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isdn: autoconvert trivial BKL users to private mutex

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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>
This commit is contained in:
Arnd Bergmann 2010-07-11 11:18:53 +00:00 committed by David S. Miller
parent d361fd599a
commit 76a64921da
9 changed files with 48 additions and 46 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/isdn/capi/capi.c
View file

@ -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;
}

7
drivers/isdn/divert/divert_procfs.c
View file

@ -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;
}

7
drivers/isdn/hardware/eicon/divamnt.c
View file

@ -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;
}

2
drivers/isdn/hardware/eicon/divasi.c
View file

@ -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);
}

2
drivers/isdn/hardware/eicon/divasmain.c
View file

@ -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);
}

21
drivers/isdn/hysdn/hysdn_procconf.c
View file

@ -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 */

15
drivers/isdn/hysdn/hysdn_proclog.c
View file

@ -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 */

27
drivers/isdn/i4l/isdn_common.c
View file

@ -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;
}

7
drivers/isdn/mISDN/timerdev.c
View file

@ -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;
}