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>

1 files changed, 2 insertions, 2 deletions

diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c
index eaf69971bf92..1e90d769b62e 100644
--- 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