cpuidle/coupled: Add sanity check for safe_state_index

Since we are using cpuidle_driver::safe_state_index directly as the
target state index, it is better to add the sanity check at the point
of registering the driver.

Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpuidle/coupled.c b/drivers/cpuidle/coupled.c
index 1523e2d..344058f 100644 (file)
--- a/drivers/cpuidle/coupled.c
+++ b/drivers/cpuidle/coupled.c
@@ -186,6 +186,28 @@ bool cpuidle_state_is_coupled(struct cpuidle_driver *drv, int state)
        return drv->states[state].flags & CPUIDLE_FLAG_COUPLED;
 }
 
+/**
+ * cpuidle_coupled_state_verify - check if the coupled states are correctly set.
+ * @drv: struct cpuidle_driver for the platform
+ *
+ * Returns 0 for valid state values, a negative error code otherwise:
+ *  * -EINVAL if any coupled state(safe_state_index) is wrongly set.
+ */
+int cpuidle_coupled_state_verify(struct cpuidle_driver *drv)
+{
+       int i;
+
+       for (i = drv->state_count - 1; i >= 0; i--) {
+               if (cpuidle_state_is_coupled(drv, i) &&
+                   (drv->safe_state_index == i ||
+                    drv->safe_state_index < 0 ||
+                    drv->safe_state_index >= drv->state_count))
+                       return -EINVAL;
+       }
+
+       return 0;
+}
+
 /**
  * cpuidle_coupled_set_ready - mark a cpu as ready
  * @coupled: the struct coupled that contains the current cpu

diff --git a/drivers/cpuidle/cpuidle.h b/drivers/cpuidle/cpuidle.h
index 178c5ad..f87f399 100644 (file)
--- a/drivers/cpuidle/cpuidle.h
+++ b/drivers/cpuidle/cpuidle.h
@@ -35,6 +35,7 @@ extern void cpuidle_remove_sysfs(struct cpuidle_device *dev);
 
 #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
 bool cpuidle_state_is_coupled(struct cpuidle_driver *drv, int state);
+int cpuidle_coupled_state_verify(struct cpuidle_driver *drv);
 int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
                struct cpuidle_driver *drv, int next_state);
 int cpuidle_coupled_register_device(struct cpuidle_device *dev);
@@ -46,6 +47,11 @@ bool cpuidle_state_is_coupled(struct cpuidle_driver *drv, int state)
        return false;
 }
 
+static inline int cpuidle_coupled_state_verify(struct cpuidle_driver *drv)
+{
+       return 0;
+}
+
 static inline int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
                struct cpuidle_driver *drv, int next_state)
 {

diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index 5db1478..389ade4 100644 (file)
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -227,6 +227,10 @@ static int __cpuidle_register_driver(struct cpuidle_driver *drv)
        if (!drv || !drv->state_count)
                return -EINVAL;
 
+       ret = cpuidle_coupled_state_verify(drv);
+       if (ret)
+               return ret;
+
        if (cpuidle_disabled())
                return -ENODEV;