Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Ulf Hansson <ulf.hansson@linaro.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.15 158/189] PM / domains: Fix up
 domain-idle-states OF parsing
Thread-Topic: [PATCH AUTOSEL for 4.15 158/189] PM / domains: Fix up
 domain-idle-states OF parsing
Thread-Index: AQHTz5hYc68iXFq2Q0+F2Jj40Togrg==
Date:   Mon, 9 Apr 2018 00:18:55 +0000
Message-ID: <20180409001637.162453-158-alexander.levin@microsoft.com>
References: <20180409001637.162453-1-alexander.levin@microsoft.com>
In-Reply-To: <20180409001637.162453-1-alexander.levin@microsoft.com>
Accept-Language: en-US
Content-Language: en-US
received-spf: None (protection.outlook.com: microsoft.com does not designate
 permitted sender hosts)
spamdiagnosticoutput: 1:99
spamdiagnosticmetadata: NSPM
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-Network-Message-Id: 923574c2-2480-40cb-32e6-08d59dafc686
X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:18:55.2526
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0920
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

From: Ulf Hansson <ulf.hansson@linaro.org>

[ Upstream commit a3381e3a65cbaf612c8f584906c4dba27e84267c ]

Commit b539cc82d493 (PM / Domains: Ignore domain-idle-states that are
not compatible), made it possible to ignore non-compatible
domain-idle-states OF nodes. However, in case that happens while doing
the OF parsing, the number of elements in the allocated array would
exceed the numbers actually needed, thus wasting memory.

Fix this by pre-iterating the genpd OF node and counting the number of
compatible domain-idle-states nodes, before doing the allocation. While
doing this, it makes sense to rework the code a bit to avoid open coding,
of parts responsible for the OF node iteration.

Let's also take the opportunity to clarify the function header for
of_genpd_parse_idle_states(), about what is being returned in case of
errors.

Fixes: b539cc82d493 (PM / Domains: Ignore domain-idle-states that are not c=
ompatible)
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/base/power/domain.c | 76 +++++++++++++++++++++++++++--------------=
----
 1 file changed, 45 insertions(+), 31 deletions(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 0c80bea05bcb..69520ad6f169 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2293,6 +2293,38 @@ static int genpd_parse_state(struct genpd_power_stat=
e *genpd_state,
 	return 0;
 }
=20
+static int genpd_iterate_idle_states(struct device_node *dn,
+				     struct genpd_power_state *states)
+{
+	int ret;
+	struct of_phandle_iterator it;
+	struct device_node *np;
+	int i =3D 0;
+
+	ret =3D of_count_phandle_with_args(dn, "domain-idle-states", NULL);
+	if (ret <=3D 0)
+		return ret;
+
+	/* Loop over the phandles until all the requested entry is found */
+	of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) {
+		np =3D it.node;
+		if (!of_match_node(idle_state_match, np))
+			continue;
+		if (states) {
+			ret =3D genpd_parse_state(&states[i], np);
+			if (ret) {
+				pr_err("Parsing idle state node %pOF failed with err %d\n",
+				       np, ret);
+				of_node_put(np);
+				return ret;
+			}
+		}
+		i++;
+	}
+
+	return i;
+}
+
 /**
  * of_genpd_parse_idle_states: Return array of idle states for the genpd.
  *
@@ -2302,49 +2334,31 @@ static int genpd_parse_state(struct genpd_power_sta=
te *genpd_state,
  *
  * Returns the device states parsed from the OF node. The memory for the s=
tates
  * is allocated by this function and is the responsibility of the caller t=
o
- * free the memory after use.
+ * free the memory after use. If no domain idle states is found it returns
+ * -EINVAL and in case of errors, a negative error code.
  */
 int of_genpd_parse_idle_states(struct device_node *dn,
 			struct genpd_power_state **states, int *n)
 {
 	struct genpd_power_state *st;
-	struct device_node *np;
-	int i =3D 0;
-	int err, ret;
-	int count;
-	struct of_phandle_iterator it;
-	const struct of_device_id *match_id;
+	int ret;
=20
-	count =3D of_count_phandle_with_args(dn, "domain-idle-states", NULL);
-	if (count <=3D 0)
-		return -EINVAL;
+	ret =3D genpd_iterate_idle_states(dn, NULL);
+	if (ret <=3D 0)
+		return ret < 0 ? ret : -EINVAL;
=20
-	st =3D kcalloc(count, sizeof(*st), GFP_KERNEL);
+	st =3D kcalloc(ret, sizeof(*st), GFP_KERNEL);
 	if (!st)
 		return -ENOMEM;
=20
-	/* Loop over the phandles until all the requested entry is found */
-	of_for_each_phandle(&it, err, dn, "domain-idle-states", NULL, 0) {
-		np =3D it.node;
-		match_id =3D of_match_node(idle_state_match, np);
-		if (!match_id)
-			continue;
-		ret =3D genpd_parse_state(&st[i++], np);
-		if (ret) {
-			pr_err
-			("Parsing idle state node %pOF failed with err %d\n",
-							np, ret);
-			of_node_put(np);
-			kfree(st);
-			return ret;
-		}
+	ret =3D genpd_iterate_idle_states(dn, st);
+	if (ret <=3D 0) {
+		kfree(st);
+		return ret < 0 ? ret : -EINVAL;
 	}
=20
-	*n =3D i;
-	if (!i)
-		kfree(st);
-	else
-		*states =3D st;
+	*states =3D st;
+	*n =3D ret;
=20
 	return 0;
 }
--=20
2.15.1