Re: Question: how to copy to user space from a tasklet

[Yong Zhang]

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
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