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authorArnd Bergmann <arnd@arndb.de>2010-06-02 14:28:52 +0200
committerArnd Bergmann <arnd@arndb.de>2010-10-05 15:01:04 +0200
commit613655fa39ff6957754fa8ceb8559980920eb8ee (patch)
treead19600cb81207b24188683d7fc4ae88013339d1 /drivers/char/ppdev.c
parent609146fdb319cebce93be550938ab852f7bade90 (diff)
downloadop-kernel-dev-613655fa39ff6957754fa8ceb8559980920eb8ee.zip
op-kernel-dev-613655fa39ff6957754fa8ceb8559980920eb8ee.tar.gz
drivers: 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. These drivers do not seem to be under active maintainance from my brief investigation. Apologies to those maintainers that I have missed. 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>
Diffstat (limited to 'drivers/char/ppdev.c')
-rw-r--r--drivers/char/ppdev.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index 02abfdd..723152d 100644
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -67,7 +67,7 @@
#include <linux/slab.h>
#include <linux/major.h>
#include <linux/ppdev.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <linux/uaccess.h>
#define PP_VERSION "ppdev: user-space parallel port driver"
@@ -97,6 +97,7 @@ struct pp_struct {
/* ROUND_UP macro from fs/select.c */
#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
+static DEFINE_MUTEX(pp_do_mutex);
static inline void pp_enable_irq (struct pp_struct *pp)
{
struct parport *port = pp->pdev->port;
@@ -630,9 +631,9 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret;
- lock_kernel();
+ mutex_lock(&pp_do_mutex);
ret = pp_do_ioctl(file, cmd, arg);
- unlock_kernel();
+ mutex_unlock(&pp_do_mutex);
return ret;
}
@@ -641,7 +642,6 @@ static int pp_open (struct inode * inode, struct file * file)
unsigned int minor = iminor(inode);
struct pp_struct *pp;
- cycle_kernel_lock();
if (minor >= PARPORT_MAX)
return -ENXIO;
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