From: Ulf Hansson <ulf.hansson@linaro.org>
To: "Rafael J . Wysocki" <rjw@rjwysocki.net>,
Sudeep Holla <sudeep.holla@arm.com>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
linux-pm@vger.kernel.org
Cc: Tony Lindgren <tony@atomide.com>,
Kevin Hilman <khilman@kernel.org>,
Lina Iyer <ilina@codeaurora.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v9 01/11] PM / Domains: Don't treat zero found compatible idle states as an error
Date: Wed, 3 Oct 2018 16:38:14 +0200 [thread overview]
Message-ID: <20181003143824.13059-2-ulf.hansson@linaro.org> (raw)
In-Reply-To: <20181003143824.13059-1-ulf.hansson@linaro.org>
Instead of returning -EINVAL from of_genpd_parse_idle_states() in case none
compatible states was found, let's return 0 to indicate success. Assign
also the out-parameter *states to NULL and *n to 0, to indicate to the
caller that zero states have been found/allocated.
This enables the caller of of_genpd_parse_idle_states() to easier act on
the returned error code.
Cc: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Lina Iyer <ilina@codeaurora.org>
---
drivers/base/power/domain.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 4b5714199490..e1bbddb02871 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2478,8 +2478,8 @@ static int genpd_iterate_idle_states(struct device_node *dn,
*
* Returns the device states parsed from the OF node. The memory for the states
* is allocated by this function and is the responsibility of the caller to
- * free the memory after use. If no domain idle states is found it returns
- * -EINVAL and in case of errors, a negative error code.
+ * free the memory after use. If any or zero compatible domain idle states is
+ * found it returns 0 and in case of errors, a negative error code is returned.
*/
int of_genpd_parse_idle_states(struct device_node *dn,
struct genpd_power_state **states, int *n)
@@ -2488,8 +2488,14 @@ int of_genpd_parse_idle_states(struct device_node *dn,
int ret;
ret = genpd_iterate_idle_states(dn, NULL);
- if (ret <= 0)
- return ret < 0 ? ret : -EINVAL;
+ if (ret < 0)
+ return ret;
+
+ if (!ret) {
+ *states = NULL;
+ *n = 0;
+ return 0;
+ }
st = kcalloc(ret, sizeof(*st), GFP_KERNEL);
if (!st)
--
2.17.1
next prev parent reply other threads:[~2018-10-03 14:38 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-03 14:38 [PATCH v9 00/11] PM / Domains: Support hierarchical CPU arrangement (PSCI/ARM) (a subset) Ulf Hansson
2018-10-03 14:38 ` Ulf Hansson [this message]
2018-10-03 14:38 ` [PATCH v9 02/11] PM / Domains: Deal with multiple states but no governor in genpd Ulf Hansson
2018-10-03 14:38 ` [PATCH v9 03/11] PM / Domains: Document flags for genpd Ulf Hansson
2018-10-04 13:48 ` Tony Lindgren
2018-10-04 14:57 ` Ulf Hansson
2018-10-04 16:13 ` Tony Lindgren
2018-10-03 14:38 ` [PATCH v9 04/11] dt: psci: Update DT bindings to support hierarchical PSCI states Ulf Hansson
2018-10-10 15:03 ` Sudeep Holla
2018-10-11 14:44 ` Ulf Hansson
2018-10-11 16:41 ` Sudeep Holla
2018-10-12 9:43 ` Ulf Hansson
2018-10-12 10:13 ` Sudeep Holla
2018-10-12 10:24 ` Ulf Hansson
2018-10-03 14:38 ` [PATCH v9 05/11] of: base: Add of_get_cpu_state_node() to get idle states for a CPU node Ulf Hansson
2018-10-10 15:03 ` Sudeep Holla
2018-10-11 15:05 ` Ulf Hansson
2018-10-11 16:01 ` Sudeep Holla
2018-10-03 14:38 ` [PATCH v9 06/11] cpuidle: dt: Support hierarchical CPU idle states Ulf Hansson
2018-10-10 15:03 ` Sudeep Holla
2018-10-03 14:38 ` [PATCH v9 07/11] drivers: firmware: psci: Move psci to separate directory Ulf Hansson
2018-10-03 14:38 ` [PATCH v9 08/11] MAINTAINERS: Update files for PSCI Ulf Hansson
2018-10-03 14:38 ` [PATCH v9 09/11] drivers: firmware: psci: Split psci_dt_cpu_init_idle() Ulf Hansson
2018-10-03 14:38 ` [PATCH v9 10/11] drivers: firmware: psci: Support hierarchical CPU idle states Ulf Hansson
2018-10-03 14:38 ` [PATCH v9 11/11] drivers: firmware: psci: Simplify error path of psci_dt_init() Ulf Hansson
2018-10-04 8:39 ` [PATCH v9 00/11] PM / Domains: Support hierarchical CPU arrangement (PSCI/ARM) (a subset) Rafael J. Wysocki
2018-10-04 8:58 ` Ulf Hansson
2018-10-04 9:01 ` Rafael J. Wysocki
2018-10-04 9:32 ` Rafael J. Wysocki
2018-10-04 10:10 ` Ulf Hansson
2018-10-04 15:57 ` Lorenzo Pieralisi
2018-10-04 17:07 ` Rafael J. Wysocki
2018-10-04 17:21 ` Lorenzo Pieralisi
2018-10-04 18:36 ` Ulf Hansson
2018-10-04 18:38 ` Ulf Hansson
2018-10-05 10:47 ` Lorenzo Pieralisi
2018-10-05 11:49 ` Ulf Hansson
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