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| author | Jonathan Corbet <corbet@lwn.net> | 2008-05-16 14:03:05 -0600 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2008-06-20 14:05:51 -0600 |
| commit | 4541b5ec9f631a143cdea862d07ddfc3cdac36f2 (patch) | |
| tree | 1b14d1f481c20790e7577b31fa76fb3952205cf8 /drivers/misc/phantom.c | |
| parent | 057e7c7ff9f91a36a761588c53826bd6a710aeba (diff) | |
| download | linux-4541b5ec9f631a143cdea862d07ddfc3cdac36f2.tar.gz linux-4541b5ec9f631a143cdea862d07ddfc3cdac36f2.tar.bz2 linux-4541b5ec9f631a143cdea862d07ddfc3cdac36f2.zip | |
phantom: BKL pushdown
Add explicit lock_kernel calls to phantom_open().
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'drivers/misc/phantom.c')
| -rw-r--r-- | drivers/misc/phantom.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/misc/phantom.c b/drivers/misc/phantom.c index 71d1c84e2fa8..186162470090 100644 --- a/drivers/misc/phantom.c +++ b/drivers/misc/phantom.c @@ -22,6 +22,7 @@ #include <linux/interrupt.h> #include <linux/cdev.h> #include <linux/phantom.h> +#include <linux/smp_lock.h> #include <asm/atomic.h> #include <asm/io.h> @@ -212,13 +213,17 @@ static int phantom_open(struct inode *inode, struct file *file) struct phantom_device *dev = container_of(inode->i_cdev, struct phantom_device, cdev); + lock_kernel(); nonseekable_open(inode, file); - if (mutex_lock_interruptible(&dev->open_lock)) + if (mutex_lock_interruptible(&dev->open_lock)) { + unlock_kernel(); return -ERESTARTSYS; + } if (dev->opened) { mutex_unlock(&dev->open_lock); + unlock_kernel(); return -EINVAL; } @@ -229,7 +234,7 @@ static int phantom_open(struct inode *inode, struct file *file) atomic_set(&dev->counter, 0); dev->opened++; mutex_unlock(&dev->open_lock); - + unlock_kernel(); return 0; } |