Re: [Linux-kernel-mentees] [PATCH] net: usb: Fix uninit-was-stored issue in asix_read_cmd()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Tue, Aug 25, 2020 at 10:39:46AM -0400, Alan Stern wrote:
> On Tue, Aug 25, 2020 at 08:51:35AM +0200, Greg Kroah-Hartman wrote:
> > At first glance, I think this can all be cleaned up, but it will take a
> > bit of tree-wide work.  I agree, we need a "read this message and error
> > if the whole thing is not there", as well as a "send this message and
> > error if the whole thing was not sent", and also a way to handle
> > stack-provided data, which seems to be the primary reason subsystems
> > wrap this call (they want to make it easier on their drivers to use it.)
> > 
> > Let me think about this in more detail, but maybe something like:
> > 	usb_control_msg_read()
> > 	usb_control_msg_send()
> > is a good first step (as the caller knows this) and stack provided data
> > would be allowed, and it would return an error if the whole message was
> > not read/sent properly.  That way we can start converting everything
> > over to a sane, and checkable, api and remove a bunch of wrapper
> > functions as well.
> 
> Suggestion: _read and _send are not a natural pair.  Consider instead
> _read and _write.  _recv and _send don't feel right either, because it
> both cases the host sends the control message -- the difference lies
> in who sends the data.

Yes, naming is hard :)

	usb_control_read_msg()
	usb_control_write_msg()

feels good to me, let me try this out and see if it actually makes sense
to do this on a few in-usb-core files and various drivers...

thanks,

greg k-h
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