From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 10 Jul 2018 16:18:31 +0000 (-0400)
Subject: media: go7007: use irqsave() in USB's complete callback
X-Git-Tag: v5.15~8227^2~62
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a4733b5248af10d5088ba06495e3faad9f7822b3;p=platform%2Fkernel%2Flinux-starfive.git

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>
---

diff --git a/drivers/media/usb/go7007/go7007-driver.c b/drivers/media/usb/go7007/go7007-driver.c
index 05b1126..62aeebc 100644
--- a/drivers/media/usb/go7007/go7007-driver.c
+++ b/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;
 	}
@@ -468,7 +469,7 @@ 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;
@@ -476,7 +477,7 @@ static struct go7007_buffer *frame_boundary(struct go7007 *go, struct go7007_buf
 		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;
 }
diff --git a/drivers/media/usb/go7007/snd-go7007.c b/drivers/media/usb/go7007/snd-go7007.c
index f84a213..137fc25 100644
--- a/drivers/media/usb/go7007/snd-go7007.c
+++ b/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);
 }