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GET /api/patches/2231659/?format=api
{ "id": 2231659, "url": "http://patchwork.ozlabs.org/api/patches/2231659/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/e4ed435c44fc191f2eb23c7907ba6f72f193e6aa.1777606826.git.ritesh.list@gmail.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "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/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<e4ed435c44fc191f2eb23c7907ba6f72f193e6aa.1777606826.git.ritesh.list@gmail.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/e4ed435c44fc191f2eb23c7907ba6f72f193e6aa.1777606826.git.ritesh.list@gmail.com/", "date": "2026-05-01T04:11:40", "name": "[v3,1/9] pseries/papr-hvpipe: Fix race with interrupt handler", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "a49a2b25deb64bdcab5e8e2e06691b8762d503e2", "submitter": { "id": 79126, "url": "http://patchwork.ozlabs.org/api/people/79126/?format=api", "name": "Ritesh Harjani (IBM)", "email": "ritesh.list@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/e4ed435c44fc191f2eb23c7907ba6f72f193e6aa.1777606826.git.ritesh.list@gmail.com/mbox/", "series": [ { "id": 502420, "url": "http://patchwork.ozlabs.org/api/series/502420/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=502420", "date": "2026-05-01T04:11:39", "name": "pseries/papr-hvpipe: Fix deadlock, races and misc cleanups", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/502420/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2231659/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2231659/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20352-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=QnZ0cfXQ;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; helo=lists.ozlabs.org;\n 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d2e1a72fcca58-834fdc5c2admr6357028b3a.43.1777608739583;\n Thu, 30 Apr 2026 21:12:19 -0700 (PDT)", "From": "\"Ritesh Harjani (IBM)\" <ritesh.list@gmail.com>", "To": "linuxppc-dev@lists.ozlabs.org,\n\tHaren Myneni <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>,\n\tstable@vger.kernel.org", "Subject": "[PATCH v3 1/9] pseries/papr-hvpipe: Fix race with interrupt handler", "Date": "Fri, 1 May 2026 09:41:40 +0530", "Message-ID": "\n <e4ed435c44fc191f2eb23c7907ba6f72f193e6aa.1777606826.git.ritesh.list@gmail.com>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<cover.1777606826.git.ritesh.list@gmail.com>", "References": "<cover.1777606826.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": "While executing ->ioctl handler or ->release handler, if an interrupt\nfires on the same cpu, then we can enter into a deadlock.\n\nThis patch fixes both these handlers to take spin_lock_irq{save|restore}\nversions of the lock to prevent this deadlock.\n\nCc: stable@vger.kernel.org\nFixes: 814ef095f12c9 (\"powerpc/pseries: Add papr-hvpipe char driver for HVPIPE interfaces\")\nSigned-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>\n---\n arch/powerpc/platforms/pseries/papr-hvpipe.c | 20 +++++++++++---------\n 1 file changed, 11 insertions(+), 9 deletions(-)", "diff": "diff --git a/arch/powerpc/platforms/pseries/papr-hvpipe.c b/arch/powerpc/platforms/pseries/papr-hvpipe.c\nindex 14ae480d060a..c41d45e1986d 100644\n--- a/arch/powerpc/platforms/pseries/papr-hvpipe.c\n+++ b/arch/powerpc/platforms/pseries/papr-hvpipe.c\n@@ -444,13 +444,14 @@ static int papr_hvpipe_handle_release(struct inode *inode,\n \t\t\t\tstruct file *file)\n {\n \tstruct hvpipe_source_info *src_info;\n+\tunsigned long flags;\n \n \t/*\n \t * Hold the lock, remove source from src_list, reset the\n \t * hvpipe status and release the lock to prevent any race\n \t * with message event IRQ.\n \t */\n-\tspin_lock(&hvpipe_src_list_lock);\n+\tspin_lock_irqsave(&hvpipe_src_list_lock, flags);\n \tsrc_info = file->private_data;\n \tlist_del(&src_info->list);\n \tfile->private_data = NULL;\n@@ -461,10 +462,10 @@ static int papr_hvpipe_handle_release(struct inode *inode,\n \t */\n \tif (src_info->hvpipe_status & HVPIPE_MSG_AVAILABLE) {\n \t\tsrc_info->hvpipe_status = 0;\n-\t\tspin_unlock(&hvpipe_src_list_lock);\n+\t\tspin_unlock_irqrestore(&hvpipe_src_list_lock, flags);\n \t\thvpipe_rtas_recv_msg(NULL, 0);\n \t} else\n-\t\tspin_unlock(&hvpipe_src_list_lock);\n+\t\tspin_unlock_irqrestore(&hvpipe_src_list_lock, flags);\n \n \tkfree(src_info);\n \treturn 0;\n@@ -480,20 +481,21 @@ static const struct file_operations papr_hvpipe_handle_ops = {\n static int papr_hvpipe_dev_create_handle(u32 srcID)\n {\n \tstruct hvpipe_source_info *src_info __free(kfree) = NULL;\n+\tunsigned long flags;\n \n-\tspin_lock(&hvpipe_src_list_lock);\n+\tspin_lock_irqsave(&hvpipe_src_list_lock, flags);\n \t/*\n \t * Do not allow more than one process communicates with\n \t * each source.\n \t */\n \tsrc_info = hvpipe_find_source(srcID);\n \tif (src_info) {\n-\t\tspin_unlock(&hvpipe_src_list_lock);\n+\t\tspin_unlock_irqrestore(&hvpipe_src_list_lock, flags);\n \t\tpr_err(\"pid(%d) is already using the source(%d)\\n\",\n \t\t\t\tsrc_info->tsk->pid, srcID);\n \t\treturn -EALREADY;\n \t}\n-\tspin_unlock(&hvpipe_src_list_lock);\n+\tspin_unlock_irqrestore(&hvpipe_src_list_lock, flags);\n \n \tsrc_info = kzalloc_obj(*src_info, GFP_KERNEL_ACCOUNT);\n \tif (!src_info)\n@@ -510,18 +512,18 @@ static int papr_hvpipe_dev_create_handle(u32 srcID)\n \t\treturn fdf.err;\n \n \tretain_and_null_ptr(src_info);\n-\tspin_lock(&hvpipe_src_list_lock);\n+\tspin_lock_irqsave(&hvpipe_src_list_lock, flags);\n \t/*\n \t * If two processes are executing ioctl() for the same\n \t * source ID concurrently, prevent the second process to\n \t * acquire FD.\n \t */\n \tif (hvpipe_find_source(srcID)) {\n-\t\tspin_unlock(&hvpipe_src_list_lock);\n+\t\tspin_unlock_irqrestore(&hvpipe_src_list_lock, flags);\n \t\treturn -EALREADY;\n \t}\n \tlist_add(&src_info->list, &hvpipe_src_list);\n-\tspin_unlock(&hvpipe_src_list_lock);\n+\tspin_unlock_irqrestore(&hvpipe_src_list_lock, flags);\n \treturn fd_publish(fdf);\n }\n \n", "prefixes": [ "v3", "1/9" ] }