PM / QoS: correct the valid range of pm_qos_class

The valid start index for pm_qos_array is not 0, but
PM_QOS_CPU_DMA_LATENCY. There is a null_pm_qos at index 0 of
pm_qos_array.  However, null_pm_qos is not created as misc device so
that inclusion of 0 index for checking pm_qos_class especially for
file operations is not proper here.

[rjw: Changelog, a bit]
Signed-off-by: Sahara <keun-o.park@windriver.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 587dddeebf15610da6f93c35874381ea5156365a..f2f5f6e22a3c34cf7afb330d49c702e8b80c9021 100644 (file)
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -477,7 +477,7 @@ static int find_pm_qos_object_by_minor(int minor)
 {
        int pm_qos_class;
 
-       for (pm_qos_class = 0;
+       for (pm_qos_class = PM_QOS_CPU_DMA_LATENCY;
                pm_qos_class < PM_QOS_NUM_CLASSES; pm_qos_class++) {
                if (minor ==
                        pm_qos_array[pm_qos_class]->pm_qos_power_miscdev.minor)
@@ -491,7 +491,7 @@ static int pm_qos_power_open(struct inode *inode, struct file *filp)
        long pm_qos_class;
 
        pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
-       if (pm_qos_class >= 0) {
+       if (pm_qos_class >= PM_QOS_CPU_DMA_LATENCY) {
                struct pm_qos_request *req = kzalloc(sizeof(*req), GFP_KERNEL);
                if (!req)
                        return -ENOMEM;
@@ -584,7 +584,7 @@ static int __init pm_qos_power_init(void)
 
        BUILD_BUG_ON(ARRAY_SIZE(pm_qos_array) != PM_QOS_NUM_CLASSES);
 
-       for (i = 1; i < PM_QOS_NUM_CLASSES; i++) {
+       for (i = PM_QOS_CPU_DMA_LATENCY; i < PM_QOS_NUM_CLASSES; i++) {
                ret = register_pm_qos_misc(pm_qos_array[i]);
                if (ret < 0) {
                        printk(KERN_ERR "pm_qos_param: %s setup failed\n",