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authorArnd Bergmann <arnd@arndb.de>2010-07-12 01:18:56 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-11 01:35:39 +0400
commit925ce689bb31960c839804c19ef38d676f1939b9 (patch)
tree620c9b0f054a613d86aaa62901f93019856de0f9 /drivers/usb/misc/iowarrior.c
parent7c7e2d00435bd8129c4bacb73fe4a2d4db4e7d7c (diff)
downloadlinux-925ce689bb31960c839804c19ef38d676f1939b9.tar.xz
USB: 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/misc/iowarrior.c')
-rw-r--r--drivers/usb/misc/iowarrior.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index 7dc9d3c69984..82966458a004 100644
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -18,7 +18,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/sched.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/usb/iowarrior.h>
@@ -61,6 +61,7 @@ MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/* Module parameters */
+static DEFINE_MUTEX(iowarrior_mutex);
static int debug = 0;
module_param(debug, bool, 0644);
MODULE_PARM_DESC(debug, "debug=1 enables debugging messages");
@@ -493,7 +494,7 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd,
return -ENOMEM;
/* lock this object */
- lock_kernel();
+ mutex_lock(&iowarrior_mutex);
mutex_lock(&dev->mutex);
/* verify that the device wasn't unplugged */
@@ -585,7 +586,7 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd,
error_out:
/* unlock the device */
mutex_unlock(&dev->mutex);
- unlock_kernel();
+ mutex_unlock(&iowarrior_mutex);
kfree(buffer);
return retval;
}
@@ -602,12 +603,12 @@ static int iowarrior_open(struct inode *inode, struct file *file)
dbg("%s", __func__);
- lock_kernel();
+ mutex_lock(&iowarrior_mutex);
subminor = iminor(inode);
interface = usb_find_interface(&iowarrior_driver, subminor);
if (!interface) {
- unlock_kernel();
+ mutex_unlock(&iowarrior_mutex);
err("%s - error, can't find device for minor %d", __func__,
subminor);
return -ENODEV;
@@ -617,7 +618,7 @@ static int iowarrior_open(struct inode *inode, struct file *file)
dev = usb_get_intfdata(interface);
if (!dev) {
mutex_unlock(&iowarrior_open_disc_lock);
- unlock_kernel();
+ mutex_unlock(&iowarrior_mutex);
return -ENODEV;
}
@@ -644,7 +645,7 @@ static int iowarrior_open(struct inode *inode, struct file *file)
out:
mutex_unlock(&dev->mutex);
- unlock_kernel();
+ mutex_unlock(&iowarrior_mutex);
return retval;
}