kernel.git/sound/core/hrtimer.c, branch linux-2.6.33.y

ALSA: hrtimer: handle delayed timer interrupts

2011-03-21T19:44:51Z

commit b1d4f7f4bdcf9915c41ff8cfc4425c84dabb1fde upstream. If a timer interrupt was delayed too much, hrtimer_forward_now() will forward the timer expiry more than once. When this happens, the additional number of elapsed ALSA timer ticks must be passed to snd_timer_interrupt() to prevent the ALSA timer from falling behind. This mostly fixes MIDI slowdown problems on highly-loaded systems with badly behaved interrupt handlers. Signed-off-by: Clemens Ladisch Reported-and-tested-by: Arthur Marsh Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman

ALSA: hrtimer - Fix lock-up

2009-12-11T11:53:27Z

The timer stop callback can be called from snd_timer_interrupt(), which is called from the hrtimer callback. Since hrtimer_cancel() waits for the callback completion, this eventually results in a lock-up. This patch fixes the problem by just toggling a flag at stop callback and call hrtimer_cancel() later. Reported-and-tested-by: Wojtek Zabolotny Cc: Signed-off-by: Takashi Iwai

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2008-12-31T00:16:21Z

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: hrtimers: fix warning in kernel/hrtimer.c x86: make sure we really have an hpet mapping before using it x86: enable HPET on Fujitsu u9200 linux/timex.h: cleanup for userspace posix-timers: simplify de_thread()->exit_itimers() path posix-timers: check ->it_signal instead of ->it_pid to validate the timer posix-timers: use "struct pid*" instead of "struct task_struct*" nohz: suppress needless timer reprogramming clocksource, acpi_pm.c: put acpi_pm_read_slow() under CONFIG_PCI nohz: no softirq pending warnings for offline cpus hrtimer: removing all ur callback modes, fix hrtimer: removing all ur callback modes, fix hotplug hrtimer: removing all ur callback modes x86: correct link to HPET timer specification rtc-cmos: export second NVRAM bank Fixed up conflicts in sound/drivers/pcsp/pcsp.c and sound/core/hrtimer.c manually.

ALSA: hrtimer - Use hard-irq callback

2008-12-08T11:40:56Z

Use the hard-irq mode for the callback (for possible removal of soft-irq mode in future). Signed-off-by: Takashi Iwai

ALSA: timer - Add comments and use ns_to_ktime()

2008-12-08T11:16:58Z

Add the license and misc comments at the beginning of the code. Also, use ns_to_ktime() for simplification. Signed-off-by: Takashi Iwai

ALSA: Add hrtimer backend for ALSA timer interface

2008-10-24T16:16:50Z

Added the hrtimer backend for ALSA timer interface. It can be used for the sequencer timer source. Signed-off-by: Takashi Iwai