Re: [PATCH v1] Input: elants_i2c: Add Elan touchscreen support

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Thu, Nov 20, 2014 at 09:27:35PM +0100, Oliver Neukum wrote:
> On Thu, 2014-11-20 at 09:47 -0800, Dmitry Torokhov wrote:
> > Hi Oliver,
> > 
> > On Thu, Nov 20, 2014 at 11:31:30AM +0100, Oliver Neukum wrote:
> > > > +static int elants_i2c_initialize(struct elants_data *ts)
> > > > +{
> > > > +       struct i2c_client *client = ts->client;
> > > > +       int error, retry_cnt;
> > > > +       const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 };
> > > > +       const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 };
> > > > +       u8 buf[HEADER_SIZE];
> > > > +
> > > 
> > > Strictly speaking you should disable preemption here.
> > 
> > Umm, why?
> 
> You said the upper bound matters. So you need to protect yourself
> against losing too much time by preemption.

We are using i2c so we can't really disable preemption here... I think
we  have enough slack, although I would indeed lower the sleep time.
I'll let Scott comment on that.

Thanks.

-- 
Dmitry