From 762792913f8c71fb4807b25540347e4ace1b5b95 Mon Sep 17 00:00:00 2001 From: Waldemar Rymarkiewicz Date: Thu, 27 Jul 2017 12:01:17 +0200 Subject: [PATCH] PM / OPP: Fix get sharing CPUs when hotplug is used We fail dev_pm_opp_of_get_sharing_cpus() when possible CPU device does not exist. This can happen on platforms where not all possible CPUs are available at start up ie. hotplugged out. The CPU device is not registered in the system so we are not able to check struct device to set the sharing CPUs bitmask properly. Example (real use case): 2 physical MIPS cores, 4 VPE, cpu0/2 run Linux and cpu1/3 are not available for Linux at boot up. cpufreq-dt driver + OPP v2 fail to register opp_table due to the fact there is no struct device for cpu1 (remains offline at bootup). To solve the bug, stop using device struct to check device_node. Instead get CPU device_node directly from device tree with of_get_cpu_node(). Signed-off-by: Waldemar Rymarkiewicz Acked-by: Viresh Kumar Reviewed-by: Stephen Boyd Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/of.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) diff --git a/drivers/base/power/opp/of.c b/drivers/base/power/opp/of.c index 6f0497b377c7..0b718886479b 100644 --- a/drivers/base/power/opp/of.c +++ b/drivers/base/power/opp/of.c @@ -248,15 +248,22 @@ void dev_pm_opp_of_remove_table(struct device *dev) } EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); -/* Returns opp descriptor node for a device, caller must do of_node_put() */ -struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev) +/* Returns opp descriptor node for a device node, caller must + * do of_node_put() */ +static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np) { /* * There should be only ONE phandle present in "operating-points-v2" * property. */ - return of_parse_phandle(dev->of_node, "operating-points-v2", 0); + return of_parse_phandle(np, "operating-points-v2", 0); +} + +/* Returns opp descriptor node for a device, caller must do of_node_put() */ +struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev) +{ + return _opp_of_get_opp_desc_node(dev->of_node); } EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node); @@ -576,8 +583,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) { - struct device_node *np, *tmp_np; - struct device *tcpu_dev; + struct device_node *np, *tmp_np, *cpu_np; int cpu, ret = 0; /* Get OPP descriptor node */ @@ -597,19 +603,18 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, if (cpu == cpu_dev->id) continue; - tcpu_dev = get_cpu_device(cpu); - if (!tcpu_dev) { - dev_err(cpu_dev, "%s: failed to get cpu%d device\n", + cpu_np = of_get_cpu_node(cpu, NULL); + if (!cpu_np) { + dev_err(cpu_dev, "%s: failed to get cpu%d node\n", __func__, cpu); - ret = -ENODEV; + ret = -ENOENT; goto put_cpu_node; } /* Get OPP descriptor node */ - tmp_np = dev_pm_opp_of_get_opp_desc_node(tcpu_dev); + tmp_np = _opp_of_get_opp_desc_node(cpu_np); if (!tmp_np) { - dev_err(tcpu_dev, "%s: Couldn't find opp node.\n", - __func__); + pr_err("%pOF: Couldn't find opp node\n", cpu_np); ret = -ENOENT; goto put_cpu_node; } -- 2.20.1