Re: [PATCH] Staging: dt3155: Remove copy_to_user for ioctl'sDT3155_{STOP|START}

[Greg KH]

On Wed, Jul 21, 2010 at 09:57:16AM +0200, Jiri Slaby wrote:
> On 07/21/2010 02:57 AM, H Hartley Sweeten wrote:
> > The ioctl's DT3155_STOP and DT3155_START are defined with the macro
> > _IO indicating that they have no parameters. They should not be using
> > copy_to_user to return data to user space.
> 
> This is not a reason for removing them. You should check what real users
> do/expect and base your reasoning on the top of that.
> 
> So could you investigate that?

I agree, we can't remove this, it changes the functionality of the
kernel in a way that userspace might not be expecting.

thanks,

greg k-h
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