From patchwork Tue Oct 1 07:48:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 11168123 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DF5961747 for ; Tue, 1 Oct 2019 07:48:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BD301215EA for ; Tue, 1 Oct 2019 07:48:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="ifEyUNqq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730344AbfJAHsm (ORCPT ); Tue, 1 Oct 2019 03:48:42 -0400 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:38051 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725777AbfJAHsm (ORCPT ); Tue, 1 Oct 2019 03:48:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1569916123; x=1601452123; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=v2Q56QGsThDWkYp0lqGTwVCLnA1aCvxt50v5W5nlbbA=; b=ifEyUNqqTH/V/+COa+RPFPe9mXRNaERLr3kYeHoO9Dzh2QFV6cnkDcGC zLD0YlJtkAiVY5rRKzR4RCrK2ecalG/Pf1dLhz3RiuMiJRyaGj2wJN1pg ZyhvpiWs+bmql2j7gFa4iavmuMtiX3fTy+j6DzWy5gb1RJ469bfBD2213 eD3+xnGhpGjtTM8sByeMTQpPrpWfJIX+v/nNmTSdM/xwORh7QBq9OV9SP aug/3onU3zbnpRxWfsVcpLHVjL9Ia/bO/8ZTq0VuHPgxlUaV4Qhr21np7 LZBhJ1qVc7BxojMZL+46lwjuSdugejQ9bTknAe6shT+PG7K1U3a7n2CsQ Q==; IronPort-SDR: 5MdZO5ofO5/5F5JCxr0WGQa6mdGENXCy753d1NPjypZPt8bAGBe7kvhNuy0mpoFmLSJaDVUwjS 9lULi4qV7Fi/lQlTuGtX+vALOK/A+omdgQ7xrzK2wQXiHaJ+LJpYiepGtiiWup/cbDmYw8xbyv RONaYJ1HS00M6Wcl9wc6d7fUXIq4mTu4RRYBMnRvxQajM6kG4vSuFv0ZU68GNfxQkfuFPyocE3 zD/HKW/asuAmRMk0KDRyvUlQKY9R6yi+YD2F74W8N4OeRzLW8sW1D+qqRb4MIAbgtRVsH/oOg8 ySY= X-IronPort-AV: E=Sophos;i="5.64,570,1559491200"; d="scan'208";a="123953338" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 01 Oct 2019 15:48:42 +0800 IronPort-SDR: 8+gLYXzig78BDfDrf4tlrsg5yfSGI/WCAGhmp/6U+/h8RdJ+dZlVInSYb/ya9Y9jXuIJzjfzRX 86GCJsAyhNAo3mHTKWRn+QhAJd4cMRlyQcj46yDRk94WgWzhvyA1OolSrxNXWEaErzFhb0J7eM XmKN/t3iB325oWOzoXZXRrxLyncJj8s3zW25vF9a637MVJVU6HwyoIlawQOFzw9yagTefJdyDV qQGDhisHdV4h+62u+5TZFEzgELpcqW6ZfYglP9wAJ5+g4ksavm3cFUjFpRF8x6WF4dCE2MgfYn 1XDlyERAAnS9bAU1vsA8SGhk Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Oct 2019 00:44:54 -0700 IronPort-SDR: b310TOzOTn06o9J5QoAFs5lXe1YHdnXbrqk87NAsItAyW8ZpnedNhxP+VHfT4HC7dndSf5FBzt 8Oq9e+xkA3XmBJbSQntxsxgOCn5DbFFIQoJys+aXOBOPbZKc4YcNaIWlKCuWM+2lBI93xJjIGW bpQF6xaFKH8ULiaaolAG6Idpe5oqlBelM1aOHxyO1xbpBO6FLgLQITIKmojRD2EsqVIfRhxPSa uzNjZVuI+ru5fSmtdd1aPUwTuosklKMI0CUTf/N/JzgQPGLq6JHLBIPhokPgrg7GxDR64qUCCX 3mI= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip01.wdc.com with ESMTP; 01 Oct 2019 00:48:41 -0700 From: Damien Le Moal To: linux-scsi@vger.kernel.org, "Martin K . Petersen" , linux-usb@vger.kernel.org, usb-storage@lists.one-eyed-alien.net, Alan Stern , Greg Kroah-Hartman Cc: Justin Piszcz Subject: [PATCH V3] scsi: save/restore command resid for error handling Date: Tue, 1 Oct 2019 16:48:39 +0900 Message-Id: <20191001074839.1994-1-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org When a non-passthrough command is terminated with CHECK CONDITION, request sense is executed by hijacking the command descriptor. Since scsi_eh_prep_cmnd() and scsi_eh_restore_cmnd() do not save/restore the original command resid, the value returned on failure of the original command is lost and replaced with the value set by the execution of the request sense command. This value may in many instances be unaligned to the device sector size, causing sd_done() to print a warning message about the incorrect unaligned resid before the command is retried. Fix this problem by saving the original command residual in struct scsi_eh_save using scsi_eh_prep_cmnd() and restoring it in scsi_eh_restore_cmnd(). In addition, to make sure that the request sense command is executed with a correctly initialized command structure, also reset the residual to 0 in scsi_eh_prep_cmnd() after saving the original command value in struct scsi_eh_save. Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal Reviewed-by: Bart Van Assche --- Changes from V2: * Open code resid save/restore to keep the functions style * rename struct scsi_eh_save resid field to resid_len to match struct scsi_request field name Changes from V1: * Dropped patch 2 * Add resid reset in scsi_eh_prep_cmnd() drivers/scsi/scsi_error.c | 3 +++ include/scsi/scsi_eh.h | 1 + 2 files changed, 4 insertions(+) diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 1c470e31ae81..ae2fa170f6ad 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -967,6 +967,7 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, ses->data_direction = scmd->sc_data_direction; ses->sdb = scmd->sdb; ses->result = scmd->result; + ses->resid_len = scmd->req.resid_len; ses->underflow = scmd->underflow; ses->prot_op = scmd->prot_op; ses->eh_eflags = scmd->eh_eflags; @@ -977,6 +978,7 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, memset(scmd->cmnd, 0, BLK_MAX_CDB); memset(&scmd->sdb, 0, sizeof(scmd->sdb)); scmd->result = 0; + scmd->req.resid_len = 0; if (sense_bytes) { scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, @@ -1029,6 +1031,7 @@ void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) scmd->sc_data_direction = ses->data_direction; scmd->sdb = ses->sdb; scmd->result = ses->result; + scmd->req.resid_len = ses->resid_len; scmd->underflow = ses->underflow; scmd->prot_op = ses->prot_op; scmd->eh_eflags = ses->eh_eflags; diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h index 3810b340551c..6bd5ed695a5e 100644 --- a/include/scsi/scsi_eh.h +++ b/include/scsi/scsi_eh.h @@ -32,6 +32,7 @@ extern int scsi_ioctl_reset(struct scsi_device *, int __user *); struct scsi_eh_save { /* saved state */ int result; + unsigned int resid_len; int eh_eflags; enum dma_data_direction data_direction; unsigned underflow;