
 #include <linux/init.h>
 #include <linux/wait.h>
 #include <linux/blkdev.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/blkpg.h>
 #include <linux/delay.h>
 #include <linux/io.h>
@@ -58,6 +58,7 @@
 
 #include "xd.h"
 
+static DEFINE_MUTEX(xd_mutex);
 static void __init do_xd_setup (int *integers);
 #ifdef MODULE
 static int xd[5] = { -1,-1,-1,-1, };
@@ -381,9 +382,9 @@ static int xd_ioctl(struct block_device *bdev, fmode_t mode,
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&xd_mutex);
         ret = xd_locked_ioctl(bdev, mode, cmd, param);
-        unlock_kernel();
+        mutex_unlock(&xd_mutex);
 
         return ret;
 }
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index ab735a605cf3..3ff06f475eef 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -41,7 +41,7 @@
 #include <linux/cdrom.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/scatterlist.h>
 
 #include <xen/xen.h>
@@ -69,6 +69,7 @@ struct blk_shadow {
         unsigned long frame[BLKIF_MAX_SEGMENTS_PER_REQUEST];
 };
 
+static DEFINE_MUTEX(blkfront_mutex);
 static const struct block_device_operations xlvbd_block_fops;
 
 #define BLK_RING_SIZE __RING_SIZE((struct blkif_sring *)0, PAGE_SIZE)
@@ -1201,7 +1202,7 @@ static int blkif_open(struct block_device *bdev, fmode_t mode)
         struct blkfront_info *info;
         int err = 0;
 
-        lock_kernel();
+        mutex_lock(&blkfront_mutex);
 
         info = disk->private_data;
         if (!info) {
@@ -1219,7 +1220,7 @@ static int blkif_open(struct block_device *bdev, fmode_t mode)
         mutex_unlock(&info->mutex);
 
 out:
-        unlock_kernel();
+        mutex_unlock(&blkfront_mutex);
         return err;
 }
 
@@ -1229,7 +1230,7 @@ static int blkif_release(struct gendisk *disk, fmode_t mode)
         struct block_device *bdev;
         struct xenbus_device *xbdev;
 
-        lock_kernel();
+        mutex_lock(&blkfront_mutex);
 
         bdev = bdget_disk(disk, 0);
         bdput(bdev);
@@ -1263,7 +1264,7 @@ static int blkif_release(struct gendisk *disk, fmode_t mode)
         }
 
 out:
-        unlock_kernel();
+        mutex_unlock(&blkfront_mutex);
         return 0;
 }
 
diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index 057413bb16e2..6e968cd4893c 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -89,7 +89,7 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/blkdev.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/ata.h>
 #include <linux/hdreg.h>
 #include <linux/platform_device.h>
@@ -214,6 +214,7 @@ struct ace_device {
         u16 cf_id[ATA_ID_WORDS];
 };
 
+static DEFINE_MUTEX(xsysace_mutex);
 static int ace_major;
 
 /* ---------------------------------------------------------------------
@@ -903,13 +904,13 @@ static int ace_open(struct block_device *bdev, fmode_t mode)
 
         dev_dbg(ace->dev, "ace_open() users=%i\n", ace->users + 1);
 
-        lock_kernel();
+        mutex_lock(&xsysace_mutex);
         spin_lock_irqsave(&ace->lock, flags);
         ace->users++;
         spin_unlock_irqrestore(&ace->lock, flags);
 
         check_disk_change(bdev);
-        unlock_kernel();
+        mutex_unlock(&xsysace_mutex);
 
         return 0;
 }
@@ -922,7 +923,7 @@ static int ace_release(struct gendisk *disk, fmode_t mode)
 
         dev_dbg(ace->dev, "ace_release() users=%i\n", ace->users - 1);
 
-        lock_kernel();
+        mutex_lock(&xsysace_mutex);
         spin_lock_irqsave(&ace->lock, flags);
         ace->users--;
         if (ace->users == 0) {
@@ -930,7 +931,7 @@ static int ace_release(struct gendisk *disk, fmode_t mode)
                 ace_out(ace, ACE_CTRL, val & ~ACE_CTRL_LOCKREQ);
         }
         spin_unlock_irqrestore(&ace->lock, flags);
-        unlock_kernel();
+        mutex_unlock(&xsysace_mutex);
         return 0;
 }
 
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index d75b2bb601ad..dcd4cfcf4126 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -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
      */