media: go7007: use irqsave() in USB's complete callback

The USB completion callback does not disable interrupts while acquiring
the lock. We want to remove the local_irq_disable() invocation from
__usb_hcd_giveback_urb() and therefore it is required for the callback
handler to disable the interrupts while acquiring the lock.
The callback may be invoked either in IRQ or BH context depending on the
USB host controller.
Use the _irqsave() variant of the locking primitives.

Cc: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/usb/go7007/go7007-driver.c

@@ -448,13 +448,14 @@ static struct go7007_buffer *frame_boundary(struct go7007 *go, struct go7007_buf
 {
 	u32 *bytesused;
 	struct go7007_buffer *vb_tmp = NULL;
+	unsigned long flags;
 
 	if (vb == NULL) {
-		spin_lock(&go->spinlock);
+		spin_lock_irqsave(&go->spinlock, flags);
 		if (!list_empty(&go->vidq_active))
 			vb = go->active_buf =
 				list_first_entry(&go->vidq_active, struct go7007_buffer, list);
-		spin_unlock(&go->spinlock);
+		spin_unlock_irqrestore(&go->spinlock, flags);
 		go->next_seq++;
 		return vb;
 	}
@@ -468,15 +469,15 @@ static struct go7007_buffer *frame_boundary(struct go7007 *go, struct go7007_buf
 
 	vb->vb.vb2_buf.timestamp = ktime_get_ns();
 	vb_tmp = vb;
-	spin_lock(&go->spinlock);
+	spin_lock_irqsave(&go->spinlock, flags);
 	list_del(&vb->list);
 	if (list_empty(&go->vidq_active))
 		vb = NULL;
 	else
 		vb = list_first_entry(&go->vidq_active,
 				struct go7007_buffer, list);
 	go->active_buf = vb;
-	spin_unlock(&go->spinlock);
+	spin_unlock_irqrestore(&go->spinlock, flags);
 	vb2_buffer_done(&vb_tmp->vb.vb2_buf, VB2_BUF_STATE_DONE);
 	return vb;
 }

drivers/media/usb/go7007/snd-go7007.c

@@ -75,13 +75,14 @@ static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
 	struct go7007_snd *gosnd = go->snd_context;
 	struct snd_pcm_runtime *runtime = gosnd->substream->runtime;
 	int frames = bytes_to_frames(runtime, length);
+	unsigned long flags;
 
-	spin_lock(&gosnd->lock);
+	spin_lock_irqsave(&gosnd->lock, flags);
 	gosnd->hw_ptr += frames;
 	if (gosnd->hw_ptr >= runtime->buffer_size)
 		gosnd->hw_ptr -= runtime->buffer_size;
 	gosnd->avail += frames;
-	spin_unlock(&gosnd->lock);
+	spin_unlock_irqrestore(&gosnd->lock, flags);
 	if (gosnd->w_idx + length > runtime->dma_bytes) {
 		int cpy = runtime->dma_bytes - gosnd->w_idx;
 
@@ -92,13 +93,13 @@ static void parse_audio_stream_data(struct go7007 *go, u8 *buf, int length)
 	}
 	memcpy(runtime->dma_area + gosnd->w_idx, buf, length);
 	gosnd->w_idx += length;
-	spin_lock(&gosnd->lock);
+	spin_lock_irqsave(&gosnd->lock, flags);
 	if (gosnd->avail < runtime->period_size) {
-		spin_unlock(&gosnd->lock);
+		spin_unlock_irqrestore(&gosnd->lock, flags);
 		return;
 	}
 	gosnd->avail -= runtime->period_size;
-	spin_unlock(&gosnd->lock);
+	spin_unlock_irqrestore(&gosnd->lock, flags);
 	if (gosnd->capturing)
 		snd_pcm_period_elapsed(gosnd->substream);
 }