V4L/DVB (8088): ivtv: yuv decoder lock fix

write() operations to the yuv device may not always 'start' the decoder.
Although yuv output will be correct, some functions which should be disabled
while the decoder is in use remain enabled. This can result in hardware
registers being corrupted, causing problems with the mpeg decoder. This patch
simply moves the existing decoder 'start' sequence to earlier in the write()
handler.

Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/ivtv/ivtv-fileops.c

@@ -582,6 +582,19 @@ ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t c
 	ivtv_queue_init(&q);
 	set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 
+	/* Start decoder (returns 0 if already started) */
+	mutex_lock(&itv->serialize_lock);
+	rc = ivtv_start_decoding(id, itv->speed);
+	mutex_unlock(&itv->serialize_lock);
+	if (rc) {
+		IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
+
+		/* failure, clean up */
+		clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
+		clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
+		return rc;
+	}
+
 retry:
 	/* If possible, just DMA the entire frame - Check the data transfer size
 	since we may get here before the stream has been fully set-up */
@@ -664,18 +677,6 @@ retry:
 		ivtv_enqueue(s, buf, &s->q_full);
 	}
 
-	/* Start decoder (returns 0 if already started) */
-	mutex_lock(&itv->serialize_lock);
-	rc = ivtv_start_decoding(id, itv->speed);
-	mutex_unlock(&itv->serialize_lock);
-	if (rc) {
-		IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
-
-		/* failure, clean up */
-		clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
-		clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
-		return rc;
-	}
 	if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
 		if (s->q_full.length >= itv->dma_data_req_size) {
 			int got_sig;