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authorShreyas B. Prabhu <shreyas@linux.vnet.ibm.com>2016-07-08 11:50:51 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2016-07-15 20:18:42 +1000
commit957efcedeef4b02f2f7e5776d64448e5c40462b4 (patch)
tree0a613b31c1f98caa26fdc32e5263cf8e099eb57c /drivers/cpuidle
parent169f3fae0c6d0024e6a957df9977e04695bf52f2 (diff)
downloadlinux-957efcedeef4b02f2f7e5776d64448e5c40462b4.tar.bz2
cpuidle/powernv: cleanup cpuidle-powernv.c
- Use stack instead of kzalloc'ed memory for variables while probing device tree for idle states. - Set cap for number of idle states that can be added to cpuidle_state_table - Minor change in way we check of_property_read_u32_array for error for sake of consistency - Drop unnecessary "&" while assigning function pointer Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: linux-pm@vger.kernel.org Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle-powernv.c38
1 files changed, 20 insertions, 18 deletions
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index 3a763a823416..600bbe1a7aad 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -100,7 +100,7 @@ static struct cpuidle_state powernv_states[CPUIDLE_STATE_MAX] = {
.desc = "snooze",
.exit_latency = 0,
.target_residency = 0,
- .enter = &snooze_loop },
+ .enter = snooze_loop },
};
static int powernv_cpuidle_add_cpu_notifier(struct notifier_block *n,
@@ -166,7 +166,9 @@ static int powernv_add_idle_states(void)
struct device_node *power_mgt;
int nr_idle_states = 1; /* Snooze */
int dt_idle_states;
- u32 *latency_ns, *residency_ns, *flags;
+ u32 latency_ns[CPUIDLE_STATE_MAX];
+ u32 residency_ns[CPUIDLE_STATE_MAX];
+ u32 flags[CPUIDLE_STATE_MAX];
int i, rc;
/* Currently we have snooze statically defined */
@@ -184,22 +186,28 @@ static int powernv_add_idle_states(void)
goto out;
}
- flags = kzalloc(sizeof(*flags) * dt_idle_states, GFP_KERNEL);
+ /*
+ * Since snooze is used as first idle state, max idle states allowed is
+ * CPUIDLE_STATE_MAX -1
+ */
+ if (dt_idle_states > CPUIDLE_STATE_MAX - 1) {
+ pr_warn("cpuidle-powernv: discovered idle states more than allowed");
+ dt_idle_states = CPUIDLE_STATE_MAX - 1;
+ }
+
if (of_property_read_u32_array(power_mgt,
"ibm,cpu-idle-state-flags", flags, dt_idle_states)) {
pr_warn("cpuidle-powernv : missing ibm,cpu-idle-state-flags in DT\n");
- goto out_free_flags;
+ goto out;
}
- latency_ns = kzalloc(sizeof(*latency_ns) * dt_idle_states, GFP_KERNEL);
- rc = of_property_read_u32_array(power_mgt,
- "ibm,cpu-idle-state-latencies-ns", latency_ns, dt_idle_states);
- if (rc) {
+ if (of_property_read_u32_array(power_mgt,
+ "ibm,cpu-idle-state-latencies-ns", latency_ns,
+ dt_idle_states)) {
pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-latencies-ns in DT\n");
- goto out_free_latency;
+ goto out;
}
- residency_ns = kzalloc(sizeof(*residency_ns) * dt_idle_states, GFP_KERNEL);
rc = of_property_read_u32_array(power_mgt,
"ibm,cpu-idle-state-residency-ns", residency_ns, dt_idle_states);
@@ -215,7 +223,7 @@ static int powernv_add_idle_states(void)
strcpy(powernv_states[nr_idle_states].desc, "Nap");
powernv_states[nr_idle_states].flags = 0;
powernv_states[nr_idle_states].target_residency = 100;
- powernv_states[nr_idle_states].enter = &nap_loop;
+ powernv_states[nr_idle_states].enter = nap_loop;
}
/*
@@ -230,7 +238,7 @@ static int powernv_add_idle_states(void)
strcpy(powernv_states[nr_idle_states].desc, "FastSleep");
powernv_states[nr_idle_states].flags = CPUIDLE_FLAG_TIMER_STOP;
powernv_states[nr_idle_states].target_residency = 300000;
- powernv_states[nr_idle_states].enter = &fastsleep_loop;
+ powernv_states[nr_idle_states].enter = fastsleep_loop;
}
#endif
powernv_states[nr_idle_states].exit_latency =
@@ -243,12 +251,6 @@ static int powernv_add_idle_states(void)
nr_idle_states++;
}
-
- kfree(residency_ns);
-out_free_latency:
- kfree(latency_ns);
-out_free_flags:
- kfree(flags);
out:
return nr_idle_states;
}