From patchwork Wed Nov 1 09:00:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?SsO8cmdlbiBHcm/Dnw==?= X-Patchwork-Id: 13442612 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3CA91C4332F for ; Wed, 1 Nov 2023 09:01:05 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.626149.976141 (Exim 4.92) (envelope-from ) id 1qy75c-0006T5-Uc; Wed, 01 Nov 2023 09:00:40 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 626149.976141; Wed, 01 Nov 2023 09:00:40 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qy75c-0006Sk-R7; Wed, 01 Nov 2023 09:00:40 +0000 Received: by outflank-mailman (input) for mailman id 626149; Wed, 01 Nov 2023 09:00:39 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qy75b-0005dE-DC for xen-devel@lists.xenproject.org; Wed, 01 Nov 2023 09:00:39 +0000 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 2082a0ac-7895-11ee-98d6-6d05b1d4d9a1; Wed, 01 Nov 2023 10:00:38 +0100 (CET) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 71AB821862; Wed, 1 Nov 2023 09:00:38 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 4548C13460; Wed, 1 Nov 2023 09:00:38 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id CKqxD7YTQmWeeQAAMHmgww (envelope-from ); Wed, 01 Nov 2023 09:00:38 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 2082a0ac-7895-11ee-98d6-6d05b1d4d9a1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1698829238; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BBCYYLq8RLRTC07yvHLcGeOw7lLnh2hUZttfKIwKhhk=; b=kmvqIvyZZbyed7wfK0z8dsqPN9cEhkgdaSxvM8FaTMZpp3gpQsfOkvn8lUqV+c3r7lpafG GW8iPSd7PGh454KuPgwiYRSYzhAkzNGbZqil6jR0hecUowX45BSF9offJrvY9fKFLsKfZ/ n1sW3HxwvzuFnJykVodU1BWGf1CMTXY= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, wl@xen.org, Juergen Gross Subject: [PATCH 2/3] Mini-OS: don't crash if no shutdown node is available Date: Wed, 1 Nov 2023 10:00:23 +0100 Message-Id: <20231101090024.28934-3-jgross@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20231101090024.28934-1-jgross@suse.com> References: <20231101090024.28934-1-jgross@suse.com> MIME-Version: 1.0 It might be perfectly fine not to have a control/shutdown Xenstore node. If this is the case, don't crash, but just terminate the shutdown thread after issuing a message that shutdown isn't available. In fini_shutdown() clearing the watch can result in an error now, in case the early exit above was taken. Just ignore this error now. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- shutdown.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/shutdown.c b/shutdown.c index bb2c6f11..ded6b64d 100644 --- a/shutdown.c +++ b/shutdown.c @@ -75,7 +75,9 @@ static void shutdown_thread(void *p) xenbus_wait_for_watch(&events); if ((err = xenbus_read(XBT_NIL, path, &shutdown))) { free(err); - do_exit(); + free(xenbus_unwatch_path_token(XBT_NIL, path, token)); + printk("Shutdown Xenstore node not available.\n"); + return; } if (end_shutdown_thread) @@ -117,15 +119,9 @@ void init_shutdown(void) void fini_shutdown(void) { - char *err; - end_shutdown_thread = 1; xenbus_release_wait_for_watch(&events); - err = xenbus_unwatch_path_token(XBT_NIL, path, token); - if (err) { - free(err); - do_exit(); - } + free(xenbus_unwatch_path_token(XBT_NIL, path, token)); } #endif