On 14 February 2019 14:30, Greg KH wrote:
> On Thu, Feb 14, 2019 at 02:17:14PM +0000, Adam Thomson wrote:
> > On 12 February 2019 16:20, Guenter Roeck wrote:
> >
> > > On 2/12/19 2:54 AM, Greg KH wrote:
> > > > On Tue, Feb 12, 2019 at 06:29:39PM +0800, Kyle Tso wrote:
> > > >> On Thu, Jan 31, 2019 at 3:02 PM Greg KH
> > > >> <gregkh@xxxxxxxxxxxxxxxxxxx>
> > > wrote:
> > > >>
> > > >>> On Thu, Jan 31, 2019 at 11:54:11AM +0800, Kyle Tso wrote:
> > > >>>> Provide a function to get the partner Source Capabilities.
> > > >>>>
> > > >>>> Signed-off-by: Kyle Tso <kyletso@xxxxxxxxxx>
> > > >>>> ---
> > > >>>> drivers/usb/typec/tcpm/tcpm.c | 23 +++++++++++++++++++++++
> > > >>>> include/linux/usb/tcpm.h | 1 +
> > > >>>> 2 files changed, 24 insertions(+)
> > > >>>>
> > > >>>> diff --git a/drivers/usb/typec/tcpm/tcpm.c
> > > >>> b/drivers/usb/typec/tcpm/tcpm.c
> > > >>>> index f1d3e54210df..29cd84ba9960 100644
> > > >>>> --- a/drivers/usb/typec/tcpm/tcpm.c
> > > >>>> +++ b/drivers/usb/typec/tcpm/tcpm.c
> > > >>>> @@ -4494,6 +4494,29 @@ int tcpm_update_sink_capabilities(struct
> > > >>> tcpm_port *port, const u32 *pdo,
> > > >>>> }
> > > >>>> EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities);
> > > >>>>
> > > >>>> +/*
> > > >>>> + * Don't call this function in interrupt context. Caller needs
> > > >>>> +to free
> > > >>> the
> > > >>>> + * memory itself.
> > > >>>> + */
> > > >>>> +int tcpm_get_partner_src_caps(struct tcpm_port *port, u32
> > > >>>> +**src_pdo) {
> > > >>>> + unsigned int nr_pdo;
> > > >>>> +
> > > >>>> + if (port->nr_source_caps == 0)
> > > >>>> + return -ENODATA;
> > > >>>> +
> > > >>>> + *src_pdo = kcalloc(port->nr_source_caps, sizeof(u32),
> GFP_KERNEL);
> > > >>>> + if (!src_pdo)
> > > >>>> + return -ENOMEM;
> > > >>>> +
> > > >>>> + mutex_lock(&port->lock);
> > > >>>> + nr_pdo = tcpm_copy_pdos(*src_pdo, port->source_caps,
> > > >>>> + port->nr_source_caps);
> > > >>>> + mutex_unlock(&port->lock);
> > > >>>> + return nr_pdo;
> > > >>>> +}
> > > >>>> +EXPORT_SYMBOL_GPL(tcpm_get_partner_src_caps);
> > > >>>
> > > >>> We don't add new functions that no one uses :(
> > > >>>
> > > >>>
> > > >> This function is useful if the PD Device Policy Manager is
> > > >> implemented outside of TCPM.
> > > >> In this situation, Device Policy Manager needs to know the
> > > >> partner capabilities to optimize the charging process.
> > > >
> > > > And where is that code?
> > > >
> > >
> > > Agreed - that code should be sent upstream as well to let us see the
> > > entire context.
> > >
> > > >> Take existing functions in TCPM for example:
> > > >> Function "tcpm_update_sink_capabilities" and
> > > >> "tcpm_update_source_capabilities" are exposed as well. And no one
> > > >> uses them now.
> > > >
> > > > Great, let's go delete them now, we should not have apis that no
> > > > one uses. This isn't a new thing...
> > > >
> > >
> > > I sent a patch to do just that. Quite frankly I don't recal why I
> > > thought those functions might be needed.
> >
> > As a mind jog - https://lkml.org/lkml/2017/11/27/1256 :)
>
> Nice find :)
>
> Given that no one used these functions in over a year, we should be safe
> deleting them. If not, it's trivial to do 'git revert'.
Yep, agreed.
