/* * linux/kernel/time/tick-oneshot.c * * This file contains functions which manage high resolution tick * related events. * * Copyright(C) 2005-2006, Thomas Gleixner * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner * * This code is licenced under the GPL version 2. For details see * kernel-base/COPYING. */ #include #include #include #include #include #include #include #include "tick-internal.h" /** * tick_program_event */ int tick_program_event(ktime_t expires, int force) { struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev); if (unlikely(expires == KTIME_MAX)) { /* * We don't need the clock event device any more, stop it. */ clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT_STOPPED); return 0; } if (unlikely(clockevent_state_oneshot_stopped(dev))) { /* * We need the clock event again, configure it in ONESHOT mode * before using it. */ clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT); } return clockevents_program_event(dev, expires, force); } /** * tick_resume_onshot - resume oneshot mode */ void tick_resume_oneshot(void) { struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev); clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT); clockevents_program_event(dev, ktime_get(), true); } /** * tick_setup_oneshot - setup the event device for oneshot mode (hres or nohz) */ void tick_setup_oneshot(struct clock_event_device *newdev, void (*handler)(struct clock_event_device *), ktime_t next_event) { newdev->event_handler = handler; clockevents_switch_state(newdev, CLOCK_EVT_STATE_ONESHOT); clockevents_program_event(newdev, next_event, true); } /** * tick_switch_to_oneshot - switch to oneshot mode */ int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)) { struct tick_device *td = this_cpu_ptr(&tick_cpu_device); struct clock_event_device *dev = td->evtdev; if (!dev || !(dev->features & CLOCK_EVT_FEAT_ONESHOT) || !tick_device_is_functional(dev)) { printk(KERN_INFO "Clockevents: " "could not switch to one-shot mode:"); if (!dev) { printk(" no tick device\n"); } else { if (!tick_device_is_functional(dev)) printk(" %s is not functional.\n", dev->name); else printk(" %s does not support one-shot mode.\n", dev->name); } return -EINVAL; } td->mode = TICKDEV_MODE_ONESHOT; dev->event_handler = handler; clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT); tick_broadcast_switch_to_oneshot(); return 0; } /** * tick_check_oneshot_mode - check whether the system is in oneshot mode * * returns 1 when either nohz or highres are enabled. otherwise 0. */ int tick_oneshot_mode_active(void) { unsigned long flags; int ret; local_irq_save(flags); ret = __this_cpu_read(tick_cpu_device.mode) == TICKDEV_MODE_ONESHOT; local_irq_restore(flags); return ret; } #ifdef CONFIG_HIGH_RES_TIMERS /** * tick_init_highres - switch to high resolution mode * * Called with interrupts disabled. */ int tick_init_highres(void) { return tick_switch_to_oneshot(hrtimer_interrupt); } #endif ab15709dbbaf90d3dd1'/>
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authorAlexander Stein <alexander.stein@systec-electronic.com>2017-01-30 12:35:28 +0100
committerLinus Walleij <linus.walleij@linaro.org>2017-01-30 15:53:57 +0100
commitcdca06e4e85974d8a3503ab15709dbbaf90d3dd1 (patch)
tree268b0c01070a957006db97c88dccb5fb061440ff /net/bluetooth/mgmt_util.c
parent1b89970d81bbd52720fc64a3fe9572ee33588363 (diff)
pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler
According to VLI64 Intel Atom E3800 Specification Update (#329901) concurrent read accesses may result in returning 0xffffffff and write accesses may be dropped silently. To workaround all accesses must be protected by locks. Cc: stable@vger.kernel.org Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'net/bluetooth/mgmt_util.c')