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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 D4B54CA9EBC for ; Sat, 26 Oct 2019 13:28:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AAA5B20867 for ; Sat, 26 Oct 2019 13:28:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572096527; bh=ZbaRqPpNCSUJatQuWjo3ZGisq+XCjNCR5k/e3FVr3B4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SlwEu8hRxaA5xeUBbUFCZ0gtPz0MpfLgYH3LH1IUn97wFbxXF/VwzoeeRf71YSCve QsYPlhK1+YlcmHQQzOFEpPMk/qTrRHWxCC3oyI2W8o4tjtX1HscbTj6yRWOSJzg4jJ ChycBtMh7Hw23/EILYsgPl+QtXiRBhJA1ECccAyE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728868AbfJZN2o (ORCPT ); Sat, 26 Oct 2019 09:28:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:42594 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727573AbfJZNUx (ORCPT ); Sat, 26 Oct 2019 09:20:53 -0400 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 ECA8D206DD; Sat, 26 Oct 2019 13:20:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572096052; bh=ZbaRqPpNCSUJatQuWjo3ZGisq+XCjNCR5k/e3FVr3B4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oiXaxECsqooSHFBzrssbij67lwOBn0rbb01w6GyZXzH3R5djcxa/jwXotgOHZrsxO yXOWeliJmgrwa2KmhSsO2NidUPLAy4J43yWc9ujLMhZN8jSUdd5pjNDoW3scozJ6tq ugvSbz+0qFmkRAghTnHDVnV7+BJk5FeD3H45NqxY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Oliver Neukum , "David S . Miller" , Sasha Levin , linux-usb@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 52/59] usb: hso: obey DMA rules in tiocmget Date: Sat, 26 Oct 2019 09:19:03 -0400 Message-Id: <20191026131910.3435-52-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191026131910.3435-1-sashal@kernel.org> References: <20191026131910.3435-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Oliver Neukum [ Upstream commit af0de1303c4e8f44fadd7b4c593f09f22324b04f ] The serial state information must not be embedded into another data structure, as this interferes with cache handling for DMA on architectures without cache coherence.. That would result in data corruption on some architectures Allocating it separately. v2: fix syntax error Signed-off-by: Oliver Neukum Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/usb/hso.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c index 5251c5f6f96ed..a7b612f6470cb 100644 --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -200,7 +200,7 @@ struct hso_tiocmget { int intr_completed; struct usb_endpoint_descriptor *endp; struct urb *urb; - struct hso_serial_state_notification serial_state_notification; + struct hso_serial_state_notification *serial_state_notification; u16 prev_UART_state_bitmap; struct uart_icount icount; }; @@ -1446,7 +1446,7 @@ static int tiocmget_submit_urb(struct hso_serial *serial, usb_rcvintpipe(usb, tiocmget->endp-> bEndpointAddress & 0x7F), - &tiocmget->serial_state_notification, + tiocmget->serial_state_notification, sizeof(struct hso_serial_state_notification), tiocmget_intr_callback, serial, tiocmget->endp->bInterval); @@ -1493,7 +1493,7 @@ static void tiocmget_intr_callback(struct urb *urb) /* wIndex should be the USB interface number of the port to which the * notification applies, which should always be the Modem port. */ - serial_state_notification = &tiocmget->serial_state_notification; + serial_state_notification = tiocmget->serial_state_notification; if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE || serial_state_notification->bNotification != B_NOTIFICATION || le16_to_cpu(serial_state_notification->wValue) != W_VALUE || @@ -2579,6 +2579,8 @@ static void hso_free_tiomget(struct hso_serial *serial) usb_free_urb(tiocmget->urb); tiocmget->urb = NULL; serial->tiocmget = NULL; + kfree(tiocmget->serial_state_notification); + tiocmget->serial_state_notification = NULL; kfree(tiocmget); } } @@ -2629,10 +2631,13 @@ static struct hso_device *hso_create_bulk_serial_device( num_urbs = 2; serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget), GFP_KERNEL); + serial->tiocmget->serial_state_notification + = kzalloc(sizeof(struct hso_serial_state_notification), + GFP_KERNEL); /* it isn't going to break our heart if serial->tiocmget * allocation fails don't bother checking this. */ - if (serial->tiocmget) { + if (serial->tiocmget && serial->tiocmget->serial_state_notification) { tiocmget = serial->tiocmget; tiocmget->endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT, -- 2.20.1