linux-kernel - Re: [PATCH v1 1/3] usb: typec: ucsi: Limit read size on v1.2

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Date: Wed, 24 Jan 2024 10:59:28 -0800
From: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, Prashant Malani <pmalani@...omium.org>, 
	Abhishek Pandit-Subedi <abhishekpandit@...gle.com>, linux-usb@...r.kernel.org, jthies@...gle.com, 
	Bjorn Andersson <andersson@...nel.org>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	Fabrice Gasnier <fabrice.gasnier@...s.st.com>, Hans de Goede <hdegoede@...hat.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Saranya Gopal <saranya.gopal@...el.com>, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/3] usb: typec: ucsi: Limit read size on v1.2

Ack. Will make dev_dbg on the next iteration.

This seems like a good addition to the style guide too:
https://www.kernel.org/doc/html/v6.7/process/coding-style.html#printing-kernel-messages.
"When drivers are working properly, they are quiet. Prefer to use
DEBUG messages unless something is wrong."

What do you think Greg?

On Wed, Jan 24, 2024 at 6:17 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Wed, Jan 24, 2024 at 03:51:58PM +0200, Heikki Krogerus wrote:
> > On Wed, Jan 24, 2024 at 12:12:26AM -0800, Prashant Malani wrote:
> > > Hi Abhishek,
> > >
> > > On Tue, Jan 23, 2024 at 2:30 PM Abhishek Pandit-Subedi
> > > <abhishekpandit@...gle.com> wrote:
> > > >
> > > > From: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> > > >
> > > > Between UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was
> > > > increased from 16 to 256. In order to avoid overflowing reads for older
> > > > systems, add a mechanism to use the read UCSI version to truncate read
> > > > sizes on UCSI v1.2.
> > > >
> > > > Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> > > I have one nit (mentioned in side-band but reproducing here for consistency),
> > > but will defer to the maintainer on that.
> > >
> > > The above notwithstanding, FWIW:
> > > Reviewed-by: Prashant Malani<pmalani@...omium.org>
> > >
> > > > @@ -1556,6 +1569,15 @@ int ucsi_register(struct ucsi *ucsi)
> > > >         if (!ucsi->version)
> > > >                 return -ENODEV;
> > > >
> > > > +       /*
> > > > +        * Version format is JJ.M.N (JJ = Major version, M = Minor version,
> > > > +        * N = sub-minor version).
> > > > +        */
> > > > +       dev_info(ucsi->dev, "Registered UCSI interface with version %x.%x.%x",
> > > > +                UCSI_BCD_GET_MAJOR(ucsi->version),
> > > > +                UCSI_BCD_GET_MINOR(ucsi->version),
> > > > +                UCSI_BCD_GET_SUBMINOR(ucsi->version));
> > >
> > > nit: I think this doesn't need to be dev_info() and can be just
> > > dev_dbg(), but will
> > > defer to the maintainer.
> >
> > I think that's okay.
> >
> > Reviewewd-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
>
> No, when drivers are working properly they are quiet, this needs to be
> dev_dbg().
>
> thanks,
>
> greg k-h
>