isdn: 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.

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>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

9 files changed, 48 insertions, 46 deletions

diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 0cabe31f26d..b0a4a691cba 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -20,7 +20,6 @@
 #include <linux/signal.h>
 #include <linux/mutex.h>
 #include <linux/mm.h>
-#include <linux/smp_lock.h>
 #include <linux/timer.h>
 #include <linux/wait.h>
 #include <linux/tty.h>
@@ -50,6 +49,7 @@ MODULE_LICENSE("GPL");
 
 /* -------- driver information -------------------------------------- */
 
+static DEFINE_MUTEX(capi_mutex);
 static struct class *capi_class;
 static int capi_major = 68;             /* allocated */
 
@@ -985,9 +985,9 @@ capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&capi_mutex);
         ret = capi_ioctl(file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&capi_mutex);
 
         return ret;
 }
diff --git a/drivers/isdn/divert/divert_procfs.c b/drivers/isdn/divert/divert_procfs.c
index c53e2417e7d..33ec9e46777 100644
--- a/drivers/isdn/divert/divert_procfs.c
+++ b/drivers/isdn/divert/divert_procfs.c
@@ -20,7 +20,7 @@
 #include <linux/sched.h>
 #include <linux/isdnif.h>
 #include <net/net_namespace.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include "isdn_divert.h"
 
 
@@ -28,6 +28,7 @@
 /* Variables for interface queue */
 /*********************************/
 ulong if_used = 0;              /* number of interface users */
+static DEFINE_MUTEX(isdn_divert_mutex);
 static struct divert_info *divert_info_head = NULL;     /* head of queue */
 static struct divert_info *divert_info_tail = NULL;     /* pointer to last entry */
 static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
@@ -261,9 +262,9 @@ static long isdn_divert_ioctl(struct file *file, uint cmd, ulong arg)
 {
         long ret;
 
-        lock_kernel();
+        mutex_lock(&isdn_divert_mutex);
         ret = isdn_divert_ioctl_unlocked(file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&isdn_divert_mutex);
 
         return ret;
 }
diff --git a/drivers/isdn/hardware/eicon/divamnt.c b/drivers/isdn/hardware/eicon/divamnt.c
index 1e85f743214..f1d464f1e10 100644
--- a/drivers/isdn/hardware/eicon/divamnt.c
+++ b/drivers/isdn/hardware/eicon/divamnt.c
@@ -14,7 +14,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/poll.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <asm/uaccess.h>
 
 #include "platform.h"
@@ -22,6 +22,7 @@
 #include "divasync.h"
 #include "debug_if.h"
 
+static DEFINE_MUTEX(maint_mutex);
 static char *main_revision = "$Revision: 1.32.6.10 $";
 
 static int major;
@@ -130,7 +131,7 @@ static int maint_open(struct inode *ino, struct file *filep)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&maint_mutex);
         /* only one open is allowed, so we test
            it atomically */
         if (test_and_set_bit(0, &opened))
@@ -139,7 +140,7 @@ static int maint_open(struct inode *ino, struct file *filep)
                 filep->private_data = NULL;
                 ret = nonseekable_open(ino, filep);
         }
-        unlock_kernel();
+        mutex_unlock(&maint_mutex);
         return ret;
 }
 
diff --git a/drivers/isdn/hardware/eicon/divasi.c b/drivers/isdn/hardware/eicon/divasi.c
index f577719ab3f..42d3b834603 100644
--- a/drivers/isdn/hardware/eicon/divasi.c
+++ b/drivers/isdn/hardware/eicon/divasi.c
@@ -18,7 +18,6 @@
 #include <linux/proc_fs.h>
 #include <linux/skbuff.h>
 #include <linux/seq_file.h>
-#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 #include "platform.h"
@@ -402,7 +401,6 @@ static unsigned int um_idi_poll(struct file *file, poll_table * wait)
 
 static int um_idi_open(struct inode *inode, struct file *file)
 {
-        cycle_kernel_lock();
         return (0);
 }
 
diff --git a/drivers/isdn/hardware/eicon/divasmain.c b/drivers/isdn/hardware/eicon/divasmain.c
index fbbcb27fb68..16a874bb156 100644
--- a/drivers/isdn/hardware/eicon/divasmain.c
+++ b/drivers/isdn/hardware/eicon/divasmain.c
@@ -21,7 +21,6 @@
 #include <linux/list.h>
 #include <linux/poll.h>
 #include <linux/kmod.h>
-#include <linux/smp_lock.h>
 
 #include "platform.h"
 #undef ID_MASK
@@ -581,7 +580,6 @@ xdi_copy_from_user(void *os_handle, void *dst, const void __user *src, int lengt
  */
 static int divas_open(struct inode *inode, struct file *file)
 {
-        cycle_kernel_lock();
         return (0);
 }
 
diff --git a/drivers/isdn/hysdn/hysdn_procconf.c b/drivers/isdn/hysdn/hysdn_procconf.c
index 80966462d6d..96b3e39c335 100644
--- a/drivers/isdn/hysdn/hysdn_procconf.c
+++ b/drivers/isdn/hysdn/hysdn_procconf.c
@@ -17,11 +17,12 @@
 #include <linux/proc_fs.h>
 #include <linux/pci.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <net/net_namespace.h>
 
 #include "hysdn_defs.h"
 
+static DEFINE_MUTEX(hysdn_conf_mutex);
 static char *hysdn_procconf_revision = "$Revision: 1.8.6.4 $";
 
 #define INFO_OUT_LEN 80         /* length of info line including lf */
@@ -234,7 +235,7 @@ hysdn_conf_open(struct inode *ino, struct file *filep)
         char *cp, *tmp;
 
         /* now search the addressed card */
-        lock_kernel();
+        mutex_lock(&hysdn_conf_mutex);
         card = card_root;
         while (card) {
                 pd = card->procconf;
@@ -243,7 +244,7 @@ hysdn_conf_open(struct inode *ino, struct file *filep)
                 card = card->next;      /* search next entry */
         }
         if (!card) {
-                unlock_kernel();
+                mutex_unlock(&hysdn_conf_mutex);
                 return (-ENODEV);       /* device is unknown/invalid */
         }
         if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
@@ -255,7 +256,7 @@ hysdn_conf_open(struct inode *ino, struct file *filep)
                 /* write only access -> write boot file or conf line */
 
                 if (!(cnf = kmalloc(sizeof(struct conf_writedata), GFP_KERNEL))) {
-                        unlock_kernel();
+                        mutex_unlock(&hysdn_conf_mutex);
                         return (-EFAULT);
                 }
                 cnf->card = card;
@@ -267,7 +268,7 @@ hysdn_conf_open(struct inode *ino, struct file *filep)
                 /* read access -> output card info data */
 
                 if (!(tmp = kmalloc(INFO_OUT_LEN * 2 + 2, GFP_KERNEL))) {
-                        unlock_kernel();
+                        mutex_unlock(&hysdn_conf_mutex);
                         return (-EFAULT);       /* out of memory */
                 }
                 filep->private_data = tmp;      /* start of string */
@@ -301,10 +302,10 @@ hysdn_conf_open(struct inode *ino, struct file *filep)
                 *cp++ = '\n';
                 *cp = 0;        /* end of string */
         } else {                /* simultaneous read/write access forbidden ! */
-                unlock_kernel();
+                mutex_unlock(&hysdn_conf_mutex);
                 return (-EPERM);        /* no permission this time */
         }
-        unlock_kernel();
+        mutex_unlock(&hysdn_conf_mutex);
         return nonseekable_open(ino, filep);
 }                               /* hysdn_conf_open */
 
@@ -319,7 +320,7 @@ hysdn_conf_close(struct inode *ino, struct file *filep)
         int retval = 0;
         struct proc_dir_entry *pd;
 
-        lock_kernel();
+        mutex_lock(&hysdn_conf_mutex);
         /* search the addressed card */
         card = card_root;
         while (card) {
@@ -329,7 +330,7 @@ hysdn_conf_close(struct inode *ino, struct file *filep)
                 card = card->next;      /* search next entry */
         }
         if (!card) {
-                unlock_kernel();
+                mutex_unlock(&hysdn_conf_mutex);
                 return (-ENODEV);       /* device is unknown/invalid */
         }
         if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
@@ -352,7 +353,7 @@ hysdn_conf_close(struct inode *ino, struct file *filep)
 
                 kfree(filep->private_data);     /* release memory */
         }
-        unlock_kernel();
+        mutex_unlock(&hysdn_conf_mutex);
         return (retval);
 }                               /* hysdn_conf_close */
 
diff --git a/drivers/isdn/hysdn/hysdn_proclog.c b/drivers/isdn/hysdn/hysdn_proclog.c
index e83f6fda32f..37a9dd33730 100644
--- a/drivers/isdn/hysdn/hysdn_proclog.c
+++ b/drivers/isdn/hysdn/hysdn_proclog.c
@@ -15,13 +15,14 @@
 #include <linux/proc_fs.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include "hysdn_defs.h"
 
 /* the proc subdir for the interface is defined in the procconf module */
 extern struct proc_dir_entry *hysdn_proc_entry;
 
+static DEFINE_MUTEX(hysdn_log_mutex);
 static void put_log_buffer(hysdn_card * card, char *cp);
 
 /*************************************************/
@@ -251,7 +252,7 @@ hysdn_log_open(struct inode *ino, struct file *filep)
         struct procdata *pd = NULL;
         unsigned long flags;
 
-        lock_kernel();
+        mutex_lock(&hysdn_log_mutex);
         card = card_root;
         while (card) {
                 pd = card->proclog;
@@ -260,7 +261,7 @@ hysdn_log_open(struct inode *ino, struct file *filep)
                 card = card->next;      /* search next entry */
         }
         if (!card) {
-                unlock_kernel();
+                mutex_unlock(&hysdn_log_mutex);
                 return (-ENODEV);       /* device is unknown/invalid */
         }
         filep->private_data = card;     /* remember our own card */
@@ -278,10 +279,10 @@ hysdn_log_open(struct inode *ino, struct file *filep)
                         filep->private_data = &pd->log_head;
                 spin_unlock_irqrestore(&card->hysdn_lock, flags);
         } else {                /* simultaneous read/write access forbidden ! */
-                unlock_kernel();
+                mutex_unlock(&hysdn_log_mutex);
                 return (-EPERM);        /* no permission this time */
         }
-        unlock_kernel();
+        mutex_unlock(&hysdn_log_mutex);
         return nonseekable_open(ino, filep);
 }                               /* hysdn_log_open */
 
@@ -300,7 +301,7 @@ hysdn_log_close(struct inode *ino, struct file *filep)
         hysdn_card *card;
         int retval = 0;
 
-        lock_kernel();
+        mutex_lock(&hysdn_log_mutex);
         if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
                 /* write only access -> write debug level written */
                 retval = 0;     /* success */
@@ -339,7 +340,7 @@ hysdn_log_close(struct inode *ino, struct file *filep)
                                         kfree(inf);
                                 }
         }                       /* read access */
-        unlock_kernel();
+        mutex_unlock(&hysdn_log_mutex);
 
         return (retval);
 }                               /* hysdn_log_close */
diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c
index a44cdb492ea..15632bd2f64 100644
--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -17,7 +17,7 @@
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/isdn.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include "isdn_common.h"
 #include "isdn_tty.h"
 #include "isdn_net.h"
@@ -42,6 +42,7 @@ MODULE_LICENSE("GPL");
 
 isdn_dev *dev;
 
+static DEFINE_MUTEX(isdn_mutex);
 static char *isdn_revision = "$Revision: 1.1.2.3 $";
 
 extern char *isdn_net_revision;
@@ -1070,7 +1071,7 @@ isdn_read(struct file *file, char __user *buf, size_t count, loff_t * off)
         int retval;
         char *p;
 
-        lock_kernel();
+        mutex_lock(&isdn_mutex);
         if (minor == ISDN_MINOR_STATUS) {
                 if (!file->private_data) {
                         if (file->f_flags & O_NONBLOCK) {
@@ -1163,7 +1164,7 @@ isdn_read(struct file *file, char __user *buf, size_t count, loff_t * off)
 #endif
         retval = -ENODEV;
  out:
-        unlock_kernel();
+        mutex_unlock(&isdn_mutex);
         return retval;
 }
 
@@ -1180,7 +1181,7 @@ isdn_write(struct file *file, const char __user *buf, size_t count, loff_t * off
         if (!dev->drivers)
                 return -ENODEV;
 
-        lock_kernel();
+        mutex_lock(&isdn_mutex);
         if (minor <= ISDN_MINOR_BMAX) {
                 printk(KERN_WARNING "isdn_write minor %d obsolete!\n", minor);
                 drvidx = isdn_minor2drv(minor);
@@ -1225,7 +1226,7 @@ isdn_write(struct file *file, const char __user *buf, size_t count, loff_t * off
 #endif
         retval = -ENODEV;
  out:
-        unlock_kernel();
+        mutex_unlock(&isdn_mutex);
         return retval;
 }
 
@@ -1236,7 +1237,7 @@ isdn_poll(struct file *file, poll_table * wait)
         unsigned int minor = iminor(file->f_path.dentry->d_inode);
         int drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
 
-        lock_kernel();
+        mutex_lock(&isdn_mutex);
         if (minor == ISDN_MINOR_STATUS) {
                 poll_wait(file, &(dev->info_waitq), wait);
                 /* mask = POLLOUT | POLLWRNORM; */
@@ -1266,7 +1267,7 @@ isdn_poll(struct file *file, poll_table * wait)
 #endif
         mask = POLLERR;
  out:
-        unlock_kernel();
+        mutex_unlock(&isdn_mutex);
         return mask;
 }
 
@@ -1727,9 +1728,9 @@ isdn_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&isdn_mutex);
         ret = isdn_ioctl(file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&isdn_mutex);
 
         return ret;
 }
@@ -1745,7 +1746,7 @@ isdn_open(struct inode *ino, struct file *filep)
         int chidx;
         int retval = -ENODEV;
 
-        lock_kernel();
+        mutex_lock(&isdn_mutex);
         if (minor == ISDN_MINOR_STATUS) {
                 infostruct *p;
 
@@ -1796,7 +1797,7 @@ isdn_open(struct inode *ino, struct file *filep)
 #endif
  out:
         nonseekable_open(ino, filep);
-        unlock_kernel();
+        mutex_unlock(&isdn_mutex);
         return retval;
 }
 
@@ -1805,7 +1806,7 @@ isdn_close(struct inode *ino, struct file *filep)
 {
         uint minor = iminor(ino);
 
-        lock_kernel();
+        mutex_lock(&isdn_mutex);
         if (minor == ISDN_MINOR_STATUS) {
                 infostruct *p = dev->infochain;
                 infostruct *q = NULL;
@@ -1839,7 +1840,7 @@ isdn_close(struct inode *ino, struct file *filep)
 #endif
 
  out:
-        unlock_kernel();
+        mutex_unlock(&isdn_mutex);
         return 0;
 }
 
diff --git a/drivers/isdn/mISDN/timerdev.c b/drivers/isdn/mISDN/timerdev.c
index 81048b8ed8a..de43c8c70ad 100644
--- a/drivers/isdn/mISDN/timerdev.c
+++ b/drivers/isdn/mISDN/timerdev.c
@@ -24,9 +24,10 @@
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/mISDNif.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include "core.h"
 
+static DEFINE_MUTEX(mISDN_mutex);
 static u_int    *debug;
 
 
@@ -224,7 +225,7 @@ mISDN_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
         if (*debug & DEBUG_TIMER)
                 printk(KERN_DEBUG "%s(%p, %x, %lx)\n", __func__,
                     filep, cmd, arg);
-        lock_kernel();
+        mutex_lock(&mISDN_mutex);
         switch (cmd) {
         case IMADDTIMER:
                 if (get_user(tout, (int __user *)arg)) {
@@ -256,7 +257,7 @@ mISDN_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
         default:
                 ret = -EINVAL;
         }
-        unlock_kernel();
+        mutex_unlock(&mISDN_mutex);
         return ret;
 }