Add a bunch of cycle_kernel_lock() calls

All of the open() functions which don't need the BKL on their face may
still depend on its acquisition to serialize opens against driver
initialization.  So make those functions acquire then release the BKL to be
on the safe side.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/char/vr41xx_giu.c b/drivers/char/vr41xx_giu.c
index 412937fdb958..ffe9b4e3072e 100644
--- a/drivers/char/vr41xx_giu.c
+++ b/drivers/char/vr41xx_giu.c
@@ -27,6 +27,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/smp_lock.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 
@@ -543,12 +544,11 @@ static ssize_t gpio_write(struct file *file, const char __user *data,
         return i;
 }
 
-/* No BKL needed here; only global (giu_nr_pins) is only set
-   at probe time */
 static int gpio_open(struct inode *inode, struct file *file)
 {
         unsigned int pin;
 
+        cycle_kernel_lock();
         pin = iminor(inode);
         if (pin >= giu_nr_pins)
                 return -EBADF;