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tty: Factor flip buffer initialization into helper function

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Factor shared code; prepare for adding 0-sized sentinel flip buffer.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2013-06-15 09:36:03 -04:00 committed by Greg Kroah-Hartman
parent 1cef50e317
commit 9dd5139f97
1 changed files with 12 additions and 9 deletions
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21
drivers/tty/tty_buffer.c
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@ -22,6 +22,15 @@
#define MIN_TTYB_SIZE 256
#define TTYB_ALIGN_MASK 255
static void tty_buffer_reset(struct tty_buffer *p, size_t size)
{
p->used = 0;
p->size = size;
p->next = NULL;
p->commit = 0;
p->read = 0;
}
/**
* tty_buffer_free_all - free buffers used by a tty
* @tty: tty to free from
@ -70,11 +79,8 @@ static struct tty_buffer *tty_buffer_alloc(struct tty_port *port, size_t size)
p = kmalloc(sizeof(struct tty_buffer) + 2 * size, GFP_ATOMIC);
if (p == NULL)
return NULL;
p->used = 0;
p->size = size;
p->next = NULL;
p->commit = 0;
p->read = 0;
tty_buffer_reset(p, size);
port->buf.memory_used += size;
return p;
}
@ -185,10 +191,7 @@ static struct tty_buffer *tty_buffer_find(struct tty_port *port, size_t size)
struct tty_buffer *t = *tbh;
*tbh = t->next;
t->next = NULL;
t->used = 0;
t->commit = 0;
t->read = 0;
tty_buffer_reset(t, t->size);
port->buf.memory_used += t->size;
return t;
}