linux-kernel - [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1

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Message-ID: <20200705124027.30011-1-qiang.zhang@windriver.com>
Date:   Sun, 5 Jul 2020 20:40:27 +0800
From:   <qiang.zhang@...driver.com>
To:     <balbi@...nel.org>
CC:     <colin.king@...onical.com>, <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <stable@...r.kernel.org>
Subject: [PATCH v3] usb: gadget: function: fix missing spinlock in f_uac1_legacy

From: Zhang Qiang <qiang.zhang@...driver.com>

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.

Cc: stable <stable@...r.kernel.org>
Signed-off-by: Zhang Qiang <qiang.zhang@...driver.com>
---
 v1->v2->v3:
 Add changelog text and Cc tags.

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

diff --git a/drivers/usb/gadget/function/f_uac1_legacy.c b/drivers/usb/gadget/function/f_uac1_legacy.c
index 349deae7cabd..e2d7f69128a0 100644
--- a/drivers/usb/gadget/function/f_uac1_legacy.c
+++ b/drivers/usb/gadget/function/f_uac1_legacy.c
@@ -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))
-- 
2.24.1