From e2d71728bcc72b8dc1cb726c222756c14e113794 Mon Sep 17 00:00:00 2001
From: Gerd Knorr <devnull@localhost>
Date: Tue, 31 Aug 2004 14:46:49 +0000
Subject: - cx88: make cx88_wakeup() work correctly after waking 2^16 buffers.

---
 linux/drivers/media/video/cx88/cx88-core.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'linux/drivers/media')

diff --git a/linux/drivers/media/video/cx88/cx88-core.c b/linux/drivers/media/video/cx88/cx88-core.c
index eaee42b9d..935234201 100644
--- a/linux/drivers/media/video/cx88/cx88-core.c
+++ b/linux/drivers/media/video/cx88/cx88-core.c
@@ -592,8 +592,16 @@ void cx88_wakeup(struct cx88_core *core,
 			break;
 		buf = list_entry(q->active.next,
 				 struct cx88_buffer, vb.queue);
+#if 0
 		if (buf->count > count)
 			break;
+#else
+		/* count comes from the hw and is is 16bit wide --
+		 * this trick is taken from the time_after() macro and
+		 * hopefully handles wrap-arounds correctly ... */
+		if ((s16)count - (s16)buf->count < 0)
+			break;
+#endif
 		do_gettimeofday(&buf->vb.ts);
 		dprintk(2,"[%p/%d] wakeup reg=%d buf=%d\n",buf,buf->vb.i,
 			count, buf->count);
-- 
cgit v1.2.3