You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

Nils Carlson 273ef9509b drivers/char/hpet.c: fix periodic-emulation for delayed interrupts ... When interrupts are delayed due to interrupt masking or due to other interrupts being serviced the HPET periodic-emuation would fail. This happened because given an interval t and a time for the current interrupt m we would compute the next time as t + m. This works until we are delayed for > t, in which case we would be writing a new value which is in fact in the past. This can be solved by computing the next time instead as (k * t) + m where k is large enough to be in the future. The exact computation of k is described in a comment to the code. More detail: Assuming an interval of 5 between each expected interrupt we have a normal case of t0: interrupt, read t0 from comparator, set next interrupt t0 + 5 t5: interrupt, read t5 from comparator, set next interrupt t5 + 5 t10: interrupt, read t10 from comparator, set next interrupt t10 + 5 ... So, what happens when the interrupt is serviced too late? t0: interrupt, read t0 from comparator, set next interrupt t0 + 5 t11: delayed interrupt serviced, read t5 from comparator, set next interrupt t5 + 5, which is in the past! ... counter loops ... t10: Much much later, get the next interrupt. This can happen either because we have interrupts masked for too long (some stupid driver goes on a printk rampage) or just because we are pushing the limits of the interval (too small a period), or both most probably. My solution is to read the main counter as well and set the next interrupt to occur at the right interval, for example: t0: interrupt, read t0 from comparator, set next interrupt t0 + 5 t11: delayed interrupt serviced, read t5 from comparator, set next interrupt t15 as t10 has been missed. t15: back on track. Signed-off-by: Nils Carlson <nils.carlson@ericsson.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		14 years ago
..
agp	agp/uninorth: Fix lockups with radeon KMS and >1x.	14 years ago
hw_random	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	14 years ago
ipmi	ipmi: convert to seq_file interface	14 years ago
mwave	Fix common misspellings	14 years ago
pcmcia	pcmcia: Convert pcmcia_device_id declarations to const	14 years ago
tpm	char/tpm: Fix unitialized usage of data buffer	14 years ago
xilinx_hwicap	drivercore: revert addition of of_match to struct device	14 years ago
Kconfig	Allow setting of number of raw devices as a module parameter	14 years ago
Makefile	drivers/char: add MSM smd_pkt driver	14 years ago
apm-emulation.c	apm-emulation: apm_mutex breaks ACK; remove it	14 years ago
applicom.c	drivers/char/applicom.c: fix information leak to userland	14 years ago
applicom.h	…
bfin-otp.c	llseek: automatically add .llseek fop	15 years ago
briq_panel.c	BKL: remove extraneous #include <smp_lock.h>	14 years ago
bsr.c	powerpc/pseries/bsr: Remove redundant initialization of bsr dev_t declaration.	14 years ago
ds1302.c	Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl	14 years ago
ds1620.c	Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl	14 years ago
dsp56k.c	Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl	14 years ago
dtlk.c	Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl	14 years ago
efirtc.c	efirtc: explicitly set llseek to no_llseek	15 years ago
generic_nvram.c	drivers: autoconvert trivial BKL users to private mutex	15 years ago
genrtc.c	Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl	14 years ago
hangcheck-timer.c	Input: sysrq - drop tty argument form handle_sysrq()	15 years ago
hpet.c	drivers/char/hpet.c: fix periodic-emulation for delayed interrupts	14 years ago
i8k.c	i8k: Integrate with the hwmon subsystem	14 years ago
lp.c	Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl	14 years ago
mbcs.c	drivers: autoconvert trivial BKL users to private mutex	15 years ago
mbcs.h	Fix common misspellings	14 years ago
mem.c	kmsg: properly support writev to avoid interleaved printk lines fix	14 years ago
misc.c	llseek: automatically add .llseek fop	15 years ago
mmtimer.c	posix-timers: Cleanup namespace	14 years ago
msm_smd_pkt.c	drivers/char: add MSM smd_pkt driver	14 years ago
mspec.c	drivers/char/mspec.c: use {k,v}zalloc to allocate memory	14 years ago
nsc_gpio.c	…
nvram.c	drivers: autoconvert trivial BKL users to private mutex	15 years ago
nwbutton.c	Fix common misspellings	14 years ago
nwbutton.h	…
nwflash.c	drivers: autoconvert trivial BKL users to private mutex	15 years ago
pc8736x_gpio.c	llseek: automatically add .llseek fop	15 years ago
ppdev.c	drivers/char/ppdev.c: put gotten port value	14 years ago
ps3flash.c	drop unused dentry argument to ->fsync	15 years ago
ramoops.c	ramoops: fix types, remove typecasts	14 years ago
random.c	Fix common misspellings	14 years ago
raw.c	RAW driver: Remove call to kobject_put().	14 years ago
rtc.c	of/device: Replace struct of_device with struct platform_device	15 years ago
scc.h	…
scx200_gpio.c	llseek: automatically add .llseek fop	15 years ago
snsc.c	Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl	14 years ago
snsc.h	headers: kobject.h redux	14 years ago
snsc_event.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
sonypi.c	Fix common misspellings	14 years ago
tb0219.c	llseek: automatically add .llseek fop	15 years ago
tlclk.c	Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl	14 years ago
toshiba.c	Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl	14 years ago
ttyprintk.c	tty: now phase out the ioctl file pointer for good	14 years ago
uv_mmtimer.c	BKL: remove extraneous #include <smp_lock.h>	14 years ago
viotape.c	Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl	14 years ago
virtio_console.c	virtio console: don't manually set or finalize VIRTIO_CONSOLE_F_MULTIPORT.	14 years ago