linux-kernel - Re: [PATCH 02/16] bus: mhi: core: Add support for registering MHI controllers

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Message-ID: <20200124174707.GB3417153@kroah.com>
Date:   Fri, 24 Jan 2020 18:47:07 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jeffrey Hugo <jhugo@...eaurora.org>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        arnd@...db.de, smohanad@...eaurora.org, kvalo@...eaurora.org,
        bjorn.andersson@...aro.org, hemantk@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/16] bus: mhi: core: Add support for registering MHI
 controllers

On Fri, Jan 24, 2020 at 07:24:43AM -0700, Jeffrey Hugo wrote:
> > > +/**
> > > + * struct mhi_result - Completed buffer information
> > > + * @buf_addr: Address of data buffer
> > > + * @dir: Channel direction
> > > + * @bytes_xfer: # of bytes transferred
> > > + * @transaction_status: Status of last transaction
> > > + */
> > > +struct mhi_result {
> > > +	void *buf_addr;
> > 
> > Why void *?
> 
> Because its not possible to resolve this more clearly.  The client provides
> the buffer and knows what the structure is.  The bus does not. Its just an
> opaque pointer (hence void *) to the bus, and the client needs to decode it.
> This is the struct that is handed to the client to allow them to decode the
> activity (either a received buf, or a confirmation that a transmitted buf
> has been consumed).

Then shouldn't this be a "u8 *" instead as you are saying how many bytes
are here?

thanks,

greg k-h