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=-6.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 BE328C433E0 for ; Wed, 29 Jul 2020 14:13:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D4C02070B for ; Wed, 29 Jul 2020 14:13:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726838AbgG2ONB (ORCPT ); Wed, 29 Jul 2020 10:13:01 -0400 Received: from comms.puri.sm ([159.203.221.185]:48446 "EHLO comms.puri.sm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726449AbgG2ONA (ORCPT ); Wed, 29 Jul 2020 10:13:00 -0400 Received: from localhost (localhost [127.0.0.1]) by comms.puri.sm (Postfix) with ESMTP id 98206E01AF; Wed, 29 Jul 2020 07:12:29 -0700 (PDT) Received: from comms.puri.sm ([127.0.0.1]) by localhost (comms.puri.sm [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id myurcYJZk0Jy; Wed, 29 Jul 2020 07:12:28 -0700 (PDT) Subject: Re: [PATCH] scsi: sd: add runtime pm to open / release To: Alan Stern Cc: Bart Van Assche , jejb@linux.ibm.com, Can Guo , martin.petersen@oracle.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@puri.sm References: <20200706164135.GE704149@rowland.harvard.edu> <20200728200243.GA1511887@rowland.harvard.edu> From: Martin Kepplinger Autocrypt: addr=martin.kepplinger@puri.sm; keydata= mQINBFULfZABEADRxJqDOYAHfrp1w8Egcv88qoru37k1x0Ugy8S6qYtKLAAt7boZW+q5gPv3 Sj2KjfkWA7gotXpASN21OIfE/puKGwhDLAySY1DGNMQ0gIVakUO0ji5GJPjeB9JlmN5hbA87 Si9k3yKQQfv7Cf9Lr1iZaV4A4yjLP/JQMImaCVdC5KyqJ98Luwci1GbsLIGX3EEjfg1+MceO 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FmxNAJx7iiXaUY9KQ3snoEz3r37RxEDcvTY9KKahwxEzk2Mf58OPVaV4PEsRianrmErSUfmp l93agbtZK1r5LaxeItFOj+O2hWFLNDenJRlBYwXwlJCiHxM/O273hZZPoP8L5p54uXhaS5EJ uV2Xzgbi3VEbw3GZr+EnDC7XNE2wUrnlD/w2W6RzVYjVT6IX4SamNlV+MWX0/1fYCutfqZl8 6BSKmJjlWpfkPKzyzjhGQVZrTZYnKAu471hRv8/6Dx5JuZJgDCnYanNx3DDreRMu/nq6TfaO ekMtxgNYb/8oDry09UFHbGHLsWn6oBo= Message-ID: Date: Wed, 29 Jul 2020 16:12:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <20200728200243.GA1511887@rowland.harvard.edu> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 28.07.20 22:02, Alan Stern wrote: > On Tue, Jul 28, 2020 at 09:02:44AM +0200, Martin Kepplinger wrote: >> Hi Alan, >> >> Any API cleanup is of course welcome. I just wanted to remind you that >> the underlying problem: broken block device runtime pm. Your initial >> proposed fix "almost" did it and mounting works but during file access, >> it still just looks like a runtime_resume is missing somewhere. > > Well, I have tested that proposed fix several times, and on my system > it's working perfectly. When I stop accessing a drive it autosuspends, > and when I access it again it gets resumed and works -- as you would > expect. that's weird. when I mount, everything looks good, "sda1". But as soon as I cd to the mountpoint and do "ls" (on another SD card "ls" works but actual file reading leads to the exact same errors), I get: [ 77.474632] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08 cmd_age=0s [ 77.474647] sd 0:0:0:0: [sda] tag#0 Sense Key : 0x6 [current] [ 77.474655] sd 0:0:0:0: [sda] tag#0 ASC=0x28 ASCQ=0x0 [ 77.474667] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 00 60 40 00 00 01 00 [ 77.474678] blk_update_request: I/O error, dev sda, sector 24640 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0 [ 77.485836] sd 0:0:0:0: [sda] tag#0 device offline or changed [ 77.491628] blk_update_request: I/O error, dev sda, sector 24641 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0 [ 77.502275] sd 0:0:0:0: [sda] tag#0 device offline or changed [ 77.508051] blk_update_request: I/O error, dev sda, sector 24642 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0 [ 77.518651] sd 0:0:0:0: [sda] tag#0 device offline or changed (...) [ 77.947653] sd 0:0:0:0: [sda] tag#0 device offline or changed [ 77.953434] FAT-fs (sda1): Directory bread(block 16448) failed [ 77.959333] sd 0:0:0:0: [sda] tag#0 device offline or changed [ 77.965118] FAT-fs (sda1): Directory bread(block 16449) failed [ 77.971014] sd 0:0:0:0: [sda] tag#0 device offline or changed [ 77.976802] FAT-fs (sda1): Directory bread(block 16450) failed [ 77.982698] sd 0:0:0:0: [sda] tag#0 device offline or changed (...) [ 78.384929] FAT-fs (sda1): Filesystem has been set read-only [ 103.070973] sd 0:0:0:0: [sda] tag#0 device offline or changed [ 103.076751] print_req_error: 118 callbacks suppressed [ 103.076760] blk_update_request: I/O error, dev sda, sector 9748 op 0x1:(WRITE) flags 0x100000 phys_seg 1 prio class 0 [ 103.087428] Buffer I/O error on dev sda1, logical block 1556, lost async page write [ 103.095309] sd 0:0:0:0: [sda] tag#0 device offline or changed [ 103.101123] blk_update_request: I/O error, dev sda, sector 17162 op 0x1:(WRITE) flags 0x100000 phys_seg 1 prio class 0 [ 103.111883] Buffer I/O error on dev sda1, logical block 8970, lost async page write > >> As we need to have that working at some point, I might look into it, but >> someone who has experience in the block layer can surely do it more >> efficiently. > > I suspect that any problems you still face are caused by something else. > I then formatted sda1 to ext2 (on the runtime suspend system testing your patch) and that seems to have worked! Again accessing the mountpoint then yield the very same "device offline or changed" errors. What kind of device are you testing? You should be easily able to reproduce this using an "sd" device. The problems must lie in the different other drivers we use I guess. martin > Alan Stern >