linux-kernel - [PATCH 3.16 035/158] powerpc/cpuidle: Fix parsing of idle state flags from device-tree

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Message-Id: <20140915192543.939603064@linuxfoundation.org>
Date:	Mon, 15 Sep 2014 12:24:34 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	"Preeti U. Murthy" <preeti@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 3.16 035/158] powerpc/cpuidle: Fix parsing of idle state flags from device-tree

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>

commit 95707d852856aec1cbdad1873ff2dc5161a5cb91 upstream.

Flags from device-tree need to be parsed with accessors for
interpreting correct value in little-endian.

Signed-off-by: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Reviewed-by: Preeti U. Murthy <preeti@...ux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/cpuidle/cpuidle-powernv.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -160,10 +160,10 @@ static int powernv_cpuidle_driver_init(v
 static int powernv_add_idle_states(void)
 {
 	struct device_node *power_mgt;
-	struct property *prop;
 	int nr_idle_states = 1; /* Snooze */
 	int dt_idle_states;
-	u32 *flags;
+	const __be32 *idle_state_flags;
+	u32 len_flags, flags;
 	int i;
 
 	/* Currently we have snooze statically defined */
@@ -174,18 +174,18 @@ static int powernv_add_idle_states(void)
 		return nr_idle_states;
 	}
 
-	prop = of_find_property(power_mgt, "ibm,cpu-idle-state-flags", NULL);
-	if (!prop) {
+	idle_state_flags = of_get_property(power_mgt, "ibm,cpu-idle-state-flags", &len_flags);
+	if (!idle_state_flags) {
 		pr_warn("DT-PowerMgmt: missing ibm,cpu-idle-state-flags\n");
 		return nr_idle_states;
 	}
 
-	dt_idle_states = prop->length / sizeof(u32);
-	flags = (u32 *) prop->value;
+	dt_idle_states = len_flags / sizeof(u32);
 
 	for (i = 0; i < dt_idle_states; i++) {
 
-		if (flags[i] & IDLE_USE_INST_NAP) {
+		flags = be32_to_cpu(idle_state_flags[i]);
+		if (flags & IDLE_USE_INST_NAP) {
 			/* Add NAP state */
 			strcpy(powernv_states[nr_idle_states].name, "Nap");
 			strcpy(powernv_states[nr_idle_states].desc, "Nap");
@@ -196,7 +196,7 @@ static int powernv_add_idle_states(void)
 			nr_idle_states++;
 		}
 
-		if (flags[i] & IDLE_USE_INST_SLEEP) {
+		if (flags & IDLE_USE_INST_SLEEP) {
 			/* Add FASTSLEEP state */
 			strcpy(powernv_states[nr_idle_states].name, "FastSleep");
 			strcpy(powernv_states[nr_idle_states].desc, "FastSleep");


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