From e12b711196a158a475350ee67876a1e9e2601661 Mon Sep 17 00:00:00 2001 From: "Srivatsa S. Bhat" Date: Tue, 11 Mar 2014 02:10:12 +0530 Subject: drivers/base/topology.c: Fix CPU hotplug callback registration Subsystems that want to register CPU hotplug callbacks, as well as perform initialization for the CPUs that are already online, often do it as shown below: get_online_cpus(); for_each_online_cpu(cpu) init_cpu(cpu); register_cpu_notifier(&foobar_cpu_notifier); put_online_cpus(); This is wrong, since it is prone to ABBA deadlocks involving the cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently with CPU hotplug operations). Instead, the correct and race-free way of performing the callback registration is: cpu_notifier_register_begin(); for_each_online_cpu(cpu) init_cpu(cpu); /* Note the use of the double underscored version of the API */ __register_cpu_notifier(&foobar_cpu_notifier); cpu_notifier_register_done(); Fix the topology code by using this latter form of callback registration. Cc: Ingo Molnar Acked-by: Greg Kroah-Hartman Signed-off-by: Srivatsa S. Bhat Signed-off-by: Rafael J. Wysocki --- drivers/base/topology.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'drivers/base') diff --git a/drivers/base/topology.c b/drivers/base/topology.c index 94ffee3..a738d10 100644 --- a/drivers/base/topology.c +++ b/drivers/base/topology.c @@ -161,16 +161,20 @@ static int topology_cpu_callback(struct notifier_block *nfb, static int topology_sysfs_init(void) { int cpu; - int rc; + int rc = 0; + + cpu_notifier_register_begin(); for_each_online_cpu(cpu) { rc = topology_add_dev(cpu); if (rc) - return rc; + goto out; } - hotcpu_notifier(topology_cpu_callback, 0); + __hotcpu_notifier(topology_cpu_callback, 0); - return 0; +out: + cpu_notifier_register_done(); + return rc; } device_initcall(topology_sysfs_init); -- cgit v1.1 From a7a037c837cb0f9d011cb3ca6e6837989986570c Mon Sep 17 00:00:00 2001 From: Daeseok Youn Date: Tue, 1 Apr 2014 19:46:43 +0900 Subject: regmap: adds missing braces in regmap_init() It need to add curly braces because the inner for "if" has two statements. coccicheck says: drivers/base/regmap/regmap.c:765:2-44: code aligned with following code on line 766 Signed-off-by: Daeseok Youn Signed-off-by: Mark Brown --- drivers/base/regmap/regmap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/base') diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 43065ce..e4932a8 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -760,10 +760,11 @@ skip_format_initialization: if (ret != 0) goto err_range; - if (dev) + if (dev) { ret = regmap_attach_dev(dev, map, config); if (ret != 0) goto err_regcache; + } return map; -- cgit v1.1 From 39ac5ba51b69a77a30d2e783aed02ec73c9f6d70 Mon Sep 17 00:00:00 2001 From: Tushar Behera Date: Fri, 28 Mar 2014 10:50:21 +0530 Subject: PM / domains: Add pd_ignore_unused to keep power domains enabled Keep all power-domains already enabled by bootloader on, even if no driver has claimed them. This is useful for debug and development, but should not be needed on a platform with proper driver support. Signed-off-by: Tushar Behera Signed-off-by: Rafael J. Wysocki --- drivers/base/power/domain.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'drivers/base') diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 6f54962..ae098a2 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -705,6 +705,14 @@ static int pm_genpd_runtime_resume(struct device *dev) return 0; } +static bool pd_ignore_unused; +static int __init pd_ignore_unused_setup(char *__unused) +{ + pd_ignore_unused = true; + return 1; +} +__setup("pd_ignore_unused", pd_ignore_unused_setup); + /** * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. */ @@ -712,6 +720,11 @@ void pm_genpd_poweroff_unused(void) { struct generic_pm_domain *genpd; + if (pd_ignore_unused) { + pr_warn("genpd: Not disabling unused power domains\n"); + return; + } + mutex_lock(&gpd_list_lock); list_for_each_entry(genpd, &gpd_list, gpd_list_node) -- cgit v1.1