diff options
Diffstat (limited to 'drivers/s390/char/monreader.c')
| -rw-r--r-- | drivers/s390/char/monreader.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c index f0e4c96afbf..35fd8dfcaaa 100644 --- a/drivers/s390/char/monreader.c +++ b/drivers/s390/char/monreader.c @@ -10,6 +10,7 @@ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> +#include <linux/smp_lock.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/kernel.h> @@ -291,6 +292,7 @@ static int mon_open(struct inode *inode, struct file *filp) /* * only one user allowed */ + lock_kernel(); rc = -EBUSY; if (test_and_set_bit(MON_IN_USE, &mon_in_use)) goto out; @@ -327,6 +329,7 @@ static int mon_open(struct inode *inode, struct file *filp) goto out_path; } filp->private_data = monpriv; + unlock_kernel(); return nonseekable_open(inode, filp); out_path: @@ -336,6 +339,7 @@ out_priv: out_use: clear_bit(MON_IN_USE, &mon_in_use); out: + unlock_kernel(); return rc; } |