diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2013-06-15 13:36:02 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-23 23:47:07 (GMT) |
| commit | 1cef50e317c3395c6e8451f2b82a155db6ef2b42 (patch) | |
| tree | 5721c11c135878e4806b118b5cef5dc407e1b9b7 /drivers/tty/tty_buffer.c | |
| parent | 1fc359fc3ea72314cc3ebdfa94c60e020c152cd2 (diff) | |
| download | linux-1cef50e317c3395c6e8451f2b82a155db6ef2b42.tar.xz | |
tty: Fix flip buffer free list
Since flip buffers are size-aligned to 256 bytes and all flip
buffers 512-bytes or larger are not added to the free list, the
free list only contains 256-byte flip buffers.
Remove the list search when allocating a new flip buffer.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_buffer.c')
| -rw-r--r-- | drivers/tty/tty_buffer.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index 170674c..a5e3962 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -18,6 +18,10 @@ #include <linux/module.h> #include <linux/ratelimit.h> + +#define MIN_TTYB_SIZE 256 +#define TTYB_ALIGN_MASK 255 + /** * tty_buffer_free_all - free buffers used by a tty * @tty: tty to free from @@ -94,7 +98,7 @@ static void tty_buffer_free(struct tty_port *port, struct tty_buffer *b) buf->memory_used -= b->size; WARN_ON(buf->memory_used < 0); - if (b->size >= 512) + if (b->size > MIN_TTYB_SIZE) kfree(b); else { b->next = buf->free; @@ -176,9 +180,10 @@ void tty_buffer_flush(struct tty_struct *tty) static struct tty_buffer *tty_buffer_find(struct tty_port *port, size_t size) { struct tty_buffer **tbh = &port->buf.free; - while ((*tbh) != NULL) { - struct tty_buffer *t = *tbh; - if (t->size >= size) { + if (size <= MIN_TTYB_SIZE) { + if (*tbh) { + struct tty_buffer *t = *tbh; + *tbh = t->next; t->next = NULL; t->used = 0; @@ -187,10 +192,9 @@ static struct tty_buffer *tty_buffer_find(struct tty_port *port, size_t size) port->buf.memory_used += t->size; return t; } - tbh = &((*tbh)->next); } /* Round the buffer size out */ - size = (size + 0xFF) & ~0xFF; + size = __ALIGN_MASK(size, TTYB_ALIGN_MASK); return tty_buffer_alloc(port, size); /* Should possibly check if this fails for the largest buffer we have queued and recycle that ? */ |