linux-kernel - [PATCH v6 1/9] usb: gadget: uvc: wake pump everytime we update the free list

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Message-Id: <20240403-uvc_request_length_by_interval-v6-1-08c05522e1f5@pengutronix.de>
Date: Sun, 29 Sep 2024 20:59:21 +0200
From: Michael Grzeschik <m.grzeschik@...gutronix.de>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Daniel Scally <dan.scally@...asonboard.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Avichal Rakesh <arakesh@...gle.com>, 
 Jayant Chowdhary <jchowdhary@...gle.com>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 kernel@...gutronix.de, Michael Grzeschik <m.grzeschik@...gutronix.de>
Subject: [PATCH v6 1/9] usb: gadget: uvc: wake pump everytime we update the
 free list

Since the req_free list will updated if enqueuing one request was not
possible it will be added back to the free list. With every available
free request in the queue it is a valid case for the pump worker to use
it and continue the pending bufferdata into requests for the req_ready
list.

Fixes: 6acba0345b68 ("usb:gadget:uvc Do not use worker thread to pump isoc usb requests")
Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>

---
v5 -> v6: -
v1 -> v5: - new patch
---
 drivers/usb/gadget/function/uvc_video.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
index a9edd60fbbf77..48fd8d3c50b0c 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -480,6 +480,10 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req)
 		 * up later.
 		 */
 		list_add_tail(&to_queue->list, &video->req_free);
+		/*
+		 * There is a new free request - wake up the pump.
+		 */
+		queue_work(video->async_wq, &video->pump);
 	}
 
 	spin_unlock_irqrestore(&video->req_lock, flags);

-- 
2.39.5