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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 4CFC4C10F11 for ; Wed, 24 Apr 2019 17:16:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1465921905 for ; Wed, 24 Apr 2019 17:16:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556126214; bh=m5ST6p3HzZAzLfyAyK6h0UVxArB6OQ1zpGSw1iKseaA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SWKJoF00QDeNU7lCJDNbEj4OJWBtb8kd0sdrW8CCEGqn+/EYQljTc0lmWmn3sMuCE KeNNsEMtHUDIHVaOjV5iS4Zzkf7KucsC41z3a6Q5zvbuA0RWE/in/hjNJMpxzFEPBj BjKI8/3kFXBAARA4VQ3L77ZPbzkfOtYLq/+rz6rc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388509AbfDXRQw (ORCPT ); Wed, 24 Apr 2019 13:16:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:41492 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388495AbfDXRQt (ORCPT ); Wed, 24 Apr 2019 13:16:49 -0400 Received: from localhost (62-193-50-229.as16211.net [62.193.50.229]) (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 C95DE2190A; Wed, 24 Apr 2019 17:16:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556126208; bh=m5ST6p3HzZAzLfyAyK6h0UVxArB6OQ1zpGSw1iKseaA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VjDsbGJJhJEioERYecZKcrYKIg2G+lXTbJNgKgGovpG4u1aGhIP3vB4KHkdlyXDNH Rn/eVsRSlRof5HqCG06e5GTnPZ3WR3uhh5zs+BeMnmYYwoL/Y8Ydycp02F5Mxo13NQ 1V3/migTljnwDkmbeIZCkCFYnbx8l11tnmNYRu6M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Benjamin Block , Bart Van Assche , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.4 029/168] scsi: core: replace GFP_ATOMIC with GFP_KERNEL in scsi_scan.c Date: Wed, 24 Apr 2019 19:07:53 +0200 Message-Id: <20190424170925.413918019@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190424170923.452349382@linuxfoundation.org> References: <20190424170923.452349382@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 [ Upstream commit 1749ef00f7312679f76d5e9104c5d1e22a829038 ] We had a test-report where, under memory pressure, adding LUNs to the systems would fail (the tests add LUNs strictly in sequence): [ 5525.853432] scsi 0:0:1:1088045124: Direct-Access IBM 2107900 .148 PQ: 0 ANSI: 5 [ 5525.853826] scsi 0:0:1:1088045124: alua: supports implicit TPGS [ 5525.853830] scsi 0:0:1:1088045124: alua: device naa.6005076303ffd32700000000000044da port group 0 rel port 43 [ 5525.853931] sd 0:0:1:1088045124: Attached scsi generic sg10 type 0 [ 5525.854075] sd 0:0:1:1088045124: [sdk] Disabling DIF Type 1 protection [ 5525.855495] sd 0:0:1:1088045124: [sdk] 2097152 512-byte logical blocks: (1.07 GB/1.00 GiB) [ 5525.855606] sd 0:0:1:1088045124: [sdk] Write Protect is off [ 5525.855609] sd 0:0:1:1088045124: [sdk] Mode Sense: ed 00 00 08 [ 5525.855795] sd 0:0:1:1088045124: [sdk] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 5525.857838] sdk: sdk1 [ 5525.859468] sd 0:0:1:1088045124: [sdk] Attached SCSI disk [ 5525.865073] sd 0:0:1:1088045124: alua: transition timeout set to 60 seconds [ 5525.865078] sd 0:0:1:1088045124: alua: port group 00 state A preferred supports tolusnA [ 5526.015070] sd 0:0:1:1088045124: alua: port group 00 state A preferred supports tolusnA [ 5526.015213] sd 0:0:1:1088045124: alua: port group 00 state A preferred supports tolusnA [ 5526.587439] scsi_alloc_sdev: Allocation failure during SCSI scanning, some SCSI devices might not be configured [ 5526.588562] scsi_alloc_sdev: Allocation failure during SCSI scanning, some SCSI devices might not be configured Looking at the code of scsi_alloc_sdev(), and all the calling contexts, there seems to be no reason to use GFP_ATMOIC here. All the different call-contexts use a mutex at some point, and nothing in between that requires no sleeping, as far as I could see. Additionally, the code that later allocates the block queue for the device (scsi_mq_alloc_queue()) already uses GFP_KERNEL. There are similar allocations in two other functions: scsi_probe_and_add_lun(), and scsi_add_lun(),; that can also be done with GFP_KERNEL. Here is the contexts for the three functions so far: scsi_alloc_sdev() scsi_probe_and_add_lun() scsi_sequential_lun_scan() __scsi_scan_target() scsi_scan_target() mutex_lock() scsi_scan_channel() scsi_scan_host_selected() mutex_lock() scsi_report_lun_scan() __scsi_scan_target() ... __scsi_add_device() mutex_lock() __scsi_scan_target() ... scsi_report_lun_scan() ... scsi_get_host_dev() mutex_lock() scsi_probe_and_add_lun() ... scsi_add_lun() scsi_probe_and_add_lun() ... So replace all these, and give them a bit of a better chance to succeed, with more chances of reclaim. Signed-off-by: Benjamin Block Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/scsi_scan.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 850ddc5fac04..3e2288af56bc 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -217,7 +217,7 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, extern void scsi_requeue_run_queue(struct work_struct *work); sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, - GFP_ATOMIC); + GFP_KERNEL); if (!sdev) goto out; @@ -791,7 +791,7 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, */ sdev->inquiry = kmemdup(inq_result, max_t(size_t, sdev->inquiry_len, 36), - GFP_ATOMIC); + GFP_KERNEL); if (sdev->inquiry == NULL) return SCSI_SCAN_NO_RESPONSE; @@ -1085,7 +1085,7 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget, if (!sdev) goto out; - result = kmalloc(result_len, GFP_ATOMIC | + result = kmalloc(result_len, GFP_KERNEL | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); if (!result) goto out_free_sdev; -- 2.19.1