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 qiang.zhang@windriver.com 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.

Fixes: c6994e6f067cf ("USB: gadget: add USB Audio Gadget driver") Cc: stable stable@vger.kernel.org Signed-off-by: Zhang Qiang qiang.zhang@windriver.com Signed-off-by: Felipe Balbi balbi@kernel.org --- 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))