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Message-ID: <49BE2365.2070708@ladisch.de> Date: Mon, 16 Mar 2009 11:01:09 +0100 From: Clemens Ladisch <clemens@...isch.de> To: Jussi Laako <jussi@...arnerd.net> CC: linux-kernel@...r.kernel.org Subject: Re: HPET mmap() problem Jussi Laako wrote: > In the JACK audio connection kit we have support for mmap() of /dev/hpet > as our time source (as one of the possibilities). However, there's a > nasty issue with the current driver as it reserves one of the three > comparator-timers per each open() and denies further opens when the > timers are exhausted. And in case it's already used as a system clock > source, two of the timers are already reserved... > > However, we are only interested on the main counter value, and would > like to have unlimited access from number of processes to this value > through mmap() of the device. > > Any ideas/recommendations/suggestions on which way to change the driver > to support this? Don't allocate a hpet_dev in hpet_open but when hpet_ioctl is called for the first time. > Or even better, if someone is already working on this? I'm planning to work on this. HTH Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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