pm_qos_params: BKL pushdown

[jmc: added <linux/smp_lock.h>]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index 0afe32be4c8530851a912dde00a6ed5c0f24cf49..8cb757026386f35f7f12e78cc0caef204ea93cb0 100644 (file)
--- a/kernel/pm_qos_params.c
+++ b/kernel/pm_qos_params.c
@@ -29,6 +29,7 @@
 
 #include <linux/pm_qos_params.h>
 #include <linux/sched.h>
+#include <linux/smp_lock.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <linux/time.h>
@@ -358,15 +359,19 @@ static int pm_qos_power_open(struct inode *inode, struct file *filp)
        int ret;
        long pm_qos_class;
 
+       lock_kernel();
        pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
        if (pm_qos_class >= 0) {
                filp->private_data = (void *)pm_qos_class;
                sprintf(name, "process_%d", current->pid);
                ret = pm_qos_add_requirement(pm_qos_class, name,
                                        PM_QOS_DEFAULT_VALUE);
-               if (ret >= 0)
+               if (ret >= 0) {
+                       unlock_kernel();
                        return 0;
+               }
        }
+       unlock_kernel();
 
        return -EPERM;
 }