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=-8.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 2949EC4743C for ; Wed, 23 Jun 2021 09:36:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0A0296113B for ; Wed, 23 Jun 2021 09:36:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230064AbhFWJi7 (ORCPT ); Wed, 23 Jun 2021 05:38:59 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:53720 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230052AbhFWJi6 (ORCPT ); Wed, 23 Jun 2021 05:38:58 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id E4E4B1FD36; Wed, 23 Jun 2021 09:36:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1624441000; 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; bh=B3yGronjW0nUO0aLALGsc0prv7Le7k4F1EVYjzK66pY=; b=p5foeXCvzWTTNBFuGNJQmWDTsHsNx2DHy/Ue561cXlL5IPuMjDFTzlWN1j7fFjg2GZwtWq hxDfB0d+lqMm6r2ZLSJxbWHEbkLJlx/5D1iiDf/uzxFIj6Hk84gTT0+R1gHP9ty/OoAxbB 0hrNov62aLtrMz0S0dQf9j342I/YTyg= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1624441000; 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; bh=B3yGronjW0nUO0aLALGsc0prv7Le7k4F1EVYjzK66pY=; b=4aF1j7zSB6G910DyACIV5c3x2/J9AiZSMcnu5wPbjBwMm6xunTBkvC7bSgqzQ65ISoCWO+ blN8WTDZzGTOygAw== Received: from quack2.suse.cz (unknown [10.100.224.230]) by relay2.suse.de (Postfix) with ESMTP id 87AD8A3B81; Wed, 23 Jun 2021 09:36:40 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id C9B351E14B4; Wed, 23 Jun 2021 11:36:38 +0200 (CEST) From: Jan Kara To: Jens Axboe Cc: , Paolo Valente , Jan Kara Subject: [PATCH 0/2 v4] block: Fix deadlock when merging requests with BFQ Date: Wed, 23 Jun 2021 11:36:32 +0200 Message-Id: <20210623093634.27879-1-jack@suse.cz> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=676; h=from:subject; bh=rOwuffjf5h0SlNV+SFdGKT8xWFlDcIoa04XVgjw8qLQ=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBg0wCXz4NBg3y3hQ5iQ/EcRIIVHvwuZ4R9Y5UCQzia 3aHvdx6JATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCYNMAlwAKCRCcnaoHP2RA2ZquCA CT/HB16tbNjIN6CqK1FNkvimoPZbOFfliTB6+i6QJZIv+A3xV2JuujVD9jHtUn4SAeTMOWoi9zXYFs UDgMxJvqc+aiDgr3MEWJ9Cw9mJmizmxP7LnT4XYg90o3RYzrcUGhPocB52XqmMmc0k552CJg0CQQwe H/hRsSzEAOJI6KdLr/lmAoRCKJty3rXfzDgZWBgtlcN5K1e7ywuoahcsgaLVRddRJ7bNSsBOzMXPX3 v8rACTSj1+N8eS2+apK3+i5itr8RzJFs96iL4a83ryFtENA9dZdn7oSo6kma0j0nA0Uai80ofVnQCe gUaqLhxaK3QSKz5Jj4l1I17V/nzRJ1 X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hello, This patch series fixes a lockdep complaint and a possible deadlock that can happen when blk_mq_sched_try_insert_merge() merges and frees a request. Jens, can you please merge the series? It seems to have slipped through last time when I posted it. Thanks! Changes since v3: * Rebased on top of for-next branch in axboe/linux-block.git Changes since v2: * Added reviewed-by tags Changes since v1: * Remove patch disabling recursing request merging during request insertion * Modified BFQ to cleanup merged request already in its .merge_requests handler * Added code to handle multiple requests that need freeing after being merged Honza