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[158.174.22.210]) by smtp.gmail.com with ESMTPSA id t16sm437836ljj.54.2019.08.29.07.48.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Aug 2019 07:48:10 -0700 (PDT) From: Ulf Hansson To: "Rafael J . Wysocki" , linux-pm@vger.kernel.org Cc: Ulf Hansson , Viresh Kumar , Kevin Hilman , Thara Gopinath Subject: [PATCH 1/2] PM / Domains: Simplify genpd_lookup_dev() Date: Thu, 29 Aug 2019 16:48:05 +0200 Message-Id: <20190829144805.634-1-ulf.hansson@linaro.org> X-Mailer: git-send-email 2.17.1 genpd_lookup_dev(), is a bit unnecessary heavy, as it walks the gpd_list to try to find a valid PM domain corresponding to the device's attached genpd. Instead of walking the gpd_list, let's use the fact that a genpd always has the ->runtime_suspend() callback assigned to the genpd_runtime_suspend() function. While changing this, let's take the opportunity to also rename genpd_lookup_dev(), into dev_to_genpd_safe() to better reflect its purpose. Signed-off-by: Ulf Hansson --- drivers/base/power/domain.c | 23 +++++++++-------------- 1 file changed, 9 insertions(+), 14 deletions(-) -- 2.17.1 diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index b063bc41b0a9..27592b73061d 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -149,29 +149,24 @@ static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, return ret; } +static int genpd_runtime_suspend(struct device *dev); + /* * Get the generic PM domain for a particular struct device. * This validates the struct device pointer, the PM domain pointer, - * and checks that the PM domain pointer is a real generic PM domain. + * and checks that the PM domain pointer is real generic PM domain. * Any failure results in NULL being returned. */ -static struct generic_pm_domain *genpd_lookup_dev(struct device *dev) +static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev) { - struct generic_pm_domain *genpd = NULL, *gpd; - if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) return NULL; - mutex_lock(&gpd_list_lock); - list_for_each_entry(gpd, &gpd_list, gpd_list_node) { - if (&gpd->domain == dev->pm_domain) { - genpd = gpd; - break; - } - } - mutex_unlock(&gpd_list_lock); + /* A genpd's always have its ->runtime_suspend() callback assigned. */ + if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend) + return pd_to_genpd(dev->pm_domain); - return genpd; + return NULL; } /* @@ -1610,7 +1605,7 @@ static int genpd_remove_device(struct generic_pm_domain *genpd, */ int pm_genpd_remove_device(struct device *dev) { - struct generic_pm_domain *genpd = genpd_lookup_dev(dev); + struct generic_pm_domain *genpd = dev_to_genpd_safe(dev); if (!genpd) return -EINVAL;