V4L/DVB (7854): cx18/ivtv: improve and fix out-of-memory handling

- don't show kernel backtrace when the allocation of the buffers fails: the
  normal ivtv/cx18 messages are clear enough and the backtrace scares users.
- fix cleanup after the buffer allocation fails (caused kernel panic).

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

6 files changed, 23 insertions, 16 deletions

diff --git a/drivers/media/video/ivtv/ivtv-driver.c b/drivers/media/video/ivtv/ivtv-driver.c
index a0756a9235d8..797e636771da 100644
--- a/drivers/media/video/ivtv/ivtv-driver.c
+++ b/drivers/media/video/ivtv/ivtv-driver.c
@@ -1232,7 +1232,7 @@ static int __devinit ivtv_probe(struct pci_dev *dev,
 	return 0;
 
 free_streams:
-	ivtv_streams_cleanup(itv);
+	ivtv_streams_cleanup(itv, 1);
 free_irq:
 	free_irq(itv->dev->irq, (void *)itv);
 free_i2c:
@@ -1377,7 +1377,7 @@ static void ivtv_remove(struct pci_dev *pci_dev)
 	flush_workqueue(itv->irq_work_queues);
 	destroy_workqueue(itv->irq_work_queues);
 
-	ivtv_streams_cleanup(itv);
+	ivtv_streams_cleanup(itv, 1);
 	ivtv_udma_free(itv);
 
 	exit_ivtv_i2c(itv);
diff --git a/drivers/media/video/ivtv/ivtv-queue.c b/drivers/media/video/ivtv/ivtv-queue.c
index 3e1deec67a5e..fc8b1eaa333b 100644
--- a/drivers/media/video/ivtv/ivtv-queue.c
+++ b/drivers/media/video/ivtv/ivtv-queue.c
@@ -203,14 +203,14 @@ int ivtv_stream_alloc(struct ivtv_stream *s)
 		s->dma != PCI_DMA_NONE ? "DMA " : "",
 		s->name, s->buffers, s->buf_size, s->buffers * s->buf_size / 1024);
 
-	s->sg_pending = kzalloc(SGsize, GFP_KERNEL);
+	s->sg_pending = kzalloc(SGsize, GFP_KERNEL|__GFP_NOWARN);
 	if (s->sg_pending == NULL) {
 		IVTV_ERR("Could not allocate sg_pending for %s stream\n", s->name);
 		return -ENOMEM;
 	}
 	s->sg_pending_size = 0;
 
-	s->sg_processing = kzalloc(SGsize, GFP_KERNEL);
+	s->sg_processing = kzalloc(SGsize, GFP_KERNEL|__GFP_NOWARN);
 	if (s->sg_processing == NULL) {
 		IVTV_ERR("Could not allocate sg_processing for %s stream\n", s->name);
 		kfree(s->sg_pending);
@@ -219,7 +219,8 @@ int ivtv_stream_alloc(struct ivtv_stream *s)
 	}
 	s->sg_processing_size = 0;
 
-	s->sg_dma = kzalloc(sizeof(struct ivtv_sg_element), GFP_KERNEL);
+	s->sg_dma = kzalloc(sizeof(struct ivtv_sg_element),
+					GFP_KERNEL|__GFP_NOWARN);
 	if (s->sg_dma == NULL) {
 		IVTV_ERR("Could not allocate sg_dma for %s stream\n", s->name);
 		kfree(s->sg_pending);
@@ -235,11 +236,12 @@ int ivtv_stream_alloc(struct ivtv_stream *s)
 
 	/* allocate stream buffers. Initially all buffers are in q_free. */
 	for (i = 0; i < s->buffers; i++) {
-		struct ivtv_buffer *buf = kzalloc(sizeof(struct ivtv_buffer), GFP_KERNEL);
+		struct ivtv_buffer *buf = kzalloc(sizeof(struct ivtv_buffer),
+						GFP_KERNEL|__GFP_NOWARN);
 
 		if (buf == NULL)
 			break;
-		buf->buf = kmalloc(s->buf_size + 256, GFP_KERNEL);
+		buf->buf = kmalloc(s->buf_size + 256, GFP_KERNEL|__GFP_NOWARN);
 		if (buf->buf == NULL) {
 			kfree(buf);
 			break;
diff --git a/drivers/media/video/ivtv/ivtv-streams.c b/drivers/media/video/ivtv/ivtv-streams.c
index 4ab8d36831ba..c47c2b945147 100644
--- a/drivers/media/video/ivtv/ivtv-streams.c
+++ b/drivers/media/video/ivtv/ivtv-streams.c
@@ -244,7 +244,7 @@ int ivtv_streams_setup(struct ivtv *itv)
 		return 0;
 
 	/* One or more streams could not be initialized. Clean 'em all up. */
-	ivtv_streams_cleanup(itv);
+	ivtv_streams_cleanup(itv, 0);
 	return -ENOMEM;
 }
 
@@ -304,12 +304,12 @@ int ivtv_streams_register(struct ivtv *itv)
 		return 0;
 
 	/* One or more streams could not be initialized. Clean 'em all up. */
-	ivtv_streams_cleanup(itv);
+	ivtv_streams_cleanup(itv, 1);
 	return -ENOMEM;
 }
 
 /* Unregister v4l2 devices */
-void ivtv_streams_cleanup(struct ivtv *itv)
+void ivtv_streams_cleanup(struct ivtv *itv, int unregister)
 {
 	int type;
 
@@ -322,8 +322,11 @@ void ivtv_streams_cleanup(struct ivtv *itv)
 			continue;
 
 		ivtv_stream_free(&itv->streams[type]);
-		/* Unregister device */
-		video_unregister_device(vdev);
+		/* Unregister or release device */
+		if (unregister)
+			video_unregister_device(vdev);
+		else
+			video_device_release(vdev);
 	}
 }
 
diff --git a/drivers/media/video/ivtv/ivtv-streams.h b/drivers/media/video/ivtv/ivtv-streams.h
index 3d76a415fbd8..a653a5136417 100644
--- a/drivers/media/video/ivtv/ivtv-streams.h
+++ b/drivers/media/video/ivtv/ivtv-streams.h
@@ -23,7 +23,7 @@
 
 int ivtv_streams_setup(struct ivtv *itv);
 int ivtv_streams_register(struct ivtv *itv);
-void ivtv_streams_cleanup(struct ivtv *itv);
+void ivtv_streams_cleanup(struct ivtv *itv, int unregister);
 
 /* Capture related */
 int ivtv_start_v4l2_encode_stream(struct ivtv_stream *s);
diff --git a/drivers/media/video/ivtv/ivtv-yuv.c b/drivers/media/video/ivtv/ivtv-yuv.c
index 62f70bd5e3cb..a9417f6e4087 100644
--- a/drivers/media/video/ivtv/ivtv-yuv.c
+++ b/drivers/media/video/ivtv/ivtv-yuv.c
@@ -908,7 +908,7 @@ static void ivtv_yuv_init(struct ivtv *itv)
 	}
 
 	/* We need a buffer for blanking when Y plane is offset - non-fatal if we can't get one */
-	yi->blanking_ptr = kzalloc(720 * 16, GFP_KERNEL);
+	yi->blanking_ptr = kzalloc(720 * 16, GFP_KERNEL|__GFP_NOWARN);
 	if (yi->blanking_ptr) {
 		yi->blanking_dmaptr = pci_map_single(itv->dev, yi->blanking_ptr, 720*16, PCI_DMA_TODEVICE);
 	} else {
diff --git a/drivers/media/video/ivtv/ivtvfb.c b/drivers/media/video/ivtv/ivtvfb.c
index df789f683e63..73be154f7f05 100644
--- a/drivers/media/video/ivtv/ivtvfb.c
+++ b/drivers/media/video/ivtv/ivtvfb.c
@@ -948,7 +948,8 @@ static int ivtvfb_init_vidmode(struct ivtv *itv)
 	}
 
 	/* Allocate the pseudo palette */
-	oi->ivtvfb_info.pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
+	oi->ivtvfb_info.pseudo_palette =
+		kmalloc(sizeof(u32) * 16, GFP_KERNEL|__GFP_NOWARN);
 
 	if (!oi->ivtvfb_info.pseudo_palette) {
 		IVTVFB_ERR("abort, unable to alloc pseudo pallete\n");
@@ -1056,7 +1057,8 @@ static int ivtvfb_init_card(struct ivtv *itv)
 		return -EBUSY;
 	}
 
-	itv->osd_info = kzalloc(sizeof(struct osd_info), GFP_ATOMIC);
+	itv->osd_info = kzalloc(sizeof(struct osd_info),
+					GFP_ATOMIC|__GFP_NOWARN);
 	if (itv->osd_info == NULL) {
 		IVTVFB_ERR("Failed to allocate memory for osd_info\n");
 		return -ENOMEM;