Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752005AbbHQRhq (ORCPT ); Mon, 17 Aug 2015 13:37:46 -0400 Received: from foss.arm.com ([217.140.101.70]:46266 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751675AbbHQRhN (ORCPT ); Mon, 17 Aug 2015 13:37:13 -0400 From: Javi Merino To: linux-pm@vger.kernel.org Cc: dmitry.torokhov@gmail.com, cywang@chromium.org, linux-kernel@vger.kernel.org, punit.agrawal@arm.com, djkurtz@chromium.org, Javi Merino , Zhang Rui , Eduardo Valentin Subject: [PATCH v3 3/4] thermal: power_allocator: don't require tzp to be present for the thermal zone Date: Mon, 17 Aug 2015 18:36:47 +0100 Message-Id: <1439833008-26440-4-git-send-email-javi.merino@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1439833008-26440-1-git-send-email-javi.merino@arm.com> References: <1439288493-19740-1-git-send-email-javi.merino@arm.com> <1439833008-26440-1-git-send-email-javi.merino@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3390 Lines: 106 Thermal zones created using thermal_zone_device_create() may not have tzp. As the governor gets its parameters from there, allocate it while the governor is bound to the thermal zone so that it can operate in it. In this case, tzp is freed when the thermal zone switches to another governor. Cc: Zhang Rui Cc: Eduardo Valentin Signed-off-by: Javi Merino --- While this would be easier to do by just ignoring the thermal zone if there was no tzp, I think the approach in this patch provides a better behavior. drivers/thermal/power_allocator.c | 32 +++++++++++++++++++++++++++----- 1 file changed, 27 insertions(+), 5 deletions(-) diff --git a/drivers/thermal/power_allocator.c b/drivers/thermal/power_allocator.c index b7c006fe20bd..6dcc4fedd4f2 100644 --- a/drivers/thermal/power_allocator.c +++ b/drivers/thermal/power_allocator.c @@ -58,6 +58,8 @@ static inline s64 div_frac(s64 x, s64 y) /** * struct power_allocator_params - parameters for the power allocator governor + * @allocated_tzp: whether we have allocated tzp for this thermal zone and + * it needs to be freed on unbind * @err_integral: accumulated error in the PID controller. * @prev_err: error in the previous iteration of the PID controller. * Used to calculate the derivative term. @@ -70,6 +72,7 @@ static inline s64 div_frac(s64 x, s64 y) * controlling for. */ struct power_allocator_params { + bool allocated_tzp; s64 err_integral; s32 prev_err; int trip_switch_on; @@ -473,8 +476,7 @@ static void allow_maximum_power(struct thermal_zone_device *tz) * Initialize the PID controller parameters and bind it to the thermal * zone. * - * Return: 0 on success, -EINVAL if the thermal zone doesn't have tzp or -ENOMEM - * if we ran out of memory. + * Return: 0 on success, or -ENOMEM if we ran out of memory. */ static int power_allocator_bind(struct thermal_zone_device *tz) { @@ -483,13 +485,20 @@ static int power_allocator_bind(struct thermal_zone_device *tz) unsigned long switch_on_temp, control_temp; u32 sustainable_power, temperature_threshold; - if (!tz->tzp) - return -EINVAL; - params = devm_kzalloc(&tz->device, sizeof(*params), GFP_KERNEL); if (!params) return -ENOMEM; + if (!tz->tzp) { + tz->tzp = kzalloc(sizeof(*tz->tzp), GFP_KERNEL); + if (!tz->tzp) { + ret = -ENOMEM; + goto free_params; + } + + params->allocated_tzp = true; + } + if (!tz->tzp->sustainable_power) dev_warn(&tz->device, "power_allocator: sustainable_power will be estimated\n"); @@ -531,11 +540,24 @@ static int power_allocator_bind(struct thermal_zone_device *tz) tz->governor_data = params; return 0; + +free_params: + devm_kfree(&tz->device, params); + + return ret; } static void power_allocator_unbind(struct thermal_zone_device *tz) { + struct power_allocator_params *params = tz->governor_data; + dev_dbg(&tz->device, "Unbinding from thermal zone %d\n", tz->id); + + if (params->allocated_tzp) { + kfree(tz->tzp); + tz->tzp = NULL; + } + devm_kfree(&tz->device, tz->governor_data); tz->governor_data = NULL; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/