media: common: saa7146: replace BUG_ON by WARN_ON

No need for BUG_ON, WARN_ON is a lot friendlier.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/common/saa7146/saa7146_core.c

@@ -37,7 +37,8 @@ void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
 {
 	u32 value = 0;
 
-	BUG_ON(port > 3);
+	if (WARN_ON(port > 3))
+		return;
 
 	value = saa7146_read(dev, GPIO_CTRL);
 	value &= ~(0xff << (8*port));
@@ -148,7 +149,8 @@ static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
 		pg = vmalloc_to_page(virt);
 		if (NULL == pg)
 			goto err;
-		BUG_ON(PageHighMem(pg));
+		if (WARN_ON(PageHighMem(pg)))
+			return NULL;
 		sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
 	}
 	return sglist;
@@ -239,8 +241,9 @@ int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt
 	int nr_pages = 0;
 	int i,p;
 
-	BUG_ON(0 == sglen);
-	BUG_ON(list->offset > PAGE_SIZE);
+	if (WARN_ON(!sglen) ||
+	    WARN_ON(list->offset > PAGE_SIZE))
+		return -EIO;
 
 	/* if we have a user buffer, the first page may not be
 	   aligned to a page boundary. */

drivers/media/common/saa7146/saa7146_fops.c

@@ -68,7 +68,8 @@ int saa7146_buffer_queue(struct saa7146_dev *dev,
 	assert_spin_locked(&dev->slock);
 	DEB_EE("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf);
 
-	BUG_ON(!q);
+	if (WARN_ON(!q))
+		return -EIO;
 
 	if (NULL == q->curr) {
 		q->curr = buf;
@@ -109,7 +110,8 @@ void saa7146_buffer_next(struct saa7146_dev *dev,
 {
 	struct saa7146_buf *buf,*next = NULL;
 
-	BUG_ON(!q);
+	if (WARN_ON(!q))
+		return;
 
 	DEB_INT("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi);
 

drivers/media/common/saa7146/saa7146_hlp.c

@@ -542,9 +542,10 @@ static int calculate_video_dma_grab_planar(struct saa7146_dev* dev, struct saa71
 	int height = pix->height;
 	enum v4l2_field field = pix->field;
 
-	BUG_ON(0 == buf->pt[0].dma);
-	BUG_ON(0 == buf->pt[1].dma);
-	BUG_ON(0 == buf->pt[2].dma);
+	if (WARN_ON(!buf->pt[0].dma) ||
+	    WARN_ON(!buf->pt[1].dma) ||
+	    WARN_ON(!buf->pt[2].dma))
+		return -1;
 
 	DEB_CAP("[size=%dx%d,fields=%s]\n",
 		width, height, v4l2_field_names[field]);