linux-kernel - Re: [PATCH] drivers:staging: sources for ST core

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Message-ID: <867722.38404.qm@web94916.mail.in2.yahoo.com>
Date:	Tue, 27 Apr 2010 03:36:43 +0530 (IST)
From:	Pavan Savoy <pavan_savoy@...com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org, npelly@...gle.com
Subject: Re: [PATCH] drivers:staging: sources for ST core

Alan,

--- On Tue, 27/4/10, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> From: Alan Cox <alan@...rguk.ukuu.org.uk>
> Subject: Re: [PATCH] drivers:staging: sources for ST core
> To: pavan_savoy@...com
> Cc: gregkh@...e.de, linux-kernel@...r.kernel.org, npelly@...gle.com, pavan_savoy@...oo.co.in
> Date: Tuesday, 27 April, 2010, 3:33 AM
> 
> > +/* function pointer pointing to either,
> > + * st_kim_recv during registration to receive fw
> download responses
> > + * st_int_recv after registration to receive proto
> stack responses
> > + */
> > +void (*st_recv) (void*, const unsigned char*, long);
> 
> You still need a context of some kind as I said before to
> avoid thse
> globals and single device limits.

The st_recv is a global pointer to a function, and changes only once in lifetime of the driver (after a function called download_firmware).
This can be easily avoided by having a flag in my st_tty_recieve function, as in

if (test_bit(FIRMWARE_DOWNLOADED, st_gdata->st_state)
        /*
         * if fw download is in progress then route incoming data
         * to KIM for validation
         */
        st_int_recv(data, count);
else
        kim_recv(data, count);
        ST_DRV_VER("done %s", __func__);

However, the other global reference which was st_gdata, now is inside the tty->disc_data reference.

Should I put in the above ?

> And all the other issues - no explanation of the locking
> etc don't seem
> to have been touched either.

I have removed most un-wanted locking stuff, I could find.
What else is required ? please suggest.

> I don't really see how I am supposed to review this stuff
> when the
> locking and flow control assumptions are completely opaque

Didn't get what is that is required about flow-control ?
> Alan
> 

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