OSS: dmabuf: fix negative DMAbuf_get_buffer_pointer() check

Since unsigned active_offs < 0 is even true when DMAbuf_get_buffer_pointer()
returns negative

Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c
index eaf6997..1e90d76 100644 (file)
--- a/sound/oss/dmabuf.c
+++ b/sound/oss/dmabuf.c
@@ -795,9 +795,9 @@ static int find_output_space(int dev, char **buf, int *size)
 #ifdef BE_CONSERVATIVE
        active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size;
 #else
-       active_offs = DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT);
+       active_offs = max(DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT), 0);
        /* Check for pointer wrapping situation */
-       if (active_offs < 0 || active_offs >= dmap->bytes_in_use)
+       if (active_offs >= dmap->bytes_in_use)
                active_offs = 0;
        active_offs += dmap->byte_counter;
 #endif