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 BB6B7C7EE43 for ; Mon, 12 Jun 2023 10:51:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234931AbjFLKvy (ORCPT ); Mon, 12 Jun 2023 06:51:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55684 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234985AbjFLKvf (ORCPT ); Mon, 12 Jun 2023 06:51:35 -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 2D643902A for ; Mon, 12 Jun 2023 03:35:59 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id AD6A8623E7 for ; Mon, 12 Jun 2023 10:35:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BCA8EC4339B; Mon, 12 Jun 2023 10:35:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1686566157; bh=ydreA1rPmJuAPDbIB631KtY+U4yg59AGmeNR+zn6zCo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y69VNuOu5UMCw0VBVJQqKH6Ievzxz8ai5iR7EEFgCrDqqSvYU9AuYxfk3LhRxul/I JSp2J+kqDTH70XlVXyjIyYpcDLviCQEkpiXrM8cOVWBiWbAv1Kvjs4H3KgpbXjXFmg m6vjIW210Mr/V6ltRk0ZLcyrnhjtPe7L+2g5Bh14= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Qilin Tan , Chao Yu , Jaegeuk Kim , Daniel Rosenberg Subject: [PATCH 5.15 09/91] f2fs: fix iostat lock protection Date: Mon, 12 Jun 2023 12:25:58 +0200 Message-ID: <20230612101702.474354291@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230612101702.085813286@linuxfoundation.org> References: <20230612101702.085813286@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Qilin Tan commit 144f1cd40bf91fb3ac1d41806470756ce774f389 upstream. Made iostat lock irq safe to avoid potentinal deadlock. Deadlock scenario: f2fs_attr_store -> f2fs_sbi_store -> _sbi_store -> spin_lock(sbi->iostat_lock) -> scsi_end_request -> bio_endio -> f2fs_dio_read_end_io -> f2fs_update_iostat -> spin_lock_irqsave(sbi->iostat_lock) ===> Dead lock here Fixes: 61803e984307 ("f2fs: fix iostat related lock protection") Fixes: a1e09b03e6f5 ("f2fs: use iomap for direct I/O") Signed-off-by: Qilin Tan Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Cc: Daniel Rosenberg Signed-off-by: Greg Kroah-Hartman --- fs/f2fs/sysfs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -491,9 +491,9 @@ out: if (!strcmp(a->attr.name, "iostat_period_ms")) { if (t < MIN_IOSTAT_PERIOD_MS || t > MAX_IOSTAT_PERIOD_MS) return -EINVAL; - spin_lock(&sbi->iostat_lock); + spin_lock_irq(&sbi->iostat_lock); sbi->iostat_period_ms = (unsigned int)t; - spin_unlock(&sbi->iostat_lock); + spin_unlock_irq(&sbi->iostat_lock); return count; } #endif