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 X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AE7FEC433E2 for ; Tue, 1 Sep 2020 16:20:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 779CA20767 for ; Tue, 1 Sep 2020 16:20:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598977223; bh=qQYC96ys55bOwFktWPSHo6ffF8BCXRT989q4ofQBy+A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=BsltqErPu7oS9uB+g0hnP0oN4aJGiiOOwxHpdCjEvDCKPg2749CkXDrjaZ+s/yc1G LszqnhTX8ThOYYMi8zyV3p7Y7vEhBMhf4nWZrYU++zPcT19Av/jl3TCut2ZW0B0sST AEDqgrmpvDYJNPZz6Kl7qYKxOl0o2BOY0vLSK1sU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732015AbgIAQUV (ORCPT ); Tue, 1 Sep 2020 12:20:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:36600 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728122AbgIAPct (ORCPT ); Tue, 1 Sep 2020 11:32:49 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DEE8F205F4; Tue, 1 Sep 2020 15:32:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598974369; bh=qQYC96ys55bOwFktWPSHo6ffF8BCXRT989q4ofQBy+A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=N0TcwFLadBNAhPx8QLv01geEb/mqRGPhPbFoGph+UOeSxJkbsau3rNNUXam+jpo7I sqPDofJbV2eQloJM4DGNLcMXrSqnX5g3g0dpUdChUBQRWaTEhO0TKlSh8ZEhZlVhmO T0JMpungUoERsrOj52waBeof/bQOMZdlqGCyK4g4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Deal , Keith Busch , Bart Van Assche , Jens Axboe Subject: [PATCH 5.4 149/214] block: fix get_max_io_size() Date: Tue, 1 Sep 2020 17:10:29 +0200 Message-Id: <20200901151000.102818813@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150952.963606936@linuxfoundation.org> References: <20200901150952.963606936@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Keith Busch commit e4b469c66f3cbb81c2e94d31123d7bcdf3c1dabd upstream. A previous commit aligning splits to physical block sizes inadvertently modified one return case such that that it now returns 0 length splits when the number of sectors doesn't exceed the physical offset. This later hits a BUG in bio_split(). Restore the previous working behavior. Fixes: 9cc5169cd478b ("block: Improve physical block alignment of split bios") Reported-by: Eric Deal Signed-off-by: Keith Busch Cc: Bart Van Assche Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/blk-merge.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -154,7 +154,7 @@ static inline unsigned get_max_io_size(s if (max_sectors > start_offset) return max_sectors - start_offset; - return sectors & (lbs - 1); + return sectors & ~(lbs - 1); } static inline unsigned get_max_segment_size(const struct request_queue *q,