patch "usb: gadget: function: fix missing spinlock in f_uac1_legacy" added to usb-linus

This is a note to let you know that I've just added the patch titled

usb: gadget: function: fix missing spinlock in f_uac1_legacy

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 8778eb0927ddcd3f431805c37b78fa56481aeed9 Mon Sep 17 00:00:00 2001
From: Zhang Qiang <[email protected]>
Date: Mon, 6 Jul 2020 13:14:55 +0800
Subject: usb: gadget: function: fix missing spinlock in f_uac1_legacy

Add a missing spinlock protection for play_queue, because the play_queue may be destroyed when the "playback_work" work func and "f_audio_out_ep_complete" callback func operate this paly_queue at the same time.

---
 drivers/usb/gadget/function/f_uac1_legacy.c | 2 ++
 1 file changed, 2 insertions(+)

index 349deae7cabd..e2d7f69128a0 100644
@@ -336,7 +336,9 @@ static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
 
 	/* Copy buffer is full, add it to the play_queue */
 	if (audio_buf_size - copy_buf->actual < req->actual) {
+		spin_lock_irq(&audio->lock);
 		list_add_tail(&copy_buf->list, &audio->play_queue);
+		spin_unlock_irq(&audio->lock);
 		schedule_work(&audio->playback_work);
 		copy_buf = f_audio_buffer_alloc(audio_buf_size);
 		if (IS_ERR(copy_buf))

2.27.0