[{"id":2024,"web_url":"https://patchwork.libcamera.org/comment/2024/","msgid":"","date":"2019-06-25T19:51:48","subject":"Re: [libcamera-devel] [PATCH] cam: capture: Stop stream when\n\tqueueRequest fails","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Hi Helen,\n\nThank you for the patch, and welcome to libcamera !\n\nOn 25/06/2019 17:23, Helen Koike wrote:\n> queueRequest is called after starting the stream.\n\nVery minor, We normally put '()' to denote functions so it would be good\nto put queueRequest()\n\nI can add those while applying.\n\n\n> If it fails, the stream should be stopped, otherwise it can get a\n> \"Device or resource busy\" error, due to VIDIOC_REQBUFS ioctls being\n> called after VIDIOC_STREAMON without VIDIOC_STREAMOFF in-between.\n\nSounds like a good find. I hope this means that libcamera is starting to\nbe useful already.\n\nOut of curiosity, what platform are you running this on? RK3399 perhaps?\n\n\n> Signed-off-by: Helen Koike \n> ---\n> src/cam/capture.cpp | 1 +\n> 1 file changed, 1 insertion(+)\n> \n> diff --git a/src/cam/capture.cpp b/src/cam/capture.cpp\n> index e455612..6b842d7 100644\n> --- a/src/cam/capture.cpp\n> +++ b/src/cam/capture.cpp\n> @@ -117,6 +117,7 @@ int Capture::capture(EventLoop *loop)\n> \t\tret = camera_->queueRequest(request);\n> \t\tif (ret < 0) {\n> \t\t\tstd::cerr << \"Can't queue request\" << std::endl;\n> +\t\t\tcamera_->stop();\n\nThis looks good to me,\n\nIt seems clear that this is an unbalanced start()/stop() code path in\nthe cam utility. I started to wonder while reviewing this if we should\nhave a call somewhere that stops the camera on an error, but I think\nthat goes beyond the scope of this patch and handling errors with magic\nwill be some extra policy :-)\n\nReviewed-by: Kieran Bingham \n\n\n> \t\t\treturn ret;\n> \t\t}\n> \t}\n>","headers":{"Return-Path":"","Received":["from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 24A7460103\n\tfor ;\n\tTue, 25 Jun 2019 21:51:52 +0200 (CEST)","from [192.168.0.20]\n\t(cpc89242-aztw30-2-0-cust488.18-1.cable.virginm.net [86.31.129.233])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 77427510;\n\tTue, 25 Jun 2019 21:51:51 +0200 (CEST)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1561492311;\n\tbh=AK4Tq3izjTlUpzuNKs6txU/XWil2OL+8qJCGIwu99Y8=;\n\th=Reply-To:Subject:To:Cc:References:From:Date:In-Reply-To:From;\n\tb=t6u/mfLuqfccRgt+85UTPQs2p6Y/HuH38hMHZ2Y0h3SEbPcyHOnsAxv+xb9ocORWS\n\tLAYNcFi6Ls1WdaJYwLvd3R1QViiCZ5A4v0ham0U6SLZRDU8xZMBbOfgnyw1GaTvBPn\n\tDBGygItwf0IKO9cl+t0KvQuos2Ptd//hwSQs93RA=","Reply-To":"kieran.bingham@ideasonboard.com","To":"Helen Koike ,\n\tlibcamera-devel@lists.libcamera.org","Cc":"kernel@collabora.com","References":"<20190625162353.30434-1-helen.koike@collabora.com>","From":"Kieran Bingham ","Openpgp":"preference=signencrypt","Autocrypt":"addr=kieran.bingham@ideasonboard.com; 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Linux x86_64; rv:60.0) Gecko/20100101\n\tThunderbird/60.7.0","MIME-Version":"1.0","In-Reply-To":"<20190625162353.30434-1-helen.koike@collabora.com>","Content-Type":"text/plain; charset=utf-8","Content-Language":"en-GB","Content-Transfer-Encoding":"8bit","Subject":"Re: [libcamera-devel] [PATCH] cam: capture: Stop stream when\n\tqueueRequest fails","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.23","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","X-List-Received-Date":"Tue, 25 Jun 2019 19:51:52 -0000"}},{"id":2025,"web_url":"https://patchwork.libcamera.org/comment/2025/","msgid":"<15305512-29e0-5f82-e713-43c62bc8e0f0@ideasonboard.com>","date":"2019-06-25T19:56:43","subject":"Re: [libcamera-devel] [PATCH] cam: capture: Stop stream when\n\tqueueRequest fails","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Hi Helen,\n\nOn 25/06/2019 20:51, Kieran Bingham wrote:\n> Hi Helen,\n> \n> Thank you for the patch, and welcome to libcamera !\n> \n> On 25/06/2019 17:23, Helen Koike wrote:\n>> queueRequest is called after starting the stream.\n> \n> Very minor, We normally put '()' to denote functions so it would be good\n> to put queueRequest()\n> \n> I can add those while applying.\n\nThis works and passes the tests (and manual testing of cam) so I've\npushed it to master.\n\nThank you.\n\nRegards,\n\nKieran\n\n\n>> If it fails, the stream should be stopped, otherwise it can get a\n>> \"Device or resource busy\" error, due to VIDIOC_REQBUFS ioctls being\n>> called after VIDIOC_STREAMON without VIDIOC_STREAMOFF in-between.\n> \n> Sounds like a good find. I hope this means that libcamera is starting to\n> be useful already.\n> \n> Out of curiosity, what platform are you running this on? RK3399 perhaps?\n> \n> \n>> Signed-off-by: Helen Koike \n>> ---\n>> src/cam/capture.cpp | 1 +\n>> 1 file changed, 1 insertion(+)\n>>\n>> diff --git a/src/cam/capture.cpp b/src/cam/capture.cpp\n>> index e455612..6b842d7 100644\n>> --- a/src/cam/capture.cpp\n>> +++ b/src/cam/capture.cpp\n>> @@ -117,6 +117,7 @@ int Capture::capture(EventLoop *loop)\n>> \t\tret = camera_->queueRequest(request);\n>> \t\tif (ret < 0) {\n>> \t\t\tstd::cerr << \"Can't queue request\" << std::endl;\n>> +\t\t\tcamera_->stop();\n> \n> This looks good to me,\n> \n> It seems clear that this is an unbalanced start()/stop() code path in\n> the cam utility. I started to wonder while reviewing this if we should\n> have a call somewhere that stops the camera on an error, but I think\n> that goes beyond the scope of this patch and handling errors with magic\n> will be some extra policy :-)\n> \n> Reviewed-by: Kieran Bingham \n> \n> \n>> \t\t\treturn ret;\n>> \t\t}\n>> \t}\n>>\n>","headers":{"Return-Path":"","Received":["from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id A3CF060BC7\n\tfor ;\n\tTue, 25 Jun 2019 21:56:46 +0200 (CEST)","from [192.168.0.20]\n\t(cpc89242-aztw30-2-0-cust488.18-1.cable.virginm.net [86.31.129.233])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 1B70C510;\n\tTue, 25 Jun 2019 21:56:45 +0200 (CEST)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1561492606;\n\tbh=i304dFsJCkIyYhCrpLZ3O/pAiBDBlBZq+jtqqodsdlQ=;\n\th=Reply-To:Subject:From:To:Cc:References:Date:In-Reply-To:From;\n\tb=eS79wb+L5MqgsTMiERmONbF2Y5JSkrgRJ1lmNorbuPcw6tv/tSFx6OM32O0QVraF2\n\tOYU37jb6wiQD3hDL/sGeO7sludsxQLQMRchcYLXRO16kMxoTarWvZ2fQabD/tcPeLF\n\t3cJs2z7Rb0fTUGHn7E9UL7OzzCZcXV9SNQumwmHs=","Reply-To":"kieran.bingham@ideasonboard.com","From":"Kieran Bingham ","To":"Helen Koike ,\n\tlibcamera-devel@lists.libcamera.org","Cc":"kernel@collabora.com","References":"<20190625162353.30434-1-helen.koike@collabora.com>\n\t","Openpgp":"preference=signencrypt","Autocrypt":"addr=kieran.bingham@ideasonboard.com; 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Linux x86_64; rv:60.0) Gecko/20100101\n\tThunderbird/60.7.0","MIME-Version":"1.0","In-Reply-To":"","Content-Type":"text/plain; charset=utf-8","Content-Language":"en-GB","Content-Transfer-Encoding":"7bit","Subject":"Re: [libcamera-devel] [PATCH] cam: capture: Stop stream when\n\tqueueRequest fails","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.23","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","X-List-Received-Date":"Tue, 25 Jun 2019 19:56:46 -0000"}},{"id":2043,"web_url":"https://patchwork.libcamera.org/comment/2043/","msgid":"<0f0f2c9c-1f5c-2d0c-6799-f278cc4e5f05@collabora.com>","date":"2019-06-26T15:04:14","subject":"Re: [libcamera-devel] [PATCH] cam: capture: Stop stream when\n\tqueueRequest fails","submitter":{"id":20,"url":"https://patchwork.libcamera.org/api/people/20/","name":"Helen Koike","email":"helen.koike@collabora.com"},"content":"Hi Kieran,\n\nOn 6/25/19 4:51 PM, Kieran Bingham wrote:\n> Hi Helen,\n> \n> Thank you for the patch, and welcome to libcamera !\n> \n> On 25/06/2019 17:23, Helen Koike wrote:\n>> queueRequest is called after starting the stream.\n> \n> Very minor, We normally put '()' to denote functions so it would be good\n> to put queueRequest()\n\nGood to know.\n\n> \n> I can add those while applying.\n\nThanks!\n\n> \n> \n>> If it fails, the stream should be stopped, otherwise it can get a\n>> \"Device or resource busy\" error, due to VIDIOC_REQBUFS ioctls being\n>> called after VIDIOC_STREAMON without VIDIOC_STREAMOFF in-between.\n> \n> Sounds like a good find. I hope this means that libcamera is starting to\n> be useful already.\n\nIt is :)\n\n> \n> Out of curiosity, what platform are you running this on? RK3399 perhaps?\n\nYes, rk3399.\n\nRegards,\nHelen\n\n> \n> \n>> Signed-off-by: Helen Koike \n>> ---\n>> src/cam/capture.cpp | 1 +\n>> 1 file changed, 1 insertion(+)\n>>\n>> diff --git a/src/cam/capture.cpp b/src/cam/capture.cpp\n>> index e455612..6b842d7 100644\n>> --- a/src/cam/capture.cpp\n>> +++ b/src/cam/capture.cpp\n>> @@ -117,6 +117,7 @@ int Capture::capture(EventLoop *loop)\n>> \t\tret = camera_->queueRequest(request);\n>> \t\tif (ret < 0) {\n>> \t\t\tstd::cerr << \"Can't queue request\" << std::endl;\n>> +\t\t\tcamera_->stop();\n> \n> This looks good to me,\n> \n> It seems clear that this is an unbalanced start()/stop() code path in\n> the cam utility. I started to wonder while reviewing this if we should\n> have a call somewhere that stops the camera on an error, but I think\n> that goes beyond the scope of this patch and handling errors with magic\n> will be some extra policy :-)\n> \n> Reviewed-by: Kieran Bingham \n> \n> \n>> \t\t\treturn ret;\n>> \t\t}\n>> \t}\n>>\n>","headers":{"Return-Path":"","Received":["from bhuna.collabora.co.uk (bhuna.collabora.co.uk\n\t[IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id AC5786157F\n\tfor ;\n\tWed, 26 Jun 2019 17:04:24 +0200 (CEST)","from [127.0.0.1] (localhost [127.0.0.1])\n\t(Authenticated sender: koike) with ESMTPSA id 4E65326040B"],"To":"kieran.bingham@ideasonboard.com, libcamera-devel@lists.libcamera.org","Cc":"kernel@collabora.com","References":"<20190625162353.30434-1-helen.koike@collabora.com>\n\t","From":"Helen Koike ","Openpgp":"preference=signencrypt","Autocrypt":"addr=helen.koike@collabora.com; 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26 Jun 2019 12:04:14 -0300","User-Agent":"Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101\n\tThunderbird/60.7.0","MIME-Version":"1.0","In-Reply-To":"","Content-Type":"text/plain; charset=utf-8","Content-Language":"en-US","Content-Transfer-Encoding":"7bit","Subject":"Re: [libcamera-devel] [PATCH] cam: capture: Stop stream when\n\tqueueRequest fails","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.23","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","X-List-Received-Date":"Wed, 26 Jun 2019 15:04:24 -0000"}}]