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Message-ID: <20101015021546.GA15339@windriver.com> Date: Fri, 15 Oct 2010 10:15:46 +0800 From: Yong Zhang <yong.zhang@...driver.com> To: Tom Brown <sa212+emis@...onix.com> Cc: LKML <linux-kernel@...r.kernel.org> Subject: Re: Question: how to copy to user space from a tasklet On Thu, Oct 14, 2010 at 11:43:16AM +0100, Tom Brown wrote: > [Sorry to have to ask this here - I can't find any driver-specific > newsgroup or mailing lists - are there any??] > > I have a driver which needs to copy device data direct to user space > from a tasklet. I need to do this because the device is continuously > DMA'ing into user space, with no user intervention, so the user > isn't waiting for data. In other words, I don't have any > user-associated process to wake up. > > This means that I have to somehow copy the data directly to the user > from the tasklet, without sleeping, and without direct access to > user context. Can someone tell me how to do this? Are you seeking for probe_kernel_read/write(include/linux/uaccess.h)? Thanks, Yong > > Thanks > > Tom > -- > 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/ -- 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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