Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 43/58] usb: gadget: function: fix missing spinlock in f_uac1_legacy | Date | Mon, 20 Jul 2020 17:36:59 +0200 |
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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.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/usb/gadget/function/f_uac1.c +++ b/drivers/usb/gadget/function/f_uac1.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))
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