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path: root/drivers/s390/char/monreader.c
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Diffstat (limited to 'drivers/s390/char/monreader.c')
-rw-r--r--drivers/s390/char/monreader.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c
index f0e4c96afbf8..35fd8dfcaaa6 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;
}