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authorArnd Bergmann <arnd@arndb.de>2010-07-11 11:18:53 +0000
committerDavid S. Miller <davem@davemloft.net>2010-07-12 20:21:47 -0700
commit76a64921dad9acd76270dc74249f0dfe11c84bb8 (patch)
tree42eaa62b3c886e46b29bbae354fe87bf8475d970 /drivers/isdn/hardware
parentd361fd599a991ff6c1d522a599c635b35d61ef30 (diff)
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' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn/hardware')
-rw-r--r--drivers/isdn/hardware/eicon/divamnt.c7
-rw-r--r--drivers/isdn/hardware/eicon/divasi.c2
-rw-r--r--drivers/isdn/hardware/eicon/divasmain.c2
3 files changed, 4 insertions, 7 deletions
diff --git a/drivers/isdn/hardware/eicon/divamnt.c b/drivers/isdn/hardware/eicon/divamnt.c
index 1e85f743214e..f1d464f1e107 100644
--- a/drivers/isdn/hardware/eicon/divamnt.c
+++ b/drivers/isdn/hardware/eicon/divamnt.c
@@ -14,7 +14,7 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/poll.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <asm/uaccess.h>
#include "platform.h"
@@ -22,6 +22,7 @@
#include "divasync.h"
#include "debug_if.h"
+static DEFINE_MUTEX(maint_mutex);
static char *main_revision = "$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 f577719ab3fa..42d3b8346034 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 fbbcb27fb681..16a874bb1561 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);
}