From mboxrd@z Thu Jan 1 00:00:00 1970 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 3419EC43334 for ; Mon, 18 Jul 2022 18:09:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235158AbiGRSJO (ORCPT ); Mon, 18 Jul 2022 14:09:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51642 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235834AbiGRSJI (ORCPT ); Mon, 18 Jul 2022 14:09:08 -0400 Received: from out5-smtp.messagingengine.com (out5-smtp.messagingengine.com [66.111.4.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6D3FD101E8; Mon, 18 Jul 2022 11:09:07 -0700 (PDT) Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.nyi.internal (Postfix) with ESMTP id A70405C00C5; Mon, 18 Jul 2022 14:09:06 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute5.internal (MEProxy); Mon, 18 Jul 2022 14:09:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= invisiblethingslab.com; h=cc:cc:content-transfer-encoding:date :date:from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:sender:subject:subject:to:to; s=fm3; t= 1658167746; x=1658254146; bh=9EVYFQs3TfjexPazUkgkLFWSM4eN+61vSya zDvU3JXY=; b=D3Otbn+w9zgEgOzUpLm3pClk07nfXG50Dt/6CcsQlNjM9PfPEz/ VbuvRVBlrYrrgZbD+HDhBHLUoywquEgh+6OfGTao9Ko1zYukMfuUyIzm1W4dcPE0 zI6dGadXxfzLNzyQLGjNjAsm2S2v4Iih7ZQ0w1p6HAYPmcne0ppKhfgnY5w3+CtZ zmZnknZx6t/1DTrpzWypMruZKd16AJGfKgK1dqcc/EUwuXkJpJANAkv/xjTNZhGb bXUrBtexNOxCB1T+y706BXIoKRvJeiBVPPQmg9eYzSqKnRhQNFORzcSYIB2zxgDA 0Yo8pmLdFhyZugbg+JrveMK5kpXQ7YmLmYQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding:date:date :feedback-id:feedback-id:from:from:in-reply-to:in-reply-to :message-id:mime-version:references:reply-to:sender:subject :subject:to:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm3; t=1658167746; x=1658254146; bh=9EVYFQs3Tfjex PazUkgkLFWSM4eN+61vSyazDvU3JXY=; b=KWVz+WBPo4wOHR+z4RZpBCV9hQosu o3HEjIvXLc49G0rE6pJ14HFj+Idp8hNanjbdKg0w0uXReFUVX/wDKviIOcSWH2i9 q2jlTrJE/Y5bqUD2ObM+QJjd86FCL/fKGlHHzZSrJL+FsbJDXst00vYIieKZpt6G 2hXepp5R9NZul/A2G6bRv/hgb+gEhTJX3+wyoa3y7gbmh8olfLA8ZXyFwLkEnq3z UrsbW1jYLF2faP2vQpwzUjWLsKm3pFgXWC4aXq7zFHGtjdtXMMWoVKbOGdDd20qc luNBVYlkia5VgIBy1e+MojiSms9YuvlUU0PmtYZuF04vNfIDh2zKOKYYA== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvfedrudekkedguddulecutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfgh necuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd enucfjughrpefhvfevufffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpeffvghm ihcuofgrrhhivgcuqfgsvghnohhurhcuoeguvghmihesihhnvhhishhisghlvghthhhinh hgshhlrggsrdgtohhmqeenucggtffrrghtthgvrhhnpeejffejgffgueegudevvdejkefg hefghffhffejteekleeufeffteffhfdtudehteenucevlhhushhtvghrufhiiigvpedtne curfgrrhgrmhepmhgrihhlfhhrohhmpeguvghmihesihhnvhhishhisghlvghthhhinhhg shhlrggsrdgtohhm X-ME-Proxy: Feedback-ID: iac594737:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 18 Jul 2022 14:09:05 -0400 (EDT) From: Demi Marie Obenour To: Boris Ostrovsky , Juergen Gross , Stefano Stabellini , Greg Kroah-Hartman Cc: Demi Marie Obenour , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH 1/5] Ignore failure to unmap -1 Date: Mon, 18 Jul 2022 14:08:18 -0400 Message-Id: <20220718180820.2555-2-demi@invisiblethingslab.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220718180820.2555-1-demi@invisiblethingslab.com> References: <20220718180820.2555-1-demi@invisiblethingslab.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 166d3863231667c4f64dee72b77d1102cdfad11f ] The error paths of gntdev_mmap() can call unmap_grant_pages() even though not all of the pages have been successfully mapped. This will trigger the WARN_ON()s in __unmap_grant_pages_done(). The number of warnings can be very large; I have observed thousands of lines of warnings in the systemd journal. Avoid this problem by only warning on unmapping failure if the handle being unmapped is not -1. The handle field of any page that was not successfully mapped will be -1, so this catches all cases where unmapping can legitimately fail. Suggested-by: Juergen Gross Cc: stable@vger.kernel.org Signed-off-by: Demi Marie Obenour Fixes: 36cd49b071fc ("xen/gntdev: Avoid blocking in unmap_grant_pages()") --- drivers/xen/gntdev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 2c3248e71e9c1a3e032b847d177b02855cdda1a1..a6585854a85fc6fffc16c3498ba73fbee84ad6ca 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -390,7 +390,8 @@ static void __unmap_grant_pages_done(int result, unsigned int offset = data->unmap_ops - map->unmap_ops; for (i = 0; i < data->count; i++) { - WARN_ON(map->unmap_ops[offset+i].status); + WARN_ON(map->unmap_ops[offset+i].status && + map->unmap_ops[offset+i].handle != -1); pr_debug("unmap handle=%d st=%d\n", map->unmap_ops[offset+i].handle, map->unmap_ops[offset+i].status); -- Sincerely, Demi Marie Obenour (she/her/hers) Invisible Things Lab