From: Zhang Qiang qiang.zhang@windriver.com
commit 8778eb0927ddcd3f431805c37b78fa56481aeed9 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/gadget/function/f_uac1_legacy.c | 2 ++ 1 file changed, 2 insertions(+)
--- 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(struc
/* 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(©_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))