From patchwork Tue Feb 13 23:28:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Grzeschik X-Patchwork-Id: 13555827 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C370163099 for ; Tue, 13 Feb 2024 23:28:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707866905; cv=none; b=ZpOY/uVWqIuSSKqFC2/ChmeViZ45n7omfEnozpx+RkI6OWb3zxPWiBaLk1nDUBqKRkg4K50cQy4n2pg6rPy8JyJZ86Cn7Loyxi+frExVeL39rhMBx/FqBjmPhfNCif5iYn0OlS0H96/LQNTL55+7R4Cm2rSVwdYp2h9yWLYEPrY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707866905; c=relaxed/simple; bh=CVvV8hDYr9bL6m/v186v76mN5LV1BfGeIcNkfm5yuxU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=bBb16mw4KHbyJwRaSFR6JOb6WuOGU3aKAgcGCF6OAar5naAs2RhuJAp+L71oGxoI08bBs/GBJzsqhauJ2aGK1+vB5izHS4PnftvJ5l/f+jdcnA4PlSJZmjuiSYDUSU1hTBmpg6/2hjeIATPJmrYiyjtJ8IG5zeif2AF4vtmcNfM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ra2CI-0000eT-Ig; Wed, 14 Feb 2024 00:28:18 +0100 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ra2CH-000Zco-UN; Wed, 14 Feb 2024 00:28:17 +0100 Received: from localhost ([::1] helo=dude04.red.stw.pengutronix.de) by dude04.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1ra2CH-002uYW-2s; Wed, 14 Feb 2024 00:28:17 +0100 From: Michael Grzeschik Date: Wed, 14 Feb 2024 00:28:00 +0100 Subject: [PATCH 1/3] usb: gadget: uvc: drop unnecessary check for always set req Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240214-uvc-gadget-cleanup-v1-1-de6d78780459@pengutronix.de> References: <20240214-uvc-gadget-cleanup-v1-0-de6d78780459@pengutronix.de> In-Reply-To: <20240214-uvc-gadget-cleanup-v1-0-de6d78780459@pengutronix.de> To: Laurent Pinchart , Daniel Scally , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Grzeschik X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1032; i=m.grzeschik@pengutronix.de; h=from:subject:message-id; bh=CVvV8hDYr9bL6m/v186v76mN5LV1BfGeIcNkfm5yuxU=; b=owEBbQKS/ZANAwAKAb9pWET5cfSrAcsmYgBly/sQQgP/ZZy8ylorPv7GT/3A9CuCeeR014oGi 9Gb6LEjUnKJAjMEAAEKAB0WIQQV2+2Fpbqd6fvv0Gi/aVhE+XH0qwUCZcv7EAAKCRC/aVhE+XH0 q4VlD/9MdVUKJntclRLZA9+6LfgBeSjMnA8IU3fGMyrHpVnji8ec9PYNN6B32ZBAwLVrXO2AJMe /uwnF1rwcMZh3SNwuYd8/F4KNHoGczMBLKde7lMbMqe/dw/ZMFmfu+X8vSFtsEiG7tglYclDVF9 b7dPDaWNtDfC8NFeDDSpEBXKt6IXAmvrmnU7O2gjA/C7jEwRiVNlwNHemS5aGag001x+ZMCePUJ ERP9/oKtX/YbayjsgX8ELtbKtTXP7JafYBCluP2wVCi61KH3hsAr2htd64TEj6Rt9g6F0oWYqqj dAgf+AxbexdinTMdIIeUX/pzFKsIQ6vMUctyzGEzRvjrK7YoIIE4SC4ojlEWYqajkKs68KFUvS0 zVld8t8K7bXeOQjBd5b4p5glYwR5pelkZbqansD/CF105Bg5slCKJeAXb1XEQaN11HtATeYsjkj wsSHPL0KuzvE2+BGCSpkRWT+HgiYpDk+k/iAm3i5p8EGPWcFmAlVWzitrbGfxDBQoRiSVbJj12g 8WkmKm194XIg11UAXmxfLaOHF7N285QK816uedbPsDfKpebN8nbGjZxdNQOpXbVvH+CVNgBZtJ8 o5uqotVDYFQLZxDLd30L6W5x68yJsfNr+BhHIYBga1tPOXKeBITfsn7ku/Win2YMAuqmrK8qYJ4 aeAfTYjv/EL7ImQ== X-Developer-Key: i=m.grzeschik@pengutronix.de; a=openpgp; fpr=957BC452CE953D7EA60CF4FC0BE9E3157A1E2C64 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: m.grzeschik@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-usb@vger.kernel.org The pump function is running in an while(1) loop. The only case this loop will be escaped is the two breaks. In both cases the req is valid. Therefor the check for an not set req can be dropped and setting the req to NULL does also has never any effect. Signed-off-by: Michael Grzeschik --- drivers/usb/gadget/function/uvc_video.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index dd3241fc6939d..b17c61c932652 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -623,14 +623,7 @@ static void uvcg_video_pump(struct work_struct *work) uvcg_queue_cancel(queue, 0); break; } - - /* The request is owned by the endpoint / ready list. */ - req = NULL; } - - if (!req) - return; - spin_lock_irqsave(&video->req_lock, flags); if (video->is_enabled) list_add_tail(&req->list, &video->req_free); From patchwork Tue Feb 13 23:28:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Grzeschik X-Patchwork-Id: 13555830 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C36CD63087 for ; 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a=openpgp; fpr=957BC452CE953D7EA60CF4FC0BE9E3157A1E2C64 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: m.grzeschik@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-usb@vger.kernel.org By toggling the condition check for a valid buffer, the else path can be completely avoided. Signed-off-by: Michael Grzeschik --- drivers/usb/gadget/function/uvc_video.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index b17c61c932652..b4f3b3c784218 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -594,10 +594,7 @@ static void uvcg_video_pump(struct work_struct *work) */ spin_lock_irqsave(&queue->irqlock, flags); buf = uvcg_queue_head(queue); - - if (buf != NULL) { - video->encode(req, video, buf); - } else { + if (!buf) { /* * Either the queue has been disconnected or no video buffer * available for bulk transfer. Either way, stop processing @@ -607,6 +604,8 @@ static void uvcg_video_pump(struct work_struct *work) break; } + video->encode(req, video, buf); + spin_unlock_irqrestore(&queue->irqlock, flags); spin_lock_irqsave(&video->req_lock, flags); From patchwork Tue Feb 13 23:28:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Grzeschik X-Patchwork-Id: 13555828 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C368763064 for ; Tue, 13 Feb 2024 23:28:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707866905; cv=none; b=IIOllSbt7gwsDJT3rDiz50HxNV2R7tkMMc6MCfG8v/4FxpWGib4Hw4rLKiHMgDUpcUssClq7HHheKkKoS3bvm6UBPYbL+H6x2QXxGiXJpaNUZensQbYRNFqokPIEpd2v6Qp8tG+dLDHII1drsbCnAMa8lelSRpDxgcL7Ylzm/pY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707866905; c=relaxed/simple; bh=IQ3Y/e/zPuJO66WvMrusL0LrQcoWvCq272yYuoXcg8I=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=SnUq4at8De0kbww9/Ghi9c30r3D48iVo5DfeROrDuYdioSVEgDm2+Q0Ic7B59pqBn5mjFcZGZg+8N94nlbpTHED0NbGZ9j6Bi1Jo5leM6MxCGyZ63+jDgUADajV92Ve6SpVNyYpKaT1+je8eGUD2Ekt8LgTcGD4zn0TJu3qxkR8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ra2CI-0000eU-Ih; Wed, 14 Feb 2024 00:28:18 +0100 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ra2CH-000Zcq-V8; Wed, 14 Feb 2024 00:28:17 +0100 Received: from localhost ([::1] helo=dude04.red.stw.pengutronix.de) by dude04.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1ra2CH-002uYW-2u; Wed, 14 Feb 2024 00:28:17 +0100 From: Michael Grzeschik Date: Wed, 14 Feb 2024 00:28:02 +0100 Subject: [PATCH 3/3] usb: gadget: uvc: rework complete handler Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240214-uvc-gadget-cleanup-v1-3-de6d78780459@pengutronix.de> References: <20240214-uvc-gadget-cleanup-v1-0-de6d78780459@pengutronix.de> In-Reply-To: <20240214-uvc-gadget-cleanup-v1-0-de6d78780459@pengutronix.de> To: Laurent Pinchart , Daniel Scally , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Grzeschik X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5140; i=m.grzeschik@pengutronix.de; h=from:subject:message-id; bh=IQ3Y/e/zPuJO66WvMrusL0LrQcoWvCq272yYuoXcg8I=; b=owEBbQKS/ZANAwAKAb9pWET5cfSrAcsmYgBly/sRqPjQgnXhsPN6K1krJXPbN4oO0gMIjSHDh ODyESfaFlCJAjMEAAEKAB0WIQQV2+2Fpbqd6fvv0Gi/aVhE+XH0qwUCZcv7EQAKCRC/aVhE+XH0 q/CaEACMk8xx1roCJwuAZ81Qtu6o3wB2rl5GyAJ4TGAKUYLFtMwIMvqir785IWJBD5ddVQqosrW 9AmHSNjTDXGpvYDLg5QjBwffQ/49LmMYf+Mrlsk/In1oRHlnFCIdN9geB4tFvClyzHf0H315nQa SjCyO62cqg/XRccWR+iJTyiD76bvAxHhWQDYr/UAWy4uei2gM48q2qYK4V3fVtMsfGqpihMBkjM VL+aOLY7UEPz3AG2l2CtdKF3/BrVROox+N3BMnuREWleGZua1UXL0YAuHoxwW66GVZbBYWSlbJr JsjkX4cnVOFb5bIdQZP1ljgCss2dFsYoI/QAv+gbWDLCRIfKKRNGE+uYIJ7D7eDMt/nmCr1nS6h DjjkpfqWil5Hxr6N9L21BBWmPSV6lTG7OAE7tF4+zyvAL802Bj1tbJQFr0lJ48D5dlklKS93+X2 HGA44nijWDtmAiL43lHs4CDVMMA3juRa4rQazbVo9KsWP3m2PORNs1aktfGlMjZbFbGlhqS77NZ imRt0DdYrCsK+dISSMAR+Di2DXMiVsrlsxmAq7UWZw74yo49LkFclNVjGTMaU5zGe6sDAL/QkfA kEAgkORQJe3uR9ZdEgblKvQQprgjcFvIhTCOwlP8z8VpbhZ4MAanquiH1+ZCGyXuElIo2xzYhE9 0y7ceOz4sHl6/gA== X-Developer-Key: i=m.grzeschik@pengutronix.de; a=openpgp; fpr=957BC452CE953D7EA60CF4FC0BE9E3157A1E2C64 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: m.grzeschik@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-usb@vger.kernel.org We refactor the complete handler since the return path with the locking are really difficult to follow. Just simplify the function by switching the logic return it on an disabled endpoint early. This way the second level of indentation can be removed. Signed-off-by: Michael Grzeschik --- drivers/usb/gadget/function/uvc_video.c | 95 +++++++++++++++++---------------- 1 file changed, 48 insertions(+), 47 deletions(-) diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index b4f3b3c784218..ff7c1fa5c48f3 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -370,6 +370,7 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req) struct uvc_video *video = ureq->video; struct uvc_video_queue *queue = &video->queue; struct uvc_buffer *last_buf; + struct usb_request *to_queue = req; unsigned long flags; bool is_bulk = video->max_payload_size; int ret = 0; @@ -425,59 +426,59 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req) * we're still streaming before queueing the usb_request * back to req_free */ - if (video->is_enabled) { + if (!video->is_enabled) { + uvc_video_free_request(ureq, ep); + spin_unlock_irqrestore(&video->req_lock, flags); + uvcg_queue_cancel(queue, 0); + + return; + } + + /* + * Here we check whether any request is available in the ready + * list. If it is, queue it to the ep and add the current + * usb_request to the req_free list - for video_pump to fill in. + * Otherwise, just use the current usb_request to queue a 0 + * length request to the ep. Since we always add to the req_free + * list if we dequeue from the ready list, there will never + * be a situation where the req_free list is completely out of + * requests and cannot recover. + */ + to_queue->length = 0; + if (!list_empty(&video->req_ready)) { + to_queue = list_first_entry(&video->req_ready, + struct usb_request, list); + list_del(&to_queue->list); + list_add_tail(&req->list, &video->req_free); /* - * Here we check whether any request is available in the ready - * list. If it is, queue it to the ep and add the current - * usb_request to the req_free list - for video_pump to fill in. - * Otherwise, just use the current usb_request to queue a 0 - * length request to the ep. Since we always add to the req_free - * list if we dequeue from the ready list, there will never - * be a situation where the req_free list is completely out of - * requests and cannot recover. + * Queue work to the wq as well since it is possible that a + * buffer may not have been completely encoded with the set of + * in-flight usb requests for whih the complete callbacks are + * firing. + * In that case, if we do not queue work to the worker thread, + * the buffer will never be marked as complete - and therefore + * not be returned to userpsace. As a result, + * dequeue -> queue -> dequeue flow of uvc buffers will not + * happen. */ - struct usb_request *to_queue = req; - - to_queue->length = 0; - if (!list_empty(&video->req_ready)) { - to_queue = list_first_entry(&video->req_ready, - struct usb_request, list); - list_del(&to_queue->list); - list_add_tail(&req->list, &video->req_free); - /* - * Queue work to the wq as well since it is possible that a - * buffer may not have been completely encoded with the set of - * in-flight usb requests for whih the complete callbacks are - * firing. - * In that case, if we do not queue work to the worker thread, - * the buffer will never be marked as complete - and therefore - * not be returned to userpsace. As a result, - * dequeue -> queue -> dequeue flow of uvc buffers will not - * happen. - */ - queue_work(video->async_wq, &video->pump); - } + queue_work(video->async_wq, &video->pump); + } + /* + * Queue to the endpoint. The actual queueing to ep will + * only happen on one thread - the async_wq for bulk endpoints + * and this thread for isoc endpoints. + */ + ret = uvcg_video_usb_req_queue(video, to_queue, !is_bulk); + if (ret < 0) { /* - * Queue to the endpoint. The actual queueing to ep will - * only happen on one thread - the async_wq for bulk endpoints - * and this thread for isoc endpoints. + * Endpoint error, but the stream is still enabled. + * Put request back in req_free for it to be cleaned + * up later. */ - ret = uvcg_video_usb_req_queue(video, to_queue, !is_bulk); - if (ret < 0) { - /* - * Endpoint error, but the stream is still enabled. - * Put request back in req_free for it to be cleaned - * up later. - */ - list_add_tail(&to_queue->list, &video->req_free); - } - } else { - uvc_video_free_request(ureq, ep); - ret = 0; + list_add_tail(&to_queue->list, &video->req_free); } + spin_unlock_irqrestore(&video->req_lock, flags); - if (ret < 0) - uvcg_queue_cancel(queue, 0); } static int