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authorArnd Bergmann <arnd@arndb.de>2010-07-11 11:18:57 +0000
committerDavid S. Miller <davem@davemloft.net>2010-07-12 20:21:47 -0700
commit15fd0cd9a2ad24a78fbee369dec8ca660979d57e (patch)
treed81059460702ebfe4617ec6efd6efa7886ac673b /drivers/net/wan/cosa.c
parent76a64921dad9acd76270dc74249f0dfe11c84bb8 (diff)
downloadop-kernel-dev-15fd0cd9a2ad24a78fbee369dec8ca660979d57e.zip
op-kernel-dev-15fd0cd9a2ad24a78fbee369dec8ca660979d57e.tar.gz
net: 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: "David S. Miller" <davem@davemloft.net> Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/wan/cosa.c')
-rw-r--r--drivers/net/wan/cosa.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/net/wan/cosa.c b/drivers/net/wan/cosa.c
index f0bd70f..04c6cd4 100644
--- a/drivers/net/wan/cosa.c
+++ b/drivers/net/wan/cosa.c
@@ -89,7 +89,6 @@
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/device.h>
-#include <linux/smp_lock.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/byteorder.h>
@@ -174,6 +173,7 @@ struct cosa_data {
* Character device major number. 117 was allocated for us.
* The value of 0 means to allocate a first free one.
*/
+static DEFINE_MUTEX(cosa_chardev_mutex);
static int cosa_major = 117;
/*
@@ -944,7 +944,7 @@ static int cosa_open(struct inode *inode, struct file *file)
int n;
int ret = 0;
- lock_kernel();
+ mutex_lock(&cosa_chardev_mutex);
if ((n=iminor(file->f_path.dentry->d_inode)>>CARD_MINOR_BITS)
>= nr_cards) {
ret = -ENODEV;
@@ -976,7 +976,7 @@ static int cosa_open(struct inode *inode, struct file *file)
chan->rx_done = chrdev_rx_done;
spin_unlock_irqrestore(&cosa->lock, flags);
out:
- unlock_kernel();
+ mutex_unlock(&cosa_chardev_mutex);
return ret;
}
@@ -1212,10 +1212,10 @@ static long cosa_chardev_ioctl(struct file *file, unsigned int cmd,
struct cosa_data *cosa;
long ret;
- lock_kernel();
+ mutex_lock(&cosa_chardev_mutex);
cosa = channel->cosa;
ret = cosa_ioctl_common(cosa, channel, cmd, arg);
- unlock_kernel();
+ mutex_unlock(&cosa_chardev_mutex);
return ret;
}
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