diff --git a/drivers/media/video/gspca/cpia1.c b/drivers/media/video/gspca/cpia1.c
index 4b3ea3b..3747a1d 100644
--- a/drivers/media/video/gspca/cpia1.c
+++ b/drivers/media/video/gspca/cpia1.c
@@ -1765,14 +1765,10 @@
 		atomic_set(&sd->cam_exposure, data[39] * 2);
 		atomic_set(&sd->fps, data[41]);
 
-		image = gspca_dev->image;
-		if (image == NULL) {
-			gspca_dev->last_packet_type = DISCARD_PACKET;
-			return;
-		}
-
 		/* Check for proper EOF for last frame */
-		if (gspca_dev->image_len > 4 &&
+		image = gspca_dev->image;
+		if (image != NULL &&
+		    gspca_dev->image_len > 4 &&
 		    image[gspca_dev->image_len - 4] == 0xff &&
 		    image[gspca_dev->image_len - 3] == 0xff &&
 		    image[gspca_dev->image_len - 2] == 0xff &&
diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index 2dc7270..11b0e35 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -315,8 +315,6 @@
 		urb->status = 0;
 		goto resubmit;
 	}
-	if (gspca_dev->image == NULL)
-		gspca_dev->last_packet_type = DISCARD_PACKET;
 	pkt_scan = gspca_dev->sd_desc->pkt_scan;
 	for (i = 0; i < urb->number_of_packets; i++) {
 
@@ -428,16 +426,19 @@
 
 	PDEBUG(D_PACK, "add t:%d l:%d",	packet_type, len);
 
-	/* check the availability of the frame buffer */
-	if (gspca_dev->image == NULL)
-		return;
-
 	if (packet_type == FIRST_PACKET) {
-		i = gspca_dev->fr_i;
+		i = atomic_read(&gspca_dev->fr_i);
+
+		/* if there are no queued buffer, discard the whole frame */
+		if (i == atomic_read(&gspca_dev->fr_q)) {
+			gspca_dev->last_packet_type = DISCARD_PACKET;
+			return;
+		}
 		j = gspca_dev->fr_queue[i];
 		frame = &gspca_dev->frame[j];
 		frame->v4l2_buf.timestamp = ktime_to_timeval(ktime_get());
 		frame->v4l2_buf.sequence = ++gspca_dev->sequence;
+		gspca_dev->image = frame->data;
 		gspca_dev->image_len = 0;
 	} else if (gspca_dev->last_packet_type == DISCARD_PACKET) {
 		if (packet_type == LAST_PACKET)
@@ -460,31 +461,24 @@
 	}
 	gspca_dev->last_packet_type = packet_type;
 
-	/* if last packet, wake up the application and advance in the queue */
+	/* if last packet, invalidate packet concatenation until
+	 * next first packet, wake up the application and advance
+	 * in the queue */
 	if (packet_type == LAST_PACKET) {
-		i = gspca_dev->fr_i;
+		i = atomic_read(&gspca_dev->fr_i);
 		j = gspca_dev->fr_queue[i];
 		frame = &gspca_dev->frame[j];
 		frame->v4l2_buf.bytesused = gspca_dev->image_len;
 		frame->v4l2_buf.flags = (frame->v4l2_buf.flags
 					 | V4L2_BUF_FLAG_DONE)
 					& ~V4L2_BUF_FLAG_QUEUED;
+		i = (i + 1) % GSPCA_MAX_FRAMES;
+		atomic_set(&gspca_dev->fr_i, i);
 		wake_up_interruptible(&gspca_dev->wq);	/* event = new frame */
-		i = (i + 1) % gspca_dev->nframes;
-		gspca_dev->fr_i = i;
-		PDEBUG(D_FRAM, "frame complete len:%d q:%d i:%d o:%d",
-			frame->v4l2_buf.bytesused,
-			gspca_dev->fr_q,
-			i,
-			gspca_dev->fr_o);
-		j = gspca_dev->fr_queue[i];
-		frame = &gspca_dev->frame[j];
-		if ((frame->v4l2_buf.flags & BUF_ALL_FLAGS)
-					== V4L2_BUF_FLAG_QUEUED) {
-			gspca_dev->image = frame->data;
-		} else {
-			gspca_dev->image = NULL;
-		}
+		PDEBUG(D_FRAM, "frame complete len:%d",
+			frame->v4l2_buf.bytesused);
+		gspca_dev->image = NULL;
+		gspca_dev->image_len = 0;
 	}
 }
 EXPORT_SYMBOL(gspca_frame_add);
@@ -514,8 +508,8 @@
 	PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
 	frsz = PAGE_ALIGN(frsz);
 	gspca_dev->frsz = frsz;
-	if (count > GSPCA_MAX_FRAMES)
-		count = GSPCA_MAX_FRAMES;
+	if (count >= GSPCA_MAX_FRAMES)
+		count = GSPCA_MAX_FRAMES - 1;
 	gspca_dev->frbuf = vmalloc_32(frsz * count);
 	if (!gspca_dev->frbuf) {
 		err("frame alloc failed");
@@ -534,11 +528,9 @@
 		frame->data = gspca_dev->frbuf + i * frsz;
 		frame->v4l2_buf.m.offset = i * frsz;
 	}
-	gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
-	gspca_dev->image = NULL;
-	gspca_dev->image_len = 0;
-	gspca_dev->last_packet_type = DISCARD_PACKET;
-	gspca_dev->sequence = 0;
+	atomic_set(&gspca_dev->fr_q, 0);
+	atomic_set(&gspca_dev->fr_i, 0);
+	gspca_dev->fr_o = 0;
 	return 0;
 }
 
@@ -776,6 +768,12 @@
 		goto out;
 	}
 
+	/* reset the streaming variables */
+	gspca_dev->image = NULL;
+	gspca_dev->image_len = 0;
+	gspca_dev->last_packet_type = DISCARD_PACKET;
+	gspca_dev->sequence = 0;
+
 	gspca_dev->usb_err = 0;
 
 	/* set the higher alternate setting and
@@ -1591,7 +1589,7 @@
 				enum v4l2_buf_type buf_type)
 {
 	struct gspca_dev *gspca_dev = priv;
-	int i, ret;
+	int ret;
 
 	if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 		return -EINVAL;
@@ -1615,12 +1613,10 @@
 	gspca_stream_off(gspca_dev);
 	mutex_unlock(&gspca_dev->usb_lock);
 
-	/* empty the application queues */
-	for (i = 0; i < gspca_dev->nframes; i++)
-		gspca_dev->frame[i].v4l2_buf.flags &= ~BUF_ALL_FLAGS;
-	gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
-	gspca_dev->last_packet_type = DISCARD_PACKET;
-	gspca_dev->sequence = 0;
+	/* empty the transfer queues */
+	atomic_set(&gspca_dev->fr_q, 0);
+	atomic_set(&gspca_dev->fr_i, 0);
+	gspca_dev->fr_o = 0;
 	ret = 0;
 out:
 	mutex_unlock(&gspca_dev->queue_lock);
@@ -1697,7 +1693,7 @@
 	int n;
 
 	n = parm->parm.capture.readbuffers;
-	if (n == 0 || n > GSPCA_MAX_FRAMES)
+	if (n == 0 || n >= GSPCA_MAX_FRAMES)
 		parm->parm.capture.readbuffers = gspca_dev->nbufread;
 	else
 		gspca_dev->nbufread = n;
@@ -1800,21 +1796,17 @@
 static int frame_wait(struct gspca_dev *gspca_dev,
 			int nonblock_ing)
 {
-	struct gspca_frame *frame;
-	int i, j, ret;
+	int i, ret;
 
 	/* check if a frame is ready */
 	i = gspca_dev->fr_o;
-	j = gspca_dev->fr_queue[i];
-	frame = &gspca_dev->frame[j];
-
-	if (!(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE)) {
+	if (i == atomic_read(&gspca_dev->fr_i)) {
 		if (nonblock_ing)
 			return -EAGAIN;
 
 		/* wait till a frame is ready */
 		ret = wait_event_interruptible_timeout(gspca_dev->wq,
-			(frame->v4l2_buf.flags & V4L2_BUF_FLAG_DONE) ||
+			i != atomic_read(&gspca_dev->fr_i) ||
 			!gspca_dev->streaming || !gspca_dev->present,
 			msecs_to_jiffies(3000));
 		if (ret < 0)
@@ -1823,11 +1815,7 @@
 			return -EIO;
 	}
 
-	gspca_dev->fr_o = (i + 1) % gspca_dev->nframes;
-	PDEBUG(D_FRAM, "frame wait q:%d i:%d o:%d",
-		gspca_dev->fr_q,
-		gspca_dev->fr_i,
-		gspca_dev->fr_o);
+	gspca_dev->fr_o = (i + 1) % GSPCA_MAX_FRAMES;
 
 	if (gspca_dev->sd_desc->dq_callback) {
 		mutex_lock(&gspca_dev->usb_lock);
@@ -1836,7 +1824,7 @@
 			gspca_dev->sd_desc->dq_callback(gspca_dev);
 		mutex_unlock(&gspca_dev->usb_lock);
 	}
-	return j;
+	return gspca_dev->fr_queue[i];
 }
 
 /*
@@ -1941,15 +1929,9 @@
 	}
 
 	/* put the buffer in the 'queued' queue */
-	i = gspca_dev->fr_q;
+	i = atomic_read(&gspca_dev->fr_q);
 	gspca_dev->fr_queue[i] = index;
-	if (gspca_dev->fr_i == i)
-		gspca_dev->image = frame->data;
-	gspca_dev->fr_q = (i + 1) % gspca_dev->nframes;
-	PDEBUG(D_FRAM, "qbuf q:%d i:%d o:%d",
-		gspca_dev->fr_q,
-		gspca_dev->fr_i,
-		gspca_dev->fr_o);
+	atomic_set(&gspca_dev->fr_q, (i + 1) % GSPCA_MAX_FRAMES);
 
 	v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
 	v4l2_buf->flags &= ~V4L2_BUF_FLAG_DONE;
@@ -2005,7 +1987,7 @@
 static unsigned int dev_poll(struct file *file, poll_table *wait)
 {
 	struct gspca_dev *gspca_dev = file->private_data;
-	int i, ret;
+	int ret;
 
 	PDEBUG(D_FRAM, "poll");
 
@@ -2023,11 +2005,9 @@
 	if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
 		return POLLERR;
 
-	/* check the next incoming buffer */
-	i = gspca_dev->fr_o;
-	i = gspca_dev->fr_queue[i];
-	if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
-		ret = POLLIN | POLLRDNORM;	/* something to read */
+	/* check if an image has been received */
+	if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))
+		ret = POLLIN | POLLRDNORM;	/* yes */
 	else
 		ret = 0;
 	mutex_unlock(&gspca_dev->queue_lock);
diff --git a/drivers/media/video/gspca/gspca.h b/drivers/media/video/gspca/gspca.h
index 453e43d..17e5558 100644
--- a/drivers/media/video/gspca/gspca.h
+++ b/drivers/media/video/gspca/gspca.h
@@ -178,11 +178,11 @@
 	u8 *image;				/* image beeing filled */
 	__u32 frsz;				/* frame size */
 	u32 image_len;				/* current length of image */
-	char nframes;				/* number of frames */
-	char fr_i;				/* frame being filled */
-	char fr_q;				/* next frame to queue */
-	char fr_o;				/* next frame to dequeue */
+	atomic_t fr_q;				/* next frame to queue */
+	atomic_t fr_i;				/* frame being filled */
 	signed char fr_queue[GSPCA_MAX_FRAMES];	/* frame queue */
+	char nframes;				/* number of frames */
+	u8 fr_o;				/* next frame to dequeue */
 	__u8 last_packet_type;
 	__s8 empty_packet;		/* if (-1) don't check empty packets */
 	__u8 streaming;
diff --git a/drivers/media/video/gspca/m5602/m5602_core.c b/drivers/media/video/gspca/m5602/m5602_core.c
index 0c4ad5a..b073d66 100644
--- a/drivers/media/video/gspca/m5602/m5602_core.c
+++ b/drivers/media/video/gspca/m5602/m5602_core.c
@@ -307,11 +307,6 @@
 	} else {
 		int cur_frame_len;
 
-		if (gspca_dev->image == NULL) {
-			gspca_dev->last_packet_type = DISCARD_PACKET;
-			return;
-		}
-
 		cur_frame_len = gspca_dev->image_len;
 		/* Remove urb header */
 		data += 4;
diff --git a/drivers/media/video/gspca/ov534.c b/drivers/media/video/gspca/ov534.c
index 84c9b8d..96cb3a9 100644
--- a/drivers/media/video/gspca/ov534.c
+++ b/drivers/media/video/gspca/ov534.c
@@ -988,8 +988,6 @@
 		/* If this packet is marked as EOF, end the frame */
 		} else if (data[1] & UVC_STREAM_EOF) {
 			sd->last_pts = 0;
-			if (gspca_dev->image == NULL)
-				goto discard;
 			if (gspca_dev->image_len + len - 12 !=
 			    gspca_dev->width * gspca_dev->height * 2) {
 				PDEBUG(D_PACK, "wrong sized frame");
diff --git a/drivers/media/video/gspca/pac7302.c b/drivers/media/video/gspca/pac7302.c
index 88cc03b..a66df07 100644
--- a/drivers/media/video/gspca/pac7302.c
+++ b/drivers/media/video/gspca/pac7302.c
@@ -835,12 +835,6 @@
 	if (sof) {
 		int n, lum_offset, footer_length;
 
-		image = gspca_dev->image;
-		if (image == NULL) {
-			gspca_dev->last_packet_type = DISCARD_PACKET;
-			return;
-		}
-
 		/* 6 bytes after the FF D9 EOF marker a number of lumination
 		   bytes are send corresponding to different parts of the
 		   image, the 14th and 15th byte after the EOF seem to
@@ -856,7 +850,9 @@
 		} else {
 			gspca_frame_add(gspca_dev, INTER_PACKET, data, n);
 		}
-		if (gspca_dev->last_packet_type != DISCARD_PACKET
+
+		image = gspca_dev->image;
+		if (image != NULL
 		 && image[gspca_dev->image_len - 2] == 0xff
 		 && image[gspca_dev->image_len - 1] == 0xd9)
 			gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
diff --git a/drivers/media/video/gspca/pac7311.c b/drivers/media/video/gspca/pac7311.c
index 5568c41..1cb7e99e 100644
--- a/drivers/media/video/gspca/pac7311.c
+++ b/drivers/media/video/gspca/pac7311.c
@@ -630,12 +630,6 @@
 	if (sof) {
 		int n, lum_offset, footer_length;
 
-		image = gspca_dev->image;
-		if (image == NULL) {
-			gspca_dev->last_packet_type = DISCARD_PACKET;
-			return;
-		}
-
 		/* 6 bytes after the FF D9 EOF marker a number of lumination
 		   bytes are send corresponding to different parts of the
 		   image, the 14th and 15th byte after the EOF seem to
@@ -651,7 +645,8 @@
 		} else {
 			gspca_frame_add(gspca_dev, INTER_PACKET, data, n);
 		}
-		if (gspca_dev->last_packet_type != DISCARD_PACKET
+		image = gspca_dev->image;
+		if (image != NULL
 		 && image[gspca_dev->image_len - 2] == 0xff
 		 && image[gspca_dev->image_len - 1] == 0xd9)
 			gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
diff --git a/drivers/media/video/gspca/sonixb.c b/drivers/media/video/gspca/sonixb.c
index 4989a2c..204bb3a 100644
--- a/drivers/media/video/gspca/sonixb.c
+++ b/drivers/media/video/gspca/sonixb.c
@@ -1254,10 +1254,6 @@
 		int used;
 		int size = cam->cam_mode[gspca_dev->curr_mode].sizeimage;
 
-		if (gspca_dev->image == NULL) {
-			gspca_dev->last_packet_type = DISCARD_PACKET;
-			return;
-		}
 		used = gspca_dev->image_len;
 		if (used + len > size)
 			len = size - used;
diff --git a/drivers/media/video/gspca/vc032x.c b/drivers/media/video/gspca/vc032x.c
index 0a7d1e0..82be169 100644
--- a/drivers/media/video/gspca/vc032x.c
+++ b/drivers/media/video/gspca/vc032x.c
@@ -3728,10 +3728,6 @@
 	if (sd->bridge == BRIDGE_VC0321) {
 		int size, l;
 
-		if (gspca_dev->image == NULL) {
-			gspca_dev->last_packet_type = DISCARD_PACKET;
-			return;
-		}
 		l = gspca_dev->image_len;
 		size = gspca_dev->frsz;
 		if (len > size - l)