RE: [PATCH 1/1] Staging: hv: Move the mouse driver out of staging

[KY Srinivasan]

> -----Original Message-----
> From: Greg KH [mailto:gregkh@xxxxxxx]
> Sent: Tuesday, November 08, 2011 7:49 PM
> To: KY Srinivasan
> Cc: Dmitry Torokhov; linux-kernel@xxxxxxxxxxxxxxx;
> devel@xxxxxxxxxxxxxxxxxxxxxx; ohering@xxxxxxxx; joe@xxxxxxxxxxx;
> jkosina@xxxxxxx
> Subject: Re: [PATCH 1/1] Staging: hv: Move the mouse driver out of staging
> 
> On Wed, Nov 09, 2011 at 12:45:30AM +0000, KY Srinivasan wrote:
> >
> >
> > > -----Original Message-----
> > > From: Dmitry Torokhov [mailto:dmitry.torokhov@xxxxxxxxx]
> > > Sent: Monday, November 07, 2011 12:51 AM
> > > To: KY Srinivasan
> > > Cc: gregkh@xxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> > > devel@xxxxxxxxxxxxxxxxxxxxxx; virtualization@xxxxxxxxxxxxxx;
> ohering@xxxxxxxx;
> > > joe@xxxxxxxxxxx; jkosina@xxxxxxx
> > > Subject: Re: [PATCH 1/1] Staging: hv: Move the mouse driver out of staging
> > >
> > > Hi K. Y,
> > >
> > > On Mon, Nov 07, 2011 at 01:04:53AM +0000, KY Srinivasan wrote:
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: Dmitry Torokhov [mailto:dmitry.torokhov@xxxxxxxxx]
> > > > > Sent: Saturday, November 05, 2011 2:48 AM
> > > > > To: KY Srinivasan
> > > > > Cc: gregkh@xxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> > > > > devel@xxxxxxxxxxxxxxxxxxxxxx; virtualization@xxxxxxxxxxxxxx;
> > > ohering@xxxxxxxx;
> > > > > joe@xxxxxxxxxxx; jkosina@xxxxxxx
> > > > > Subject: Re: [PATCH 1/1] Staging: hv: Move the mouse driver out of
> staging
> > > > >
> > > > > Hi KY,
> > > >
> > > > Dimitry,
> > > >
> > > > Let me begin by thanking you for taking the time to review. I have
> incorporated
> > > > pretty much all your suggestions.
> > >
> > > Thank you very much for considering my suggestions.
> >
> > >
> > > > >
> > > > > Instead of potentially ever-increasing buffer that you also allocate
> > > > > (and it looks like leaking on every callback invocation) can you just
> > > > > repeat the read if you know that there are more data and use single
> > > > > pre-allocated buffer?
> > > >
> > > > The ring-buffer protocol is such that we need to consume the full message.
> > > > Also, why do you say we are leaking memory?
> > >
> > > Ah, OK, I see, we keep reading until read returns 0-sized reply and then
> > > we free the buffer... Never mind then.
> > >
> > > > > > +
> > > > > > +	hid_dev->ll_driver = &mousevsc_ll_driver;
> > > > > > +	hid_dev->driver = &mousevsc_hid_driver;
> > > > >
> > > > > You are not really hid driver; you are more of a "provider" so why do
> > > > > you need to set hid_dev->driver in addition to hid_dev->ll_driver?
> > > > >
> > > > True, but hid_parse_report() expects that the driver field be set; so I
> > > > need to fake this.
> > >
> > > If you supply .parse() method for your mousevsc_ll_driver structure and
> > > call hid_parse_report() from it then HID core will set the default
> > > driver and call parse at appropriate time.
> >
> > Would it be ok if I were to make this change after Jiri accepts the driver out of
> staging?
> 
> Why not fix this now?  No need to take a driver that is known to have
> issues, right?

I am not sure what needs fixing here. I was hoping Jiri would provide some guidance here.
Jiri looked at this code and did not raise this as a problem.

Regards,

K. Y

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