26 files changed, 160 insertions, 142 deletions

diff --git a/drivers/char/apm-emulation.c b/drivers/char/apm-emulation.c
index 033e1505fca9..6a420baea268 100644
--- a/drivers/char/apm-emulation.c
+++ b/drivers/char/apm-emulation.c
@@ -13,7 +13,7 @@
 #include <linux/module.h>
 #include <linux/poll.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/miscdevice.h>
@@ -126,6 +126,7 @@ struct apm_user {
 /*
  * Local variables
  */
+static DEFINE_MUTEX(apm_mutex);
 static atomic_t suspend_acks_pending = ATOMIC_INIT(0);
 static atomic_t userspace_notification_inhibit = ATOMIC_INIT(0);
 static int apm_disabled;
@@ -274,7 +275,7 @@ apm_ioctl(struct file *filp, u_int cmd, u_long arg)
         if (!as->suser || !as->writer)
                 return -EPERM;
 
-        lock_kernel();
+        mutex_lock(&apm_mutex);
         switch (cmd) {
         case APM_IOC_SUSPEND:
                 mutex_lock(&state_lock);
@@ -335,7 +336,7 @@ apm_ioctl(struct file *filp, u_int cmd, u_long arg)
                 mutex_unlock(&state_lock);
                 break;
         }
-        unlock_kernel();
+        mutex_unlock(&apm_mutex);
 
         return err;
 }
@@ -370,7 +371,7 @@ static int apm_open(struct inode * inode, struct file * filp)
 {
         struct apm_user *as;
 
-        lock_kernel();
+        mutex_lock(&apm_mutex);
         as = kzalloc(sizeof(*as), GFP_KERNEL);
         if (as) {
                 /*
@@ -390,7 +391,7 @@ static int apm_open(struct inode * inode, struct file * filp)
 
                 filp->private_data = as;
         }
-        unlock_kernel();
+        mutex_unlock(&apm_mutex);
 
         return as ? 0 : -ENOMEM;
 }
diff --git a/drivers/char/applicom.c b/drivers/char/applicom.c
index f4ae0e0fb631..e7ba774beda6 100644
--- a/drivers/char/applicom.c
+++ b/drivers/char/applicom.c
@@ -26,7 +26,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/miscdevice.h>
 #include <linux/pci.h>
 #include <linux/wait.h>
@@ -60,6 +60,7 @@
 #define PCI_DEVICE_ID_APPLICOM_PCI2000PFB     0x0003
 #endif
 
+static DEFINE_MUTEX(ac_mutex);
 static char *applicom_pci_devnames[] = {
         "PCI board",
         "PCI2000IBS / PCI2000CAN",
@@ -707,7 +708,7 @@ static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
         if (IS_ERR(adgl))
                 return PTR_ERR(adgl);
 
-        lock_kernel();  
+        mutex_lock(&ac_mutex);  
         IndexCard = adgl->num_card-1;
          
         if(cmd != 6 && ((IndexCard >= MAX_BOARD) || !apbs[IndexCard].RamIO)) {
@@ -717,7 +718,7 @@ static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                         warncount--;
                 }
                 kfree(adgl);
-                unlock_kernel();
+                mutex_unlock(&ac_mutex);
                 return -EINVAL;
         }
 
@@ -835,7 +836,7 @@ static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
         }
         Dummy = readb(apbs[IndexCard].RamIO + VERS);
         kfree(adgl);
-        unlock_kernel();
+        mutex_unlock(&ac_mutex);
         return 0;
 }
 
diff --git a/drivers/char/ds1302.c b/drivers/char/ds1302.c
index 170693c93c73..e3d72aa3cbd2 100644
--- a/drivers/char/ds1302.c
+++ b/drivers/char/ds1302.c
@@ -20,7 +20,7 @@
 #include <linux/miscdevice.h>
 #include <linux/delay.h>
 #include <linux/bcd.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
 
@@ -32,6 +32,7 @@
 
 #define RTC_MAJOR_NR 121 /* local major, change later */
 
+static DEFINE_MUTEX(rtc_mutex);
 static const char ds1302_name[] = "ds1302";
 
 /* Send 8 bits. */
@@ -164,9 +165,9 @@ static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                         struct rtc_time rtc_tm;
 
                         memset(&rtc_tm, 0, sizeof (struct rtc_time));
-                        lock_kernel();
+                        mutex_lock(&rtc_mutex);
                         get_rtc_time(&rtc_tm);
-                        unlock_kernel();
+                        mutex_unlock(&rtc_mutex);
                         if (copy_to_user((struct rtc_time*)arg, &rtc_tm, sizeof(struct rtc_time)))
                                 return -EFAULT;
                         return 0;
@@ -218,7 +219,7 @@ static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                         mon = bin2bcd(mon);
                         yrs = bin2bcd(yrs);
 
-                        lock_kernel();
+                        mutex_lock(&rtc_mutex);
                         local_irq_save(flags);
                         CMOS_WRITE(yrs, RTC_YEAR);
                         CMOS_WRITE(mon, RTC_MONTH);
@@ -227,7 +228,7 @@ static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                         CMOS_WRITE(min, RTC_MINUTES);
                         CMOS_WRITE(sec, RTC_SECONDS);
                         local_irq_restore(flags);
-                        unlock_kernel();
+                        mutex_unlock(&rtc_mutex);
 
                         /* Notice that at this point, the RTC is updated but
                          * the kernel is still running with the old time.
@@ -247,10 +248,10 @@ static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                         if(copy_from_user(&tcs_val, (int*)arg, sizeof(int)))
                                 return -EFAULT;
 
-                        lock_kernel();
+                        mutex_lock(&rtc_mutex);
                         tcs_val = RTC_TCR_PATTERN | (tcs_val & 0x0F);
                         ds1302_writereg(RTC_TRICKLECHARGER, tcs_val);
-                        unlock_kernel();
+                        mutex_unlock(&rtc_mutex);
                         return 0;
                 }
                 default:
diff --git a/drivers/char/ds1620.c b/drivers/char/ds1620.c
index dbee8688f75c..9aa1fd059aea 100644
--- a/drivers/char/ds1620.c
+++ b/drivers/char/ds1620.c
@@ -8,7 +8,7 @@
 #include <linux/proc_fs.h>
 #include <linux/capability.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
@@ -34,6 +34,7 @@
 #define CFG_CPU                 2
 #define CFG_1SHOT               1
 
+static DEFINE_MUTEX(ds1620_mutex);
 static const char *fan_state[] = { "off", "on", "on (hardwired)" };
 
 /*
@@ -210,7 +211,6 @@ static void ds1620_read_state(struct therm *therm)
 
 static int ds1620_open(struct inode *inode, struct file *file)
 {
-        cycle_kernel_lock();
         return nonseekable_open(inode, file);
 }
 
@@ -321,9 +321,9 @@ ds1620_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&ds1620_mutex);
         ret = ds1620_ioctl(file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&ds1620_mutex);
 
         return ret;
 }
diff --git a/drivers/char/dsp56k.c b/drivers/char/dsp56k.c
index 8a1b28a10ef0..b3c756227e39 100644
--- a/drivers/char/dsp56k.c
+++ b/drivers/char/dsp56k.c
@@ -32,7 +32,7 @@
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/device.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/firmware.h>
 #include <linux/platform_device.h>
 #include <linux/uaccess.h>      /* For put_user and get_user */
@@ -94,6 +94,7 @@
         } \
 }
 
+static DEFINE_MUTEX(dsp56k_mutex);
 static struct dsp56k_device {
         unsigned long in_use;
         long maxio, timeout;
@@ -330,9 +331,9 @@ static long dsp56k_ioctl(struct file *file, unsigned int cmd,
                         if (len > DSP56K_MAX_BINARY_LENGTH) {
                                 return -EINVAL;
                         }
-                        lock_kernel();
+                        mutex_lock(&dsp56k_mutex);
                         r = dsp56k_upload(bin, len);
-                        unlock_kernel();
+                        mutex_unlock(&dsp56k_mutex);
                         if (r < 0) {
                                 return r;
                         }
@@ -342,16 +343,16 @@ static long dsp56k_ioctl(struct file *file, unsigned int cmd,
                 case DSP56K_SET_TX_WSIZE:
                         if (arg > 4 || arg < 1)
                                 return -EINVAL;
-                        lock_kernel();
+                        mutex_lock(&dsp56k_mutex);
                         dsp56k.tx_wsize = (int) arg;
-                        unlock_kernel();
+                        mutex_unlock(&dsp56k_mutex);
                         break;
                 case DSP56K_SET_RX_WSIZE:
                         if (arg > 4 || arg < 1)
                                 return -EINVAL;
-                        lock_kernel();
+                        mutex_lock(&dsp56k_mutex);
                         dsp56k.rx_wsize = (int) arg;
-                        unlock_kernel();
+                        mutex_unlock(&dsp56k_mutex);
                         break;
                 case DSP56K_HOST_FLAGS:
                 {
@@ -363,7 +364,7 @@ static long dsp56k_ioctl(struct file *file, unsigned int cmd,
                         if(get_user(out, &hf->out) < 0)
                                 return -EFAULT;
 
-                        lock_kernel();
+                        mutex_lock(&dsp56k_mutex);
                         if ((dir & 0x1) && (out & 0x1))
                                 dsp56k_host_interface.icr |= DSP56K_ICR_HF0;
                         else if (dir & 0x1)
@@ -378,16 +379,16 @@ static long dsp56k_ioctl(struct file *file, unsigned int cmd,
                         if (dsp56k_host_interface.icr & DSP56K_ICR_HF1) status |= 0x2;
                         if (dsp56k_host_interface.isr & DSP56K_ISR_HF2) status |= 0x4;
                         if (dsp56k_host_interface.isr & DSP56K_ISR_HF3) status |= 0x8;
-                        unlock_kernel();
+                        mutex_unlock(&dsp56k_mutex);
                         return put_user(status, &hf->status);
                 }
                 case DSP56K_HOST_CMD:
                         if (arg > 31 || arg < 0)
                                 return -EINVAL;
-                        lock_kernel();
+                        mutex_lock(&dsp56k_mutex);
                         dsp56k_host_interface.cvr = (u_char)((arg & DSP56K_CVR_HV_MASK) |
                                                              DSP56K_CVR_HC);
-                        unlock_kernel();
+                        mutex_unlock(&dsp56k_mutex);
                         break;
                 default:
                         return -EINVAL;
@@ -427,7 +428,7 @@ static int dsp56k_open(struct inode *inode, struct file *file)
         int dev = iminor(inode) & 0x0f;
         int ret = 0;
 
-        lock_kernel();
+        mutex_lock(&dsp56k_mutex);
         switch(dev)
         {
         case DSP56K_DEV_56001:
@@ -454,7 +455,7 @@ static int dsp56k_open(struct inode *inode, struct file *file)
                 ret = -ENODEV;
         }
 out:
-        unlock_kernel();
+        mutex_unlock(&dsp56k_mutex);
         return ret;
 }
 
diff --git a/drivers/char/dtlk.c b/drivers/char/dtlk.c
index e3859d4eaead..8dd040a945d4 100644
--- a/drivers/char/dtlk.c
+++ b/drivers/char/dtlk.c
@@ -57,7 +57,7 @@
 #include <linux/ioport.h>       /* for request_region */
 #include <linux/delay.h>        /* for loops_per_jiffy */
 #include <linux/sched.h>
-#include <linux/smp_lock.h>     /* cycle_kernel_lock() */
+#include <linux/mutex.h>
 #include <asm/io.h>             /* for inb_p, outb_p, inb, outb, etc. */
 #include <asm/uaccess.h>        /* for get_user, etc. */
 #include <linux/wait.h>         /* for wait_queue */
@@ -73,6 +73,7 @@
 #define TRACE_RET ((void) 0)
 #endif                          /* TRACING */
 
+static DEFINE_MUTEX(dtlk_mutex);
 static void dtlk_timer_tick(unsigned long data);
 
 static int dtlk_major;
@@ -275,9 +276,9 @@ static long dtlk_ioctl(struct file *file,
         switch (cmd) {
 
         case DTLK_INTERROGATE:
-                lock_kernel();
+                mutex_lock(&dtlk_mutex);
                 sp = dtlk_interrogate();
-                unlock_kernel();
+                mutex_unlock(&dtlk_mutex);
                 if (copy_to_user(argp, sp, sizeof(struct dtlk_settings)))
                         return -EINVAL;
                 return 0;
@@ -296,7 +297,6 @@ static int dtlk_open(struct inode *inode, struct file *file)
 {
         TRACE_TEXT("(dtlk_open");
 
-        cycle_kernel_lock();
         nonseekable_open(inode, file);
         switch (iminor(inode)) {
         case DTLK_MINOR:
diff --git a/drivers/char/generic_nvram.c b/drivers/char/generic_nvram.c
index 82b5a88a82d7..0e941b57482e 100644
--- a/drivers/char/generic_nvram.c
+++ b/drivers/char/generic_nvram.c
@@ -19,7 +19,7 @@
 #include <linux/miscdevice.h>
 #include <linux/fcntl.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 #include <asm/nvram.h>
 #ifdef CONFIG_PPC_PMAC
@@ -28,6 +28,7 @@
 
 #define NVRAM_SIZE      8192
 
+static DEFINE_MUTEX(nvram_mutex);
 static ssize_t nvram_len;
 
 static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
@@ -120,9 +121,9 @@ static long nvram_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned l
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&nvram_mutex);
         ret = nvram_ioctl(file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&nvram_mutex);
 
         return ret;
 }
diff --git a/drivers/char/genrtc.c b/drivers/char/genrtc.c
index b6c2cc167c11..2aa69f97360d 100644
--- a/drivers/char/genrtc.c
+++ b/drivers/char/genrtc.c
@@ -52,7 +52,7 @@
 #include <linux/init.h>
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/workqueue.h>
 
 #include <asm/uaccess.h>
@@ -66,6 +66,7 @@
  *      ioctls.
  */
 
+static DEFINE_MUTEX(gen_rtc_mutex);
 static DECLARE_WAIT_QUEUE_HEAD(gen_rtc_wait);
 
 /*
@@ -337,9 +338,9 @@ static long gen_rtc_unlocked_ioctl(struct file *file, unsigned int cmd,
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&gen_rtc_mutex);
         ret = gen_rtc_ioctl(file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&gen_rtc_mutex);
 
         return ret;
 }
@@ -352,16 +353,16 @@ static long gen_rtc_unlocked_ioctl(struct file *file, unsigned int cmd,
 
 static int gen_rtc_open(struct inode *inode, struct file *file)
 {
-        lock_kernel();
+        mutex_lock(&gen_rtc_mutex);
         if (gen_rtc_status & RTC_IS_OPEN) {
-                unlock_kernel();
+                mutex_unlock(&gen_rtc_mutex);
                 return -EBUSY;
         }
 
         gen_rtc_status |= RTC_IS_OPEN;
         gen_rtc_irq_data = 0;
         irq_active = 0;
-        unlock_kernel();
+        mutex_unlock(&gen_rtc_mutex);
 
         return 0;
 }
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index 4cd8b227c11f..3bc0eef88717 100644
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -23,7 +23,7 @@
 #include <linux/seq_file.h>
 #include <linux/dmi.h>
 #include <linux/capability.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 
@@ -56,6 +56,7 @@
 
 #define I8K_TEMPERATURE_BUG     1
 
+static DEFINE_MUTEX(i8k_mutex);
 static char bios_version[4];
 
 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
@@ -399,9 +400,9 @@ static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 {
         long ret;
 
-        lock_kernel();
+        mutex_lock(&i8k_mutex);
         ret = i8k_ioctl_unlocked(fp, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&i8k_mutex);
 
         return ret;
 }
diff --git a/drivers/char/ip2/ip2main.c b/drivers/char/ip2/ip2main.c
index d4b71e8d0d23..dfbdf49d1e80 100644
--- a/drivers/char/ip2/ip2main.c
+++ b/drivers/char/ip2/ip2main.c
@@ -98,7 +98,7 @@
 #include <linux/major.h>
 #include <linux/wait.h>
 #include <linux/device.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/firmware.h>
 #include <linux/platform_device.h>
 
@@ -138,6 +138,7 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 
+static DEFINE_MUTEX(ip2_mutex);
 static const struct file_operations ip2mem_proc_fops;
 static const struct file_operations ip2_proc_fops;
 
@@ -2897,7 +2898,7 @@ ip2_ipl_ioctl (struct file *pFile, UINT cmd, ULONG arg )
         printk (KERN_DEBUG "IP2IPL: ioctl cmd %d, arg %ld\n", cmd, arg );
 #endif
 
-        lock_kernel();
+        mutex_lock(&ip2_mutex);
 
         switch ( iplminor ) {
         case 0:     // IPL device
@@ -2961,7 +2962,7 @@ ip2_ipl_ioctl (struct file *pFile, UINT cmd, ULONG arg )
                 rc = -ENODEV;
                 break;
         }
-        unlock_kernel();
+        mutex_unlock(&ip2_mutex);
         return rc;
 }
 
@@ -2982,7 +2983,6 @@ ip2_ipl_open( struct inode *pInode, struct file *pFile )
 #ifdef IP2DEBUG_IPL
         printk (KERN_DEBUG "IP2IPL: open\n" );
 #endif
-        cycle_kernel_lock();
         return 0;
 }
 
diff --git a/drivers/char/ipmi/ipmi_devintf.c b/drivers/char/ipmi/ipmi_devintf.c
index d8ec92a38980..44833de47728 100644
--- a/drivers/char/ipmi/ipmi_devintf.c
+++ b/drivers/char/ipmi/ipmi_devintf.c
@@ -44,7 +44,6 @@
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/compat.h>
-#include <linux/smp_lock.h>
 
 struct ipmi_file_private
 {
@@ -59,6 +58,7 @@ struct ipmi_file_private
         unsigned int         default_retry_time_ms;
 };
 
+static DEFINE_MUTEX(ipmi_mutex);
 static void file_receive_handler(struct ipmi_recv_msg *msg,
                                  void                 *handler_data)
 {
@@ -102,9 +102,9 @@ static int ipmi_fasync(int fd, struct file *file, int on)
         struct ipmi_file_private *priv = file->private_data;
         int                      result;
 
-        lock_kernel(); /* could race against open() otherwise */
+        mutex_lock(&ipmi_mutex); /* could race against open() otherwise */
         result = fasync_helper(fd, file, on, &priv->fasync_queue);
-        unlock_kernel();
+        mutex_unlock(&ipmi_mutex);
 
         return (result);
 }
@@ -125,7 +125,7 @@ static int ipmi_open(struct inode *inode, struct file *file)
         if (!priv)
                 return -ENOMEM;
 
-        lock_kernel();
+        mutex_lock(&ipmi_mutex);
         priv->file = file;
 
         rv = ipmi_create_user(if_num,
@@ -150,7 +150,7 @@ static int ipmi_open(struct inode *inode, struct file *file)
         priv->default_retry_time_ms = 0;
 
 out:
-        unlock_kernel();
+        mutex_unlock(&ipmi_mutex);
         return rv;
 }
 
@@ -639,9 +639,9 @@ static long ipmi_unlocked_ioctl(struct file   *file,
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&ipmi_mutex);
         ret = ipmi_ioctl(file, cmd, data);
-        unlock_kernel();
+        mutex_unlock(&ipmi_mutex);
 
         return ret;
 }
diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 654d566ca57c..ed10b741962d 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -35,7 +35,7 @@
 #include <linux/moduleparam.h>
 #include <linux/ipmi.h>
 #include <linux/ipmi_smi.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/watchdog.h>
 #include <linux/miscdevice.h>
 #include <linux/init.h>
@@ -149,6 +149,7 @@
 #define WDIOC_GET_PRETIMEOUT     _IOW(WATCHDOG_IOCTL_BASE, 22, int)
 #endif
 
+static DEFINE_MUTEX(ipmi_watchdog_mutex);
 static int nowayout = WATCHDOG_NOWAYOUT;
 
 static ipmi_user_t watchdog_user;
@@ -748,9 +749,9 @@ static long ipmi_unlocked_ioctl(struct file *file,
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&ipmi_watchdog_mutex);
         ret = ipmi_ioctl(file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&ipmi_watchdog_mutex);
 
         return ret;
 }
@@ -844,7 +845,6 @@ static int ipmi_open(struct inode *ino, struct file *filep)
                 if (test_and_set_bit(0, &ipmi_wdog_open))
                         return -EBUSY;
 
-                cycle_kernel_lock();
 
                 /*
                  * Don't start the timer now, let it start on the
diff --git a/drivers/char/lp.c b/drivers/char/lp.c
index 938a3a273886..598d278db058 100644
--- a/drivers/char/lp.c
+++ b/drivers/char/lp.c
@@ -126,7 +126,7 @@
 #include <linux/device.h>
 #include <linux/wait.h>
 #include <linux/jiffies.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/compat.h>
 
 #include <linux/parport.h>
@@ -140,6 +140,7 @@
 /* if you have more than 8 printers, remember to increase LP_NO */
 #define LP_NO 8
 
+static DEFINE_MUTEX(lp_mutex);
 static struct lp_struct lp_table[LP_NO];
 
 static unsigned int lp_count = 0;
@@ -493,7 +494,7 @@ static int lp_open(struct inode * inode, struct file * file)
         unsigned int minor = iminor(inode);
         int ret = 0;
 
-        lock_kernel();
+        mutex_lock(&lp_mutex);
         if (minor >= LP_NO) {
                 ret = -ENXIO;
                 goto out;
@@ -554,7 +555,7 @@ static int lp_open(struct inode * inode, struct file * file)
         lp_release_parport (&lp_table[minor]);
         lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
 out:
-        unlock_kernel();
+        mutex_unlock(&lp_mutex);
         return ret;
 }
 
@@ -680,7 +681,7 @@ static long lp_ioctl(struct file *file, unsigned int cmd,
         int ret;
 
         minor = iminor(file->f_path.dentry->d_inode);
-        lock_kernel();
+        mutex_lock(&lp_mutex);
         switch (cmd) {
         case LPSETTIMEOUT:
                 if (copy_from_user(&par_timeout, (void __user *)arg,
@@ -694,7 +695,7 @@ static long lp_ioctl(struct file *file, unsigned int cmd,
                 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
                 break;
         }
-        unlock_kernel();
+        mutex_unlock(&lp_mutex);
 
         return ret;
 }
@@ -709,7 +710,7 @@ static long lp_compat_ioctl(struct file *file, unsigned int cmd,
         int ret;
 
         minor = iminor(file->f_path.dentry->d_inode);
-        lock_kernel();
+        mutex_lock(&lp_mutex);
         switch (cmd) {
         case LPSETTIMEOUT:
                 tc = compat_ptr(arg);
@@ -730,7 +731,7 @@ static long lp_compat_ioctl(struct file *file, unsigned int cmd,
                 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
                 break;
         }
-        unlock_kernel();
+        mutex_unlock(&lp_mutex);
 
         return ret;
 }
diff --git a/drivers/char/mbcs.c b/drivers/char/mbcs.c
index 83bef4efe376..1aeaaba680d2 100644
--- a/drivers/char/mbcs.c
+++ b/drivers/char/mbcs.c
@@ -25,7 +25,6 @@
 #include <linux/mm.h>
 #include <linux/uio.h>
 #include <linux/mutex.h>
-#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
@@ -42,6 +41,7 @@
 #else
 #define DBG(fmt...)
 #endif
+static DEFINE_MUTEX(mbcs_mutex);
 static int mbcs_major;
 
 static LIST_HEAD(soft_list);
@@ -385,19 +385,19 @@ static int mbcs_open(struct inode *ip, struct file *fp)
         struct mbcs_soft *soft;
         int minor;
 
-        lock_kernel();
+        mutex_lock(&mbcs_mutex);
         minor = iminor(ip);
 
         /* Nothing protects access to this list... */
         list_for_each_entry(soft, &soft_list, list) {
                 if (soft->nasid == minor) {
                         fp->private_data = soft->cxdev;
-                        unlock_kernel();
+                        mutex_unlock(&mbcs_mutex);
                         return 0;
                 }
         }
 
-        unlock_kernel();
+        mutex_unlock(&mbcs_mutex);
         return -ENODEV;
 }
 
diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c
index ea7c99fa978f..fe4697844ec1 100644
--- a/drivers/char/mmtimer.c
+++ b/drivers/char/mmtimer.c
@@ -32,7 +32,7 @@
 #include <linux/interrupt.h>
 #include <linux/time.h>
 #include <linux/math64.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/slab.h>
 
 #include <asm/uaccess.h>
@@ -59,6 +59,7 @@ extern unsigned long sn_rtc_cycles_per_second;
 
 #define rtc_time()              (*RTC_COUNTER_ADDR)
 
+static DEFINE_MUTEX(mmtimer_mutex);
 static long mmtimer_ioctl(struct file *file, unsigned int cmd,
                                                 unsigned long arg);
 static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma);
@@ -371,7 +372,7 @@ static long mmtimer_ioctl(struct file *file, unsigned int cmd,
 {
         int ret = 0;
 
-        lock_kernel();
+        mutex_lock(&mmtimer_mutex);
 
         switch (cmd) {
         case MMTIMER_GETOFFSET: /* offset of the counter */
@@ -414,7 +415,7 @@ static long mmtimer_ioctl(struct file *file, unsigned int cmd,
                 ret = -ENOTTY;
                 break;
         }
-        unlock_kernel();
+        mutex_unlock(&mmtimer_mutex);
         return ret;
 }
 
diff --git a/drivers/char/mwave/mwavedd.c b/drivers/char/mwave/mwavedd.c
index a4ec50c95072..e5df26b56d59 100644
--- a/drivers/char/mwave/mwavedd.c
+++ b/drivers/char/mwave/mwavedd.c
@@ -56,7 +56,7 @@
 #include <linux/serial.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/delay.h>
 #include <linux/serial_8250.h>
 #include "smapi.h"
@@ -73,6 +73,7 @@ MODULE_LICENSE("GPL");
 * checks are made against other devices (ie. superio) for conflicts.
 * We'll depend on users using the tpctl utility to do that for now
 */
+static DEFINE_MUTEX(mwave_mutex);
 int mwave_debug = 0;
 int mwave_3780i_irq = 0;
 int mwave_3780i_io = 0;
@@ -101,7 +102,6 @@ static int mwave_open(struct inode *inode, struct file *file)
         PRINTK_2(TRACE_MWAVE,
                 "mwavedd::mwave_open, exit return retval %x\n", retval);
 
-        cycle_kernel_lock();
         return retval;
 }
 
@@ -136,9 +136,9 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                         PRINTK_1(TRACE_MWAVE,
                                 "mwavedd::mwave_ioctl, IOCTL_MW_RESET"
                                 " calling tp3780I_ResetDSP\n");
-                        lock_kernel();
+                        mutex_lock(&mwave_mutex);
                         retval = tp3780I_ResetDSP(&pDrvData->rBDData);
-                        unlock_kernel();
+                        mutex_unlock(&mwave_mutex);
                         PRINTK_2(TRACE_MWAVE,
                                 "mwavedd::mwave_ioctl, IOCTL_MW_RESET"
                                 " retval %x from tp3780I_ResetDSP\n",
@@ -149,9 +149,9 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                         PRINTK_1(TRACE_MWAVE,
                                 "mwavedd::mwave_ioctl, IOCTL_MW_RUN"
                                 " calling tp3780I_StartDSP\n");
-                        lock_kernel();
+                        mutex_lock(&mwave_mutex);
                         retval = tp3780I_StartDSP(&pDrvData->rBDData);
-                        unlock_kernel();
+                        mutex_unlock(&mwave_mutex);
                         PRINTK_2(TRACE_MWAVE,
                                 "mwavedd::mwave_ioctl, IOCTL_MW_RUN"
                                 " retval %x from tp3780I_StartDSP\n",
@@ -165,10 +165,10 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                                 "mwavedd::mwave_ioctl,"
                                 " IOCTL_MW_DSP_ABILITIES calling"
                                 " tp3780I_QueryAbilities\n");
-                        lock_kernel();
+                        mutex_lock(&mwave_mutex);
                         retval = tp3780I_QueryAbilities(&pDrvData->rBDData,
                                         &rAbilities);
-                        unlock_kernel();
+                        mutex_unlock(&mwave_mutex);
                         PRINTK_2(TRACE_MWAVE,
                                 "mwavedd::mwave_ioctl, IOCTL_MW_DSP_ABILITIES"
                                 " retval %x from tp3780I_QueryAbilities\n",
@@ -199,13 +199,13 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                                 "mwavedd::mwave_ioctl IOCTL_MW_READ_DATA,"
                                 " size %lx, ioarg %lx pusBuffer %p\n",
                                 rReadData.ulDataLength, ioarg, pusBuffer);
-                        lock_kernel();
+                        mutex_lock(&mwave_mutex);
                         retval = tp3780I_ReadWriteDspDStore(&pDrvData->rBDData,
                                         iocmd,
                                         pusBuffer,
                                         rReadData.ulDataLength,
                                         rReadData.usDspAddress);
-                        unlock_kernel();
+                        mutex_unlock(&mwave_mutex);
                 }
                         break;
         
@@ -223,12 +223,12 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                                 " size %lx, ioarg %lx pusBuffer %p\n",
                                 rReadData.ulDataLength / 2, ioarg,
                                 pusBuffer);
-                        lock_kernel();
+                        mutex_lock(&mwave_mutex);
                         retval = tp3780I_ReadWriteDspDStore(&pDrvData->rBDData,
                                 iocmd, pusBuffer,
                                 rReadData.ulDataLength / 2,
                                 rReadData.usDspAddress);
-                        unlock_kernel();
+                        mutex_unlock(&mwave_mutex);
                 }
                         break;
         
@@ -246,12 +246,12 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                                 " size %lx, ioarg %lx pusBuffer %p\n",
                                 rWriteData.ulDataLength, ioarg,
                                 pusBuffer);
-                        lock_kernel();
+                        mutex_lock(&mwave_mutex);
                         retval = tp3780I_ReadWriteDspDStore(&pDrvData->rBDData,
                                         iocmd, pusBuffer,
                                         rWriteData.ulDataLength,
                                         rWriteData.usDspAddress);
-                        unlock_kernel();
+                        mutex_unlock(&mwave_mutex);
                 }
                         break;
         
@@ -269,12 +269,12 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                                 " size %lx, ioarg %lx pusBuffer %p\n",
                                 rWriteData.ulDataLength, ioarg,
                                 pusBuffer);
-                        lock_kernel();
+                        mutex_lock(&mwave_mutex);
                         retval = tp3780I_ReadWriteDspIStore(&pDrvData->rBDData,
                                         iocmd, pusBuffer,
                                         rWriteData.ulDataLength,
                                         rWriteData.usDspAddress);
-                        unlock_kernel();
+                        mutex_unlock(&mwave_mutex);
                 }
                         break;
         
@@ -295,10 +295,10 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                                 ipcnum,
                                 pDrvData->IPCs[ipcnum].usIntCount);
 
-                        lock_kernel();
+                        mutex_lock(&mwave_mutex);
                         pDrvData->IPCs[ipcnum].bIsHere = FALSE;
                         pDrvData->IPCs[ipcnum].bIsEnabled = TRUE;
-                        unlock_kernel();
+                        mutex_unlock(&mwave_mutex);
         
                         PRINTK_2(TRACE_MWAVE,
                                 "mwavedd::mwave_ioctl IOCTL_MW_REGISTER_IPC"
@@ -323,7 +323,7 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                                 ipcnum,
                                 pDrvData->IPCs[ipcnum].usIntCount);
         
-                        lock_kernel();
+                        mutex_lock(&mwave_mutex);
                         if (pDrvData->IPCs[ipcnum].bIsEnabled == TRUE) {
                                 DECLARE_WAITQUEUE(wait, current);
 
@@ -364,7 +364,7 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                                         " processing\n",
                                         ipcnum);
                         }
-                        unlock_kernel();
+                        mutex_unlock(&mwave_mutex);
                 }
                         break;
         
@@ -383,14 +383,14 @@ static long mwave_ioctl(struct file *file, unsigned int iocmd,
                                                 ipcnum);
                                 return -EINVAL;
                         }
-                        lock_kernel();
+                        mutex_lock(&mwave_mutex);
                         if (pDrvData->IPCs[ipcnum].bIsEnabled == TRUE) {
                                 pDrvData->IPCs[ipcnum].bIsEnabled = FALSE;
                                 if (pDrvData->IPCs[ipcnum].bIsHere == TRUE) {
                                         wake_up_interruptible(&pDrvData->IPCs[ipcnum].ipc_wait_queue);
                                 }
                         }
-                        unlock_kernel();
+                        mutex_unlock(&mwave_mutex);
                 }
                         break;
         
diff --git a/drivers/char/nvram.c b/drivers/char/nvram.c
index 66d2917b003f..166f1e7aaa7e 100644
--- a/drivers/char/nvram.c
+++ b/drivers/char/nvram.c
@@ -109,10 +109,11 @@
 #include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/uaccess.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include <asm/system.h>
 
+static DEFINE_MUTEX(nvram_mutex);
 static DEFINE_SPINLOCK(nvram_state_lock);
 static int nvram_open_cnt;      /* #times opened */
 static int nvram_open_mode;     /* special open modes */
@@ -308,7 +309,7 @@ static long nvram_ioctl(struct file *file, unsigned int cmd,
                 if (!capable(CAP_SYS_ADMIN))
                         return -EACCES;
 
-                lock_kernel();
+                mutex_lock(&nvram_mutex);
                 spin_lock_irq(&rtc_lock);
 
                 for (i = 0; i < NVRAM_BYTES; ++i)
@@ -316,7 +317,7 @@ static long nvram_ioctl(struct file *file, unsigned int cmd,
                 __nvram_set_checksum();
 
                 spin_unlock_irq(&rtc_lock);
-                unlock_kernel();
+                mutex_unlock(&nvram_mutex);
                 return 0;
 
         case NVRAM_SETCKS:
@@ -325,11 +326,11 @@ static long nvram_ioctl(struct file *file, unsigned int cmd,
                 if (!capable(CAP_SYS_ADMIN))
                         return -EACCES;
 
-                lock_kernel();
+                mutex_lock(&nvram_mutex);
                 spin_lock_irq(&rtc_lock);
                 __nvram_set_checksum();
                 spin_unlock_irq(&rtc_lock);
-                unlock_kernel();
+                mutex_unlock(&nvram_mutex);
                 return 0;
 
         default:
diff --git a/drivers/char/nwflash.c b/drivers/char/nwflash.c
index 043a1c7b86be..a12f52400dbc 100644
--- a/drivers/char/nwflash.c
+++ b/drivers/char/nwflash.c
@@ -25,7 +25,6 @@
 #include <linux/spinlock.h>
 #include <linux/rwsem.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
 #include <linux/mutex.h>
 #include <linux/jiffies.h>
 
@@ -41,6 +40,7 @@
 
 #define NWFLASH_VERSION "6.4"
 
+static DEFINE_MUTEX(flash_mutex);
 static void kick_open(void);
 static int get_flash_id(void);
 static int erase_block(int nBlock);
@@ -96,7 +96,7 @@ static int get_flash_id(void)
 
 static long flash_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 {
-        lock_kernel();
+        mutex_lock(&flash_mutex);
         switch (cmd) {
         case CMD_WRITE_DISABLE:
                 gbWriteBase64Enable = 0;
@@ -114,10 +114,10 @@ static long flash_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
         default:
                 gbWriteBase64Enable = 0;
                 gbWriteEnable = 0;
-                unlock_kernel();
+                mutex_unlock(&flash_mutex);
                 return -EINVAL;
         }
-        unlock_kernel();
+        mutex_unlock(&flash_mutex);
         return 0;
 }
 
@@ -282,7 +282,7 @@ static loff_t flash_llseek(struct file *file, loff_t offset, int orig)
 {
         loff_t ret;
 
-        lock_kernel();
+        mutex_lock(&flash_mutex);
         if (flashdebug)
                 printk(KERN_DEBUG "flash_llseek: offset=0x%X, orig=0x%X.\n",
                        (unsigned int) offset, orig);
@@ -317,7 +317,7 @@ static loff_t flash_llseek(struct file *file, loff_t offset, int orig)
         default:
                 ret = -EINVAL;
         }
-        unlock_kernel();
+        mutex_unlock(&flash_mutex);
         return ret;
 }
 
diff --git a/drivers/char/pcmcia/cm4000_cs.c b/drivers/char/pcmcia/cm4000_cs.c
index c7b482d15e2a..c4e52ec85c6e 100644
--- a/drivers/char/pcmcia/cm4000_cs.c
+++ b/drivers/char/pcmcia/cm4000_cs.c
@@ -30,7 +30,7 @@
 #include <linux/fs.h>
 #include <linux/delay.h>
 #include <linux/bitrev.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
 
@@ -54,6 +54,8 @@
                            __func__ , ## args);         \
         } while (0)
 
+static DEFINE_MUTEX(cmm_mutex);
+
 #define T_1SEC          (HZ)
 #define T_10MSEC        msecs_to_jiffies(10)
 #define T_20MSEC        msecs_to_jiffies(20)
@@ -1415,7 +1417,7 @@ static long cmm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                iminor(inode), ioctl_names[_IOC_NR(cmd)]);
 #endif
 
-        lock_kernel();
+        mutex_lock(&cmm_mutex);
         rc = -ENODEV;
         link = dev_table[iminor(inode)];
         if (!pcmcia_dev_present(link)) {
@@ -1623,7 +1625,7 @@ static long cmm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                 rc = -ENOTTY;
         }
 out:
-        unlock_kernel();
+        mutex_unlock(&cmm_mutex);
         return rc;
 }
 
@@ -1637,7 +1639,7 @@ static int cmm_open(struct inode *inode, struct file *filp)
         if (minor >= CM4000_MAX_DEV)
                 return -ENODEV;
 
-        lock_kernel();
+        mutex_lock(&cmm_mutex);
         link = dev_table[minor];
         if (link == NULL || !pcmcia_dev_present(link)) {
                 ret = -ENODEV;
@@ -1682,7 +1684,7 @@ static int cmm_open(struct inode *inode, struct file *filp)
         DEBUGP(2, dev, "<- cmm_open\n");
         ret = nonseekable_open(inode, filp);
 out:
-        unlock_kernel();
+        mutex_unlock(&cmm_mutex);
         return ret;
 }
 
diff --git a/drivers/char/pcmcia/cm4040_cs.c b/drivers/char/pcmcia/cm4040_cs.c
index bf2f046fc2c1..d7c32cb40ca3 100644
--- a/drivers/char/pcmcia/cm4040_cs.c
+++ b/drivers/char/pcmcia/cm4040_cs.c
@@ -24,7 +24,7 @@
 #include <linux/fs.h>
 #include <linux/delay.h>
 #include <linux/poll.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/wait.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -48,6 +48,8 @@
                            __func__ , ## args);         \
         } while (0)
 
+static DEFINE_MUTEX(cm4040_mutex);
+
 #define CCID_DRIVER_BULK_DEFAULT_TIMEOUT        (150*HZ)
 #define CCID_DRIVER_ASYNC_POWERUP_TIMEOUT       (35*HZ)
 #define CCID_DRIVER_MINIMUM_TIMEOUT             (3*HZ)
@@ -440,7 +442,7 @@ static int cm4040_open(struct inode *inode, struct file *filp)
         if (minor >= CM_MAX_DEV)
                 return -ENODEV;
 
-        lock_kernel();
+        mutex_lock(&cm4040_mutex);
         link = dev_table[minor];
         if (link == NULL || !pcmcia_dev_present(link)) {
                 ret = -ENODEV;
@@ -469,7 +471,7 @@ static int cm4040_open(struct inode *inode, struct file *filp)
         DEBUGP(2, dev, "<- cm4040_open (successfully)\n");
         ret = nonseekable_open(inode, filp);
 out:
-        unlock_kernel();
+        mutex_unlock(&cm4040_mutex);
         return ret;
 }
 
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index 02abfddce45a..723152d978a9 100644
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -67,7 +67,7 @@
 #include <linux/slab.h>
 #include <linux/major.h>
 #include <linux/ppdev.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/uaccess.h>
 
 #define PP_VERSION "ppdev: user-space parallel port driver"
@@ -97,6 +97,7 @@ struct pp_struct {
 /* ROUND_UP macro from fs/select.c */
 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
 
+static DEFINE_MUTEX(pp_do_mutex);
 static inline void pp_enable_irq (struct pp_struct *pp)
 {
         struct parport *port = pp->pdev->port;
@@ -630,9 +631,9 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
         long ret;
-        lock_kernel();
+        mutex_lock(&pp_do_mutex);
         ret = pp_do_ioctl(file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&pp_do_mutex);
         return ret;
 }
 
@@ -641,7 +642,6 @@ static int pp_open (struct inode * inode, struct file * file)
         unsigned int minor = iminor(inode);
         struct pp_struct *pp;
 
-        cycle_kernel_lock();
         if (minor >= PARPORT_MAX)
                 return -ENXIO;
 
diff --git a/drivers/char/rio/rio_linux.c b/drivers/char/rio/rio_linux.c
index d58c2eb07f07..e06a5977fdb2 100644
--- a/drivers/char/rio/rio_linux.c
+++ b/drivers/char/rio/rio_linux.c
@@ -44,7 +44,7 @@
 #include <linux/delay.h>
 #include <linux/pci.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/miscdevice.h>
 #include <linux/init.h>
 
@@ -122,6 +122,7 @@ more than 512 ports.... */
 
 
 /* These constants are derived from SCO Source */
+static DEFINE_MUTEX(rio_fw_mutex);
 static struct Conf
  RIOConf = {
         /* locator */ "RIO Config here",
@@ -566,9 +567,9 @@ static long rio_fw_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
         func_enter();
 
         /* The "dev" argument isn't used. */
-        lock_kernel();
+        mutex_lock(&rio_fw_mutex);
         rc = riocontrol(p, 0, cmd, arg, capable(CAP_SYS_ADMIN));
-        unlock_kernel();
+        mutex_unlock(&rio_fw_mutex);
 
         func_exit();
         return rc;
diff --git a/drivers/char/snsc.c b/drivers/char/snsc.c
index 32b74de18f5f..208e25731dfe 100644
--- a/drivers/char/snsc.c
+++ b/drivers/char/snsc.c
@@ -21,7 +21,7 @@
 #include <linux/poll.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/sn/io.h>
 #include <asm/sn/sn_sal.h>
 #include <asm/sn/module.h>
@@ -34,6 +34,7 @@
 #define SCDRV_BUFSZ     2048
 #define SCDRV_TIMEOUT   1000
 
+static DEFINE_MUTEX(scdrv_mutex);
 static irqreturn_t
 scdrv_interrupt(int irq, void *subch_data)
 {
@@ -105,7 +106,7 @@ scdrv_open(struct inode *inode, struct file *file)
         file->private_data = sd;
 
         /* hook this subchannel up to the system controller interrupt */
-        lock_kernel();
+        mutex_lock(&scdrv_mutex);
         rv = request_irq(SGI_UART_VECTOR, scdrv_interrupt,
                          IRQF_SHARED | IRQF_DISABLED,
                          SYSCTL_BASENAME, sd);
@@ -113,10 +114,10 @@ scdrv_open(struct inode *inode, struct file *file)
                 ia64_sn_irtr_close(sd->sd_nasid, sd->sd_subch);
                 kfree(sd);
                 printk("%s: irq request failed (%d)\n", __func__, rv);
-                unlock_kernel();
+                mutex_unlock(&scdrv_mutex);
                 return -EBUSY;
         }
-        unlock_kernel();
+        mutex_unlock(&scdrv_mutex);
         return 0;
 }
 
diff --git a/drivers/char/toshiba.c b/drivers/char/toshiba.c
index f8bc79f6de34..f8f09ab0b170 100644
--- a/drivers/char/toshiba.c
+++ b/drivers/char/toshiba.c
@@ -68,7 +68,7 @@
 #include <linux/stat.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/toshiba.h>
 
 #define TOSH_MINOR_DEV 181
@@ -78,6 +78,7 @@ MODULE_AUTHOR("Jonathan Buzzard <jonathan@buzzard.org.uk>");
 MODULE_DESCRIPTION("Toshiba laptop SMM driver");
 MODULE_SUPPORTED_DEVICE("toshiba");
 
+static DEFINE_MUTEX(tosh_mutex);
 static int tosh_fn;
 module_param_named(fn, tosh_fn, int, 0);
 MODULE_PARM_DESC(fn, "User specified Fn key detection port");
@@ -274,16 +275,16 @@ static long tosh_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
                                 return -EINVAL;
 
                         /* do we need to emulate the fan ? */
-                        lock_kernel();
+                        mutex_lock(&tosh_mutex);
                         if (tosh_fan==1) {
                                 if (((ax==0xf300) || (ax==0xf400)) && (bx==0x0004)) {
                                         err = tosh_emulate_fan(&regs);
-                                        unlock_kernel();
+                                        mutex_unlock(&tosh_mutex);
                                         break;
                                 }
                         }
                         err = tosh_smm(&regs);
-                        unlock_kernel();
+                        mutex_unlock(&tosh_mutex);
                         break;
                 default:
                         return -EINVAL;
diff --git a/drivers/char/viotape.c b/drivers/char/viotape.c
index 42f7fa442ff8..6f954a808b65 100644
--- a/drivers/char/viotape.c
+++ b/drivers/char/viotape.c
@@ -46,7 +46,7 @@
 #include <linux/completion.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/slab.h>
 
 #include <asm/uaccess.h>
@@ -64,6 +64,7 @@
 #define VIOTAPE_KERN_WARN       KERN_WARNING "viotape: "
 #define VIOTAPE_KERN_INFO       KERN_INFO "viotape: "
 
+static DEFINE_MUTEX(proc_viotape_mutex);
 static int viotape_numdev;
 
 /*
@@ -684,9 +685,9 @@ static long viotap_unlocked_ioctl(struct file *file,
 {
         long rc;
 
-        lock_kernel();
+        mutex_lock(&proc_viotape_mutex);
         rc = viotap_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&proc_viotape_mutex);
         return rc;
 }
 
@@ -700,7 +701,7 @@ static int viotap_open(struct inode *inode, struct file *file)
         if (op == NULL)
                 return -ENOMEM;
 
-        lock_kernel();
+        mutex_lock(&proc_viotape_mutex);
         get_dev_info(file->f_path.dentry->d_inode, &devi);
 
         /* Note: We currently only support one mode! */
@@ -731,7 +732,7 @@ static int viotap_open(struct inode *inode, struct file *file)
 
 free_op:
         free_op_struct(op);
-        unlock_kernel();
+        mutex_unlock(&proc_viotape_mutex);
         return ret;
 }
 
diff --git a/drivers/char/xilinx_hwicap/xilinx_hwicap.c b/drivers/char/xilinx_hwicap/xilinx_hwicap.c
index b663d573aad9..d985204d76fe 100644
--- a/drivers/char/xilinx_hwicap/xilinx_hwicap.c
+++ b/drivers/char/xilinx_hwicap/xilinx_hwicap.c
@@ -81,7 +81,6 @@
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
 #include <linux/mutex.h>
-#include <linux/smp_lock.h>
 #include <linux/sysctl.h>
 #include <linux/fs.h>
 #include <linux/cdev.h>
@@ -112,6 +111,7 @@
 #define HWICAP_DEVICES 1
 
 /* An array, which is set to true when the device is registered. */
+static DEFINE_MUTEX(hwicap_mutex);
 static bool probed_devices[HWICAP_DEVICES];
 static struct mutex icap_sem;
 
@@ -502,7 +502,7 @@ static int hwicap_open(struct inode *inode, struct file *file)
         struct hwicap_drvdata *drvdata;
         int status;
 
-        lock_kernel();
+        mutex_lock(&hwicap_mutex);
         drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev);
 
         status = mutex_lock_interruptible(&drvdata->sem);
@@ -528,7 +528,7 @@ static int hwicap_open(struct inode *inode, struct file *file)
  error:
         mutex_unlock(&drvdata->sem);
  out:
-        unlock_kernel();
+        mutex_unlock(&hwicap_mutex);
         return status;
 }