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 19:32:33 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
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

Was it really the 17th I sent the second set out - apparently so - so
ignore the first email, this is the correct patch set.

> > +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);

Its used here. The logic basically is

goal =  {	I want a buffer to hold "size - copied" 
	{	I want it to fit in one page

space = 	what I get back

we copy space and move on based on what we get back, so it looks correct
to me.

> >  		memcpy(tb->char_buf_ptr + tb->used, chars, space);
> > -		memset(tb->flag_buf_ptr + tb->used, TTY_NORMAL, space);
> > +		memset(tb->flag_buf_ptr + tb->used, flag, space);
> 
> Should you have "goal" here instead of "space"?

No because we could ask for say 500 and get 250 back, we then want to
copy 250.


Alan
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