path: root/drivers/char/viotape.c
diff options
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/viotape.c
parentipmi: autoconvert trivial BKL users to private mutex (diff)
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/viotape.c')
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/char/viotape.c b/drivers/char/viotape.c
index 42f7fa442ff8..6f954a808b65 100644
--- a/drivers/char/viotape.c
+++ b/drivers/char/viotape.c
@@ -46,7 +46,7 @@
#include <linux/completion.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
@@ -64,6 +64,7 @@
#define VIOTAPE_KERN_INFO KERN_INFO "viotape: "
+static DEFINE_MUTEX(proc_viotape_mutex);
static int viotape_numdev;
@@ -684,9 +685,9 @@ static long viotap_unlocked_ioctl(struct file *file,
long rc;
- lock_kernel();
+ mutex_lock(&proc_viotape_mutex);
rc = viotap_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
- unlock_kernel();
+ mutex_unlock(&proc_viotape_mutex);
return rc;
@@ -700,7 +701,7 @@ static int viotap_open(struct inode *inode, struct file *file)
if (op == NULL)
return -ENOMEM;
- lock_kernel();
+ mutex_lock(&proc_viotape_mutex);
get_dev_info(file->f_path.dentry->d_inode, &devi);
/* Note: We currently only support one mode! */
@@ -731,7 +732,7 @@ static int viotap_open(struct inode *inode, struct file *file)
- unlock_kernel();
+ mutex_unlock(&proc_viotape_mutex);
return ret;