drivers: autoconvert trivial BKL users to private mutex

All these files use the big kernel lock in a trivial
way to serialize their private file operations,
typically resulting from an earlier semi-automatic
pushdown from VFS.

None of these drivers appears to want to lock against
other code, and they all use the BKL as the top-level
lock in their file operations, meaning that there
is no lock-order inversion problem.

Consequently, we can remove the BKL completely,
replacing it with a per-file mutex in every case.
Using a scripted approach means we can avoid
typos.

These drivers do not seem to be under active
maintainance from my brief investigation. Apologies
to those maintainers that I have missed.

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>

35 files changed, 216 insertions, 190 deletions

diff --git a/drivers/block/paride/pg.c b/drivers/block/paride/pg.c
index c397b3ddba9..bed29cb9e6d 100644
--- a/drivers/block/paride/pg.c
+++ b/drivers/block/paride/pg.c
@@ -162,7 +162,7 @@ enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
 #include <linux/pg.h>
 #include <linux/device.h>
 #include <linux/sched.h>	/* current, TASK_* */
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/jiffies.h>
 
 #include <asm/uaccess.h>
@@ -193,6 +193,7 @@ module_param_array(drive3, int, NULL, 0);
 
 #define ATAPI_IDENTIFY		0x12
 
+static DEFINE_MUTEX(pg_mutex);
 static int pg_open(struct inode *inode, struct file *file);
 static int pg_release(struct inode *inode, struct file *file);
 static ssize_t pg_read(struct file *filp, char __user *buf,
@@ -518,7 +519,7 @@ static int pg_open(struct inode *inode, struct file *file)
 	struct pg *dev = &devices[unit];
 	int ret = 0;
 
-	lock_kernel();
+	mutex_lock(&pg_mutex);
 	if ((unit >= PG_UNITS) || (!dev->present)) {
 		ret = -ENODEV;
 		goto out;
@@ -547,7 +548,7 @@ static int pg_open(struct inode *inode, struct file *file)
 	file->private_data = dev;
 
 out:
-	unlock_kernel();
+	mutex_unlock(&pg_mutex);
 	return ret;
 }
 
diff --git a/drivers/block/paride/pt.c b/drivers/block/paride/pt.c
index bc5825fdeaa..e4dda282e0a 100644
--- a/drivers/block/paride/pt.c
+++ b/drivers/block/paride/pt.c
@@ -146,7 +146,7 @@ static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
 #include <linux/mtio.h>
 #include <linux/device.h>
 #include <linux/sched.h>	/* current, TASK_*, schedule_timeout() */
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include <asm/uaccess.h>
 
@@ -189,6 +189,7 @@ module_param_array(drive3, int, NULL, 0);
 #define ATAPI_MODE_SENSE	0x1a
 #define ATAPI_LOG_SENSE		0x4d
 
+static DEFINE_MUTEX(pt_mutex);
 static int pt_open(struct inode *inode, struct file *file);
 static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 static int pt_release(struct inode *inode, struct file *file);
@@ -650,9 +651,9 @@ static int pt_open(struct inode *inode, struct file *file)
 	struct pt_unit *tape = pt + unit;
 	int err;
 
-	lock_kernel();
+	mutex_lock(&pt_mutex);
 	if (unit >= PT_UNITS || (!tape->present)) {
-		unlock_kernel();
+		mutex_unlock(&pt_mutex);
 		return -ENODEV;
 	}
 
@@ -681,12 +682,12 @@ static int pt_open(struct inode *inode, struct file *file)
 	}
 
 	file->private_data = tape;
-	unlock_kernel();
+	mutex_unlock(&pt_mutex);
 	return 0;
 
 out:
 	atomic_inc(&tape->available);
-	unlock_kernel();
+	mutex_unlock(&pt_mutex);
 	return err;
 }
 
@@ -704,15 +705,15 @@ static long pt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		switch (mtop.mt_op) {
 
 		case MTREW:
-			lock_kernel();
+			mutex_lock(&pt_mutex);
 			pt_rewind(tape);
-			unlock_kernel();
+			mutex_unlock(&pt_mutex);
 			return 0;
 
 		case MTWEOF:
-			lock_kernel();
+			mutex_lock(&pt_mutex);
 			pt_write_fm(tape);
-			unlock_kernel();
+			mutex_unlock(&pt_mutex);
 			return 0;
 
 		default:
diff --git a/drivers/char/apm-emulation.c b/drivers/char/apm-emulation.c
index 033e1505fca..6a420baea26 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 f4ae0e0fb63..e7ba774beda 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 170693c93c7..e3d72aa3cbd 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 dbee8688f75..9aa1fd059ae 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 8a1b28a10ef..b3c756227e3 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 e3859d4eaea..8dd040a945d 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 82b5a88a82d..0e941b57482 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 b6c2cc167c1..2aa69f97360 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 4cd8b227c11..3bc0eef8871 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 d4b71e8d0d2..dfbdf49d1e8 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/lp.c b/drivers/char/lp.c
index 938a3a27388..598d278db05 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 83bef4efe37..1aeaaba680d 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 ea7c99fa978..fe4697844ec 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 a4ec50c9507..e5df26b56d5 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");