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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/capi/capi.c
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/capi/capi.c')
-rw-r--r--drivers/isdn/capi/capi.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 0cabe31f26df..b0a4a691cbaa 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;
}