pcmcia: cm40x0 cdev lock_kernel() pushdown

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 18 insertions, 7 deletions

diff --git a/drivers/char/pcmcia/cm4000_cs.c b/drivers/char/pcmcia/cm4000_cs.c
index 933a7dd8f86..59ca35156d8 100644
--- a/drivers/char/pcmcia/cm4000_cs.c
+++ b/drivers/char/pcmcia/cm4000_cs.c
@@ -1652,16 +1652,22 @@ static int cmm_open(struct inode *inode, struct file *filp)
         struct cm4000_dev *dev;
         struct pcmcia_device *link;
         int minor = iminor(inode);
+        int ret;
 
         if (minor >= CM4000_MAX_DEV)
                 return -ENODEV;
 
+        lock_kernel();
         link = dev_table[minor];
-        if (link == NULL || !pcmcia_dev_present(link))
-                return -ENODEV;
+        if (link == NULL || !pcmcia_dev_present(link)) {
+                ret = -ENODEV;
+                goto out;
+        }
 
-        if (link->open)
-                return -EBUSY;
+        if (link->open) {
+                ret = -EBUSY;
+                goto out;
+        }
 
         dev = link->priv;
         filp->private_data = dev;
@@ -1681,8 +1687,10 @@ static int cmm_open(struct inode *inode, struct file *filp)
          * vaild = block until valid (or card
          * inserted)
          */
-        if (filp->f_flags & O_NONBLOCK)
-                return -EAGAIN;
+        if (filp->f_flags & O_NONBLOCK) {
+                ret = -EAGAIN;
+                goto out;
+        }
 
         dev->mdelay = T_50MSEC;
 
@@ -1692,7 +1700,10 @@ static int cmm_open(struct inode *inode, struct file *filp)
         link->open = 1;         /* only one open per device */
 
         DEBUGP(2, dev, "<- cmm_open\n");
-        return nonseekable_open(inode, filp);
+        ret = nonseekable_open(inode, filp);
+out:
+        unlock_kernel();
+        return ret;
 }
 
 static int cmm_close(struct inode *inode, struct file *filp)