linux-kernel - Re: [PATCH 1/5] tty: Add a function to insert a string of characters with the same flag

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Date:	Sat, 27 Feb 2010 09:45:57 -0500
From:	Christopher Curtis <ccurtis0@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	Alan Cox <alan@...ux.intel.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/5] tty: Add a function to insert a string of characters 
	with the same flag

On Fri, Feb 26, 2010 at 5:11 PM, Greg KH <greg@...ah.com> wrote:
>
> On Wed, Feb 17, 2010 at 01:06:30PM +0000, Alan Cox wrote:
> > The USB drivers often want to insert a series of bytes all with the same
> > flag set - provide a helper for this case.
> >
> > Signed-off-by: Alan Cox <alan@...ux.intel.com>
> > ---
> >
> >  drivers/char/tty_buffer.c |   12 +++++++-----
> >  include/linux/tty_flip.h  |    7 ++++++-
> >  2 files changed, 13 insertions(+), 6 deletions(-)
> >
> >
> > diff --git a/drivers/char/tty_buffer.c b/drivers/char/tty_buffer.c
> > index 8402eda..af8d977 100644
> > --- a/drivers/char/tty_buffer.c
> > +++ b/drivers/char/tty_buffer.c
> > @@ -231,9 +231,10 @@ int tty_buffer_request_room(struct tty_struct *tty, size_t size)
> >  EXPORT_SYMBOL_GPL(tty_buffer_request_room);
> >
> >  /**
> > - *   tty_insert_flip_string  -       Add characters to the tty buffer
> > + *   tty_insert_flip_string_fixed_flag - Add characters to the tty buffer
> >   *   @tty: tty structure
> >   *   @chars: characters
> > + *   @flag: flag value for each character
> >   *   @size: size
> >   *
> >   *   Queue a series of bytes to the tty buffering. All the characters
> > @@ -242,18 +243,19 @@ EXPORT_SYMBOL_GPL(tty_buffer_request_room);
> >   *   Locking: Called functions may take tty->buf.lock
> >   */
> >
> > -int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars,
> > -                             size_t size)
> > +int tty_insert_flip_string_fixed_flag(struct tty_struct *tty,
> > +             const unsigned char *chars, char flag, size_t size)
> >  {
> >       int copied = 0;
> >       do {
> > +             int goal = min(size - copied, TTY_BUFFER_PAGE);
>
> This variable isn't used in this function.
>
> >               int space = tty_buffer_request_room(tty, goal);

It is used on the next line; it would appear to be a local scope alias
for some other 'goal'...?

Chris
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