From 22f6a0f0e3549b73b3319e26e1689f72b1f1284b Mon Sep 17 00:00:00 2001 From: Shaibal Dutta Date: Sat, 1 Feb 2014 19:16:46 -0800 Subject: [PATCH] usb: move hub init and LED blink work to power efficient workqueue Allow the scheduler to select the best CPU to handle hub initalization and LED blinking work. This extends idle residency times on idle CPUs and conserves power. This functionality is enabled when CONFIG_WQ_POWER_EFFICIENT is selected. [zoran.markovic@linaro.org: Rebased to latest kernel. Added commit message. Changed reference from system to power efficient workqueue for LEDs in check_highspeed() and hub_port_connect_change().] Acked-by: Alan Stern Cc: Sarah Sharp Cc: Xenia Ragiadakou Cc: Julius Werner Cc: Krzysztof Mazur Cc: Matthias Beyer Cc: Dan Williams Cc: Mathias Nyman Cc: Thomas Pugliese Signed-off-by: Shaibal Dutta Signed-off-by: Zoran Markovic Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 64ea21971be2..519f2c3594b2 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -499,7 +499,8 @@ static void led_work (struct work_struct *work) changed++; } if (changed) - schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); + queue_delayed_work(system_power_efficient_wq, + &hub->leds, LED_CYCLE_PERIOD); } /* use a short timeout for hub/port status fetches */ @@ -1041,7 +1042,8 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) if (type == HUB_INIT) { delay = hub_power_on(hub, false); PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); - schedule_delayed_work(&hub->init_work, + queue_delayed_work(system_power_efficient_wq, + &hub->init_work, msecs_to_jiffies(delay)); /* Suppress autosuspend until init is done */ @@ -1195,7 +1197,8 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) /* Don't do a long sleep inside a workqueue routine */ if (type == HUB_INIT2) { PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); - schedule_delayed_work(&hub->init_work, + queue_delayed_work(system_power_efficient_wq, + &hub->init_work, msecs_to_jiffies(delay)); return; /* Continues at init3: below */ } else { @@ -1209,7 +1212,8 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) if (status < 0) dev_err(hub->intfdev, "activate --> %d\n", status); if (hub->has_indicators && blinkenlights) - schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); + queue_delayed_work(system_power_efficient_wq, + &hub->leds, LED_CYCLE_PERIOD); /* Scan all ports that need attention */ kick_khubd(hub); @@ -4311,7 +4315,8 @@ check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) /* hub LEDs are probably harder to miss than syslog */ if (hub->has_indicators) { hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; - schedule_delayed_work (&hub->leds, 0); + queue_delayed_work(system_power_efficient_wq, + &hub->leds, 0); } } kfree(qual); @@ -4540,7 +4545,9 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1, if (hub->has_indicators) { hub->indicator[port1-1] = INDICATOR_AMBER_BLINK; - schedule_delayed_work (&hub->leds, 0); + queue_delayed_work( + system_power_efficient_wq, + &hub->leds, 0); } status = -ENOTCONN; /* Don't retry */ goto loop_disable; -- 2.20.1