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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 2D180C43381 for ; Fri, 15 Feb 2019 02:36:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F0BB321927 for ; Fri, 15 Feb 2019 02:36:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550198198; bh=3Ofq+yH8oR3dBcfiUcgUXePwhupmTumFtJHdVDIGK4A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=LQqL1C42miHvXJONHzVZI5VVVmzdcPuGNZg6s18S38fd29XhLO2PDs3/b8IFHuO5E Wp4RV2qjwsctEiJS99/tQgIkcL97ktYOitq3UiyoM3J1wYH5aavomjdZzrwK5LQPkB CVa8mMuFEv0qsrUDz3nsIsXGRCtUrtUGKHR3hcoE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726139AbfBOCgg (ORCPT ); Thu, 14 Feb 2019 21:36:36 -0500 Received: from mail.kernel.org ([198.145.29.99]:50998 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731925AbfBOCKw (ORCPT ); Thu, 14 Feb 2019 21:10:52 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2BF22222D4; Fri, 15 Feb 2019 02:10:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550196651; bh=3Ofq+yH8oR3dBcfiUcgUXePwhupmTumFtJHdVDIGK4A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LBacrgFskLC4fbHGk7RB3qC5pZLJIuJRnYrYiw9eKa6oFm+/UDfb3o5tbLh7C3iwH cG4TreYin/5QmgcKnYXvEM/Wld9/wV611+8cMDwIeyxYUR2Hejcl/3zJlBKR+zarUn zQ0Ff9Z345lifmG5z/vUSp5x4617mZYZVbdoOJek= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Pavel Shilovsky , Steve French , Sasha Levin , linux-cifs@vger.kernel.org Subject: [PATCH AUTOSEL 4.20 65/77] CIFS: Do not assume one credit for async responses Date: Thu, 14 Feb 2019 21:08:43 -0500 Message-Id: <20190215020855.176727-65-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190215020855.176727-1-sashal@kernel.org> References: <20190215020855.176727-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Pavel Shilovsky [ Upstream commit 0fd1d37b0501efc6e295f56ab55cdaff784aa50c ] If we don't receive a response we can't assume that the server granted one credit. Assume zero credits in such cases. Signed-off-by: Pavel Shilovsky Reviewed-by: Ronnie Sahlberg Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/cifs/smb2pdu.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index d1ae7cdb236d..3c44c51310c4 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -2834,9 +2834,10 @@ smb2_echo_callback(struct mid_q_entry *mid) { struct TCP_Server_Info *server = mid->callback_data; struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf; - unsigned int credits_received = 1; + unsigned int credits_received = 0; - if (mid->mid_state == MID_RESPONSE_RECEIVED) + if (mid->mid_state == MID_RESPONSE_RECEIVED + || mid->mid_state == MID_RESPONSE_MALFORMED) credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest); DeleteMidQEntry(mid); @@ -3093,7 +3094,7 @@ smb2_readv_callback(struct mid_q_entry *mid) struct TCP_Server_Info *server = tcon->ses->server; struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)rdata->iov[0].iov_base; - unsigned int credits_received = 1; + unsigned int credits_received = 0; struct smb_rqst rqst = { .rq_iov = rdata->iov, .rq_nvec = 2, .rq_pages = rdata->pages, @@ -3132,6 +3133,9 @@ smb2_readv_callback(struct mid_q_entry *mid) task_io_account_read(rdata->got_bytes); cifs_stats_bytes_read(tcon, rdata->got_bytes); break; + case MID_RESPONSE_MALFORMED: + credits_received = le16_to_cpu(shdr->CreditRequest); + /* fall through */ default: if (rdata->result != -ENODATA) rdata->result = -EIO; @@ -3325,7 +3329,7 @@ smb2_writev_callback(struct mid_q_entry *mid) struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); unsigned int written; struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; - unsigned int credits_received = 1; + unsigned int credits_received = 0; switch (mid->mid_state) { case MID_RESPONSE_RECEIVED: @@ -3353,6 +3357,9 @@ smb2_writev_callback(struct mid_q_entry *mid) case MID_RETRY_NEEDED: wdata->result = -EAGAIN; break; + case MID_RESPONSE_MALFORMED: + credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest); + /* fall through */ default: wdata->result = -EIO; break; -- 2.19.1