Return-path: Received: from smtp-vbr15.xs4all.nl ([194.109.24.35]:4385 "EHLO smtp-vbr15.xs4all.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751390AbaHDKaN (ORCPT ); Mon, 4 Aug 2014 06:30:13 -0400 Message-ID: <53DF60A7.4080208@xs4all.nl> Date: Mon, 04 Aug 2014 12:29:59 +0200 From: Hans Verkuil MIME-Version: 1.0 To: Linux Media Mailing List , Hans de Goede Subject: [PATCH] pwc: fix WARN_ON Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: If start_streaming fails, then the buffers must be given back to vb2 with state QUEUED, not ERROR. Otherwise a WARN_ON will be generated. In the disconnect it is pointless to call pwc_cleanup_queued_bufs() as stop_streaming() will be called anyway. Signed-off-by: Hans Verkuil Tested-by: Hans Verkuil diff --git a/drivers/media/usb/pwc/pwc-if.c b/drivers/media/usb/pwc/pwc-if.c index 15b754d..702267e 100644 --- a/drivers/media/usb/pwc/pwc-if.c +++ b/drivers/media/usb/pwc/pwc-if.c @@ -508,7 +508,8 @@ static void pwc_isoc_cleanup(struct pwc_device *pdev) } /* Must be called with vb_queue_lock hold */ -static void pwc_cleanup_queued_bufs(struct pwc_device *pdev) +static void pwc_cleanup_queued_bufs(struct pwc_device *pdev, + enum vb2_buffer_state state) { unsigned long flags = 0; @@ -519,7 +520,7 @@ static void pwc_cleanup_queued_bufs(struct pwc_device *pdev) buf = list_entry(pdev->queued_bufs.next, struct pwc_frame_buf, list); list_del(&buf->list); - vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); + vb2_buffer_done(&buf->vb, state); } spin_unlock_irqrestore(&pdev->queued_bufs_lock, flags); } @@ -674,7 +675,7 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count) pwc_set_leds(pdev, 0, 0); pwc_camera_power(pdev, 0); /* And cleanup any queued bufs!! */ - pwc_cleanup_queued_bufs(pdev); + pwc_cleanup_queued_bufs(pdev, VB2_BUF_STATE_QUEUED); } mutex_unlock(&pdev->v4l2_lock); @@ -692,7 +693,9 @@ static void stop_streaming(struct vb2_queue *vq) pwc_isoc_cleanup(pdev); } - pwc_cleanup_queued_bufs(pdev); + pwc_cleanup_queued_bufs(pdev, VB2_BUF_STATE_ERROR); + if (pdev->fill_buf) + vb2_buffer_done(&pdev->fill_buf->vb, VB2_BUF_STATE_ERROR); mutex_unlock(&pdev->v4l2_lock); } @@ -1125,7 +1128,6 @@ static void usb_pwc_disconnect(struct usb_interface *intf) if (pdev->vb_queue.streaming) pwc_isoc_cleanup(pdev); pdev->udev = NULL; - pwc_cleanup_queued_bufs(pdev); v4l2_device_disconnect(&pdev->v4l2_dev); video_unregister_device(&pdev->vdev);