diff mbox series

[v2,06/13] cpuidle: psci: Simplify OF parsing of CPU idle state nodes

Message ID 20191029164438.17012-7-ulf.hansson@linaro.org (mailing list archive)
State Not Applicable, archived
Headers show
Series cpuidle: psci: Support hierarchical CPU arrangement | expand

Commit Message

Ulf Hansson Oct. 29, 2019, 4:44 p.m. UTC 
Iterating through the idle state nodes in DT, to find out the number of
states that needs to be allocated is unnecessary, as it has already been
done from dt_init_idle_driver(). Therefore, drop the iteration and use the
number we already have at hand.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---

Changes in v2:
	- Rebased.
	- Renamed variable and fixed tab-intendent.

---
 drivers/cpuidle/cpuidle-psci.c | 35 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 18 deletions(-)

Comments

Sudeep Holla Nov. 15, 2019, 5:13 p.m. UTC | #1 
On Tue, Oct 29, 2019 at 05:44:31PM +0100, Ulf Hansson wrote:
> Iterating through the idle state nodes in DT, to find out the number of
> states that needs to be allocated is unnecessary, as it has already been
> done from dt_init_idle_driver(). Therefore, drop the iteration and use the
> number we already have at hand.
>

Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>

--
Regards,
Sudeep
diff mbox series

Patch

diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c
index 361985f52ddd..761359be50f2 100644
--- a/drivers/cpuidle/cpuidle-psci.c
+++ b/drivers/cpuidle/cpuidle-psci.c
@@ -73,30 +73,24 @@  static int __init psci_dt_parse_state_node(struct device_node *np, u32 *state)
 	return 0;
 }
 
-static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu)
+static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node,
+					unsigned int state_count, int cpu)
 {
-	int i, ret = 0, count = 0;
+	int i, ret = 0;
 	u32 *psci_states;
 	struct device_node *state_node;
 
-	/* Count idle states */
-	while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states",
-					      count))) {
-		count++;
-		of_node_put(state_node);
-	}
-
-	if (!count)
-		return -ENODEV;
-
-	count++; /* Add WFI state too */
-	psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL);
+	state_count++; /* Add WFI state too */
+	psci_states = kcalloc(state_count, sizeof(*psci_states), GFP_KERNEL);
 	if (!psci_states)
 		return -ENOMEM;
 
-	for (i = 1; i < count; i++) {
+	for (i = 1; i < state_count; i++) {
 		state_node = of_parse_phandle(cpu_node, "cpu-idle-states",
 					      i - 1);
+		if (!state_node)
+			break;
+
 		ret = psci_dt_parse_state_node(state_node, &psci_states[i]);
 		of_node_put(state_node);
 
@@ -106,6 +100,11 @@  static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu)
 		pr_debug("psci-power-state %#x index %d\n", psci_states[i], i);
 	}
 
+	if (i != state_count) {
+		ret = -ENODEV;
+		goto free_mem;
+	}
+
 	/* Idle states parsed correctly, initialize per-cpu pointer */
 	per_cpu(psci_power_state, cpu) = psci_states;
 	return 0;
@@ -115,7 +114,7 @@  static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu)
 	return ret;
 }
 
-static __init int psci_cpu_init_idle(unsigned int cpu)
+static __init int psci_cpu_init_idle(unsigned int cpu, unsigned int state_count)
 {
 	struct device_node *cpu_node;
 	int ret;
@@ -131,7 +130,7 @@  static __init int psci_cpu_init_idle(unsigned int cpu)
 	if (!cpu_node)
 		return -ENODEV;
 
-	ret = psci_dt_cpu_init_idle(cpu_node, cpu);
+	ret = psci_dt_cpu_init_idle(cpu_node, state_count, cpu);
 
 	of_node_put(cpu_node);
 
@@ -187,7 +186,7 @@  static int __init psci_idle_init_cpu(int cpu)
 	/*
 	 * Initialize PSCI idle states.
 	 */
-	ret = psci_cpu_init_idle(cpu);
+	ret = psci_cpu_init_idle(cpu, ret);
 	if (ret) {
 		pr_err("CPU %d failed to PSCI idle\n", cpu);
 		goto out_kfree_drv;