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path: root/drivers/s390/char/fs3270.c
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Diffstat (limited to 'drivers/s390/char/fs3270.c')
-rw-r--r--drivers/s390/char/fs3270.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/s390/char/fs3270.c b/drivers/s390/char/fs3270.c
index ef36f2132aa..b5ecd59676c 100644
--- a/drivers/s390/char/fs3270.c
+++ b/drivers/s390/char/fs3270.c
@@ -14,6 +14,7 @@
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/types.h>
+#include <linux/smp_lock.h>
#include <asm/ccwdev.h>
#include <asm/cio.h>
@@ -421,6 +422,7 @@ fs3270_open(struct inode *inode, struct file *filp)
if (imajor(filp->f_path.dentry->d_inode) != IBM_FS3270_MAJOR)
return -ENODEV;
+ lock_kernel();
minor = iminor(filp->f_path.dentry->d_inode);
/* Check for minor 0 multiplexer. */
if (minor == 0) {
@@ -429,7 +431,8 @@ fs3270_open(struct inode *inode, struct file *filp)
tty = get_current_tty();
if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) {
mutex_unlock(&tty_mutex);
- return -ENODEV;
+ rc = -ENODEV;
+ goto out;
}
minor = tty->index + RAW3270_FIRSTMINOR;
mutex_unlock(&tty_mutex);
@@ -438,19 +441,22 @@ fs3270_open(struct inode *inode, struct file *filp)
fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor);
if (!IS_ERR(fp)) {
raw3270_put_view(&fp->view);
- return -EBUSY;
+ rc = -EBUSY;
+ goto out;
}
/* Allocate fullscreen view structure. */
fp = fs3270_alloc_view();
- if (IS_ERR(fp))
- return PTR_ERR(fp);
+ if (IS_ERR(fp)) {
+ rc = PTR_ERR(fp);
+ goto out;
+ }
init_waitqueue_head(&fp->wait);
fp->fs_pid = get_pid(task_pid(current));
rc = raw3270_add_view(&fp->view, &fs3270_fn, minor);
if (rc) {
fs3270_free_view(&fp->view);
- return rc;
+ goto out;
}
/* Allocate idal-buffer. */
@@ -458,7 +464,8 @@ fs3270_open(struct inode *inode, struct file *filp)
if (IS_ERR(ib)) {
raw3270_put_view(&fp->view);
raw3270_del_view(&fp->view);
- return PTR_ERR(fp);
+ rc = PTR_ERR(fp);
+ goto out;
}
fp->rdbuf = ib;
@@ -466,9 +473,11 @@ fs3270_open(struct inode *inode, struct file *filp)
if (rc) {
raw3270_put_view(&fp->view);
raw3270_del_view(&fp->view);
- return rc;
+ goto out;
}
filp->private_data = fp;
+out:
+ unlock_kernel();
return 0;
}