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uml: console driver cleanups 

Console driver cleanups -
	Changed an instance of foo = bar + foo to foo += bar
	Removed checks of tty->stopped - I don't think the low-level
driver has any business looking at that
	Removed an annoying warning

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2008-02-04 22:30:42 -08:00 committed by Linus Torvalds
parent 054211acad
commit acb2cf34cf
1 changed files with 2 additions and 17 deletions
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19
arch/um/drivers/line.c
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@ -48,7 +48,7 @@ static int write_room(struct line *line)
n = line->head - line->tail;
if (n <= 0)
n = LINE_BUFSIZE + n; /* The other case */
n += LINE_BUFSIZE; /* The other case */
return n - 1;
}
@ -58,17 +58,10 @@ int line_write_room(struct tty_struct *tty)
unsigned long flags;
int room;
if (tty->stopped)
return 0;
spin_lock_irqsave(&line->lock, flags);
room = write_room(line);
spin_unlock_irqrestore(&line->lock, flags);
/*XXX: Warning to remove */
if (0 == room)
printk(KERN_DEBUG "%s: %s: no room left in buffer\n",
__FUNCTION__,tty->name);
return room;
}
@ -79,8 +72,7 @@ int line_chars_in_buffer(struct tty_struct *tty)
int ret;
spin_lock_irqsave(&line->lock, flags);
/*write_room subtracts 1 for the needed NULL, so we readd it.*/
/* write_room subtracts 1 for the needed NULL, so we readd it.*/
ret = LINE_BUFSIZE - (write_room(line) + 1);
spin_unlock_irqrestore(&line->lock, flags);
@ -184,10 +176,6 @@ void line_flush_buffer(struct tty_struct *tty)
unsigned long flags;
int err;
/*XXX: copied from line_write, verify if it is correct!*/
if (tty->stopped)
return;
spin_lock_irqsave(&line->lock, flags);
err = flush_buffer(line);
spin_unlock_irqrestore(&line->lock, flags);
@ -213,9 +201,6 @@ int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
unsigned long flags;
int n, ret = 0;
if (tty->stopped)
return 0;
spin_lock_irqsave(&line->lock, flags);
if (line->head != line->tail)
ret = buffer_data(line, buf, len);