From patchwork Fri Jul 28 23:19:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rob Herring \(Arm\)" X-Patchwork-Id: 707641 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25E36C0015E for ; Fri, 28 Jul 2023 23:20:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232732AbjG1XUA (ORCPT ); Fri, 28 Jul 2023 19:20:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230221AbjG1XT7 (ORCPT ); Fri, 28 Jul 2023 19:19:59 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C099730CF; Fri, 28 Jul 2023 16:19:58 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 555126220F; Fri, 28 Jul 2023 23:19:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EADE3C433C7; Fri, 28 Jul 2023 23:19:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1690586397; bh=Wmvrhsi2R8px/p9KZeL9XwfWiVDPSupv0EHaOaT/ABg=; h=From:To:Cc:Subject:Date:From; b=hO4yly3eUrPiHF3Zo43Tqk+YOC1rOCcVc7Vim7ubK1gIugJ7HRzIizLB7vrKk0Sl0 lBiDRb1s+Bi8v9luFrtfjwXonza3++idplv6ggjxGYC4EW+/qeY3UkcOKvxblAuvM+ a/n2h6aX2lXBF0lnrM9kEyFyBD0fbOn7VafzQscWcXuwiFtAuvtb1J3sNpR57IKhmA hdW8zPoDS59UTTUGjRfrDhNRjNMsYXuPQOkPBUfI3Zq1ZMQj7wxzc3prSrla96q40i rEeGmFesr7YafvAA43eJYA6Li012s1YI1fbOFV6kuKIDZG+W/OudKnjEbSqGSiW423 BSQx7CupYOr+A== Received: (nullmailer pid 1619204 invoked by uid 1000); Fri, 28 Jul 2023 23:19:55 -0000 From: Rob Herring To: Frank Rowand , "Rafael J. Wysocki" , Petr Mladek , Andy Shevchenko , Sakari Ailus Cc: Geert Uytterhoeven , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3] of: dynamic: Refactor action prints to not use "%pOF" inside devtree_lock Date: Fri, 28 Jul 2023 17:19:50 -0600 Message-Id: <20230728231950.1619073-1-robh@kernel.org> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org While originally it was fine to format strings using "%pOF" while holding devtree_lock, this now causes a deadlock. Lockdep reports: of_get_parent from of_fwnode_get_parent+0x18/0x24 ^^^^^^^^^^^^^ of_fwnode_get_parent from fwnode_count_parents+0xc/0x28 fwnode_count_parents from fwnode_full_name_string+0x18/0xac fwnode_full_name_string from device_node_string+0x1a0/0x404 device_node_string from pointer+0x3c0/0x534 pointer from vsnprintf+0x248/0x36c vsnprintf from vprintk_store+0x130/0x3b4 To fix this, move the printing in __of_changeset_entry_apply() outside the lock. As there's already similar printing of the same changeset actions, refactor all of them to use a common action print function. This has the side benefit of getting rid of some ifdefs. Fixes: a92eb7621b9fb2c2 ("lib/vsprintf: Make use of fwnode API to obtain node names and separators") Reported-by: Geert Uytterhoeven Signed-off-by: Rob Herring --- v1 and v2 from Geert simply moved the devtree_lock into each case statement: https://lore.kernel.org/all/c593d8389352c574b5be69d4ca4810da13326a50.1690533838.git.geert+renesas@glider.be/ --- drivers/of/dynamic.c | 79 ++++++++++---------------------------------- 1 file changed, 17 insertions(+), 62 deletions(-) diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c index e311d406b170..6edb084e928a 100644 --- a/drivers/of/dynamic.c +++ b/drivers/of/dynamic.c @@ -63,37 +63,30 @@ int of_reconfig_notifier_unregister(struct notifier_block *nb) } EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister); -#ifdef DEBUG -const char *action_names[] = { +static const char *action_names[] = { [OF_RECONFIG_ATTACH_NODE] = "ATTACH_NODE", [OF_RECONFIG_DETACH_NODE] = "DETACH_NODE", [OF_RECONFIG_ADD_PROPERTY] = "ADD_PROPERTY", [OF_RECONFIG_REMOVE_PROPERTY] = "REMOVE_PROPERTY", [OF_RECONFIG_UPDATE_PROPERTY] = "UPDATE_PROPERTY", }; -#endif + +void of_changeset_action_print(unsigned long action, struct device_node *np, const char *prop_name) +{ + if (prop_name) + pr_cont("%-15s %pOF:%s\n", action_names[action], np, prop_name); + else + pr_cont("%-15s %pOF\n", action_names[action], np); +} int of_reconfig_notify(unsigned long action, struct of_reconfig_data *p) { int rc; -#ifdef DEBUG struct of_reconfig_data *pr = p; - switch (action) { - case OF_RECONFIG_ATTACH_NODE: - case OF_RECONFIG_DETACH_NODE: - pr_debug("notify %-15s %pOF\n", action_names[action], - pr->dn); - break; - case OF_RECONFIG_ADD_PROPERTY: - case OF_RECONFIG_REMOVE_PROPERTY: - case OF_RECONFIG_UPDATE_PROPERTY: - pr_debug("notify %-15s %pOF:%s\n", action_names[action], - pr->dn, pr->prop->name); - break; + if (pr_debug("notify ")) + of_changeset_action_print(action, pr->dn, pr->prop ? pr->prop->name : NULL); - } -#endif rc = blocking_notifier_call_chain(&of_reconfig_chain, action, p); return notifier_to_errno(rc); } @@ -504,30 +497,6 @@ static void __of_changeset_entry_destroy(struct of_changeset_entry *ce) kfree(ce); } -#ifdef DEBUG -static void __of_changeset_entry_dump(struct of_changeset_entry *ce) -{ - switch (ce->action) { - case OF_RECONFIG_ADD_PROPERTY: - case OF_RECONFIG_REMOVE_PROPERTY: - case OF_RECONFIG_UPDATE_PROPERTY: - pr_debug("cset<%p> %-15s %pOF/%s\n", ce, action_names[ce->action], - ce->np, ce->prop->name); - break; - case OF_RECONFIG_ATTACH_NODE: - case OF_RECONFIG_DETACH_NODE: - pr_debug("cset<%p> %-15s %pOF\n", ce, action_names[ce->action], - ce->np); - break; - } -} -#else -static inline void __of_changeset_entry_dump(struct of_changeset_entry *ce) -{ - /* empty */ -} -#endif - static void __of_changeset_entry_invert(struct of_changeset_entry *ce, struct of_changeset_entry *rce) { @@ -599,7 +568,8 @@ static int __of_changeset_entry_apply(struct of_changeset_entry *ce) unsigned long flags; int ret = 0; - __of_changeset_entry_dump(ce); + if (pr_debug("changeset: applying: cset<%p> ", ce)) + of_changeset_action_print(ce->action, ce->np, ce->prop ? ce->prop->name : NULL); raw_spin_lock_irqsave(&devtree_lock, flags); switch (ce->action) { @@ -620,21 +590,9 @@ static int __of_changeset_entry_apply(struct of_changeset_entry *ce) } ret = __of_add_property(ce->np, ce->prop); - if (ret) { - pr_err("changeset: add_property failed @%pOF/%s\n", - ce->np, - ce->prop->name); - break; - } break; case OF_RECONFIG_REMOVE_PROPERTY: ret = __of_remove_property(ce->np, ce->prop); - if (ret) { - pr_err("changeset: remove_property failed @%pOF/%s\n", - ce->np, - ce->prop->name); - break; - } break; case OF_RECONFIG_UPDATE_PROPERTY: @@ -648,20 +606,17 @@ static int __of_changeset_entry_apply(struct of_changeset_entry *ce) } ret = __of_update_property(ce->np, ce->prop, &old_prop); - if (ret) { - pr_err("changeset: update_property failed @%pOF/%s\n", - ce->np, - ce->prop->name); - break; - } break; default: ret = -EINVAL; } raw_spin_unlock_irqrestore(&devtree_lock, flags); - if (ret) + if (ret) { + pr_err("changeset: apply failed: cset<%p> ", ce); + of_changeset_action_print(ce->action, ce->np, ce->prop ? ce->prop->name : NULL); return ret; + } switch (ce->action) { case OF_RECONFIG_ATTACH_NODE: