{"id":2220922,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2220922/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/3ff4de80fce72914eff23a169c974786858517e1.1775648406.git.ritesh.list@gmail.com/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/1.1/projects/2/?format=json","name":"Linux PPC development","link_name":"linuxppc-dev","list_id":"linuxppc-dev.lists.ozlabs.org","list_email":"linuxppc-dev@lists.ozlabs.org","web_url":"https://github.com/linuxppc/wiki/wiki","scm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git","webscm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/"},"msgid":"<3ff4de80fce72914eff23a169c974786858517e1.1775648406.git.ritesh.list@gmail.com>","date":"2026-04-08T12:01:40","name":"[RFC,v2,10/10] pseries/papr-hvpipe: Fix error handling in case of init routine fails","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"199340cc6dcc41124ff4f944b8e144d277e33f93","submitter":{"id":79126,"url":"http://patchwork.ozlabs.org/api/1.1/people/79126/?format=json","name":"Ritesh Harjani (IBM)","email":"ritesh.list@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/3ff4de80fce72914eff23a169c974786858517e1.1775648406.git.ritesh.list@gmail.com/mbox/","series":[{"id":499129,"url":"http://patchwork.ozlabs.org/api/1.1/series/499129/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=499129","date":"2026-04-08T12:01:30","name":"pseries/papr-hvpipe: Fix deadlock, races and misc cleanups","version":2,"mbox":"http://patchwork.ozlabs.org/series/499129/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2220922/comments/","check":"fail","checks":"http://patchwork.ozlabs.org/api/patches/2220922/checks/","tags":{},"headers":{"Return-Path":"\n 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<haren@linux.ibm.com>","Cc":"Madhavan Srinivasan <maddy@linux.ibm.com>,\n\tChristophe Leroy <chleroy@kernel.org>,\n\tVenkat Rao Bagalkote <venkat88@linux.ibm.com>,\n\tNicholas Piggin <npiggin@gmail.com>,\n\tlinux-kernel@vger.kernel.org,\n\t\"Ritesh Harjani (IBM)\" <ritesh.list@gmail.com>","Subject":"[RFC v2 10/10] pseries/papr-hvpipe: Fix error handling in case of\n init routine fails","Date":"Wed,  8 Apr 2026 17:31:40 +0530","Message-ID":"\n <3ff4de80fce72914eff23a169c974786858517e1.1775648406.git.ritesh.list@gmail.com>","X-Mailer":"git-send-email 2.50.1","In-Reply-To":"<cover.1775648406.git.ritesh.list@gmail.com>","References":"<cover.1775648406.git.ritesh.list@gmail.com>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"<linuxppc-dev.lists.ozlabs.org>","List-Help":"<mailto:linuxppc-dev+help@lists.ozlabs.org>","List-Owner":"<mailto:linuxppc-dev+owner@lists.ozlabs.org>","List-Post":"<mailto:linuxppc-dev@lists.ozlabs.org>","List-Archive":"<https://lore.kernel.org/linuxppc-dev/>,\n  <https://lists.ozlabs.org/pipermail/linuxppc-dev/>","List-Subscribe":"<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n  <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n  <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>","List-Unsubscribe":"<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>","Precedence":"list","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"},"content":"We have already enabled interrupt sources and enabled hvpipe to received\ninterrupts, if misc_register() fails, we will destroy the workqueue, but\nthe HMC might send us a msg via hvpipe which will call, queue work on\nthe workqueue which might be destroyed.\n\nSo instead, let's reverse the order of enabling set_hvpipe_sys_param(1)\nand in case of an error let's remove the misc dev by calling\nmisc_deregister().\n\nSigned-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>\n---\n arch/powerpc/platforms/pseries/papr-hvpipe.c | 8 +++++---\n 1 file changed, 5 insertions(+), 3 deletions(-)\n\n--\n2.39.5","diff":"diff --git a/arch/powerpc/platforms/pseries/papr-hvpipe.c b/arch/powerpc/platforms/pseries/papr-hvpipe.c\nindex c708869ca732..b6d0b36915c6 100644\n--- a/arch/powerpc/platforms/pseries/papr-hvpipe.c\n+++ b/arch/powerpc/platforms/pseries/papr-hvpipe.c\n@@ -785,18 +785,20 @@ static int __init papr_hvpipe_init(void)\n \tif (ret)\n \t\tgoto out_wq;\n\n-\tret = set_hvpipe_sys_param(1);\n+\tret = misc_register(&papr_hvpipe_dev);\n \tif (ret)\n \t\tgoto out_wq;\n\n-\tret = misc_register(&papr_hvpipe_dev);\n+\tret = set_hvpipe_sys_param(1);\n \tif (ret)\n-\t\tgoto out_wq;\n+\t\tgoto out_misc;\n\n \tpr_info(\"hvpipe feature is enabled\\n\");\n \thvpipe_feature = true;\n \treturn 0;\n\n+out_misc:\n+\tmisc_deregister(&papr_hvpipe_dev);\n out_wq:\n \tdestroy_workqueue(papr_hvpipe_wq);\n out:\n","prefixes":["RFC","v2","10/10"]}