apm_32: BKL pushdown

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c
index bf9290e29013..82222366477f 100644
--- a/arch/x86/kernel/apm_32.c
+++ b/arch/x86/kernel/apm_32.c
@@ -204,6 +204,7 @@
 #include <linux/module.h>
 
 #include <linux/poll.h>
+#include <linux/smp_lock.h>
 #include <linux/types.h>
 #include <linux/stddef.h>
 #include <linux/timer.h>
@@ -1544,10 +1545,12 @@ static int do_open(struct inode *inode, struct file *filp)
 {
         struct apm_user *as;
 
+        lock_kernel();
         as = kmalloc(sizeof(*as), GFP_KERNEL);
         if (as == NULL) {
                 printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
                        sizeof(*as));
+                       unlock_kernel();
                 return -ENOMEM;
         }
         as->magic = APM_BIOS_MAGIC;
@@ -1569,6 +1572,7 @@ static int do_open(struct inode *inode, struct file *filp)
         user_list = as;
         spin_unlock(&user_list_lock);
         filp->private_data = as;
+        unlock_kernel();
         return 0;
 }