diff options
| -rw-r--r-- | drivers/uio/uio.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 5dccf05..f9b4647 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -47,6 +47,9 @@ static struct uio_class { struct class *class; } *uio_class; +/* Protect idr accesses */ +static DEFINE_MUTEX(minor_lock); + /* * attributes */ @@ -239,7 +242,6 @@ static void uio_dev_del_attributes(struct uio_device *idev) static int uio_get_minor(struct uio_device *idev) { - static DEFINE_MUTEX(minor_lock); int retval = -ENOMEM; int id; @@ -261,7 +263,9 @@ exit: static void uio_free_minor(struct uio_device *idev) { + mutex_lock(&minor_lock); idr_remove(&uio_idr, idev->minor); + mutex_unlock(&minor_lock); } /** @@ -305,8 +309,9 @@ static int uio_open(struct inode *inode, struct file *filep) struct uio_listener *listener; int ret = 0; - lock_kernel(); + mutex_lock(&minor_lock); idev = idr_find(&uio_idr, iminor(inode)); + mutex_unlock(&minor_lock); if (!idev) { ret = -ENODEV; goto out; @@ -332,18 +337,15 @@ static int uio_open(struct inode *inode, struct file *filep) if (ret) goto err_infoopen; } - unlock_kernel(); return 0; err_infoopen: - kfree(listener); -err_alloc_listener: +err_alloc_listener: module_put(idev->owner); out: - unlock_kernel(); return ret; } |