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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 2823BC28E85 for ; Mon, 15 Mar 2021 13:57:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0301864F2F for ; Mon, 15 Mar 2021 13:57:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229913AbhCON5O (ORCPT ); Mon, 15 Mar 2021 09:57:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:57250 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231371AbhCONyH (ORCPT ); Mon, 15 Mar 2021 09:54:07 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3CEEA64DAD; Mon, 15 Mar 2021 13:54:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816446; bh=Jxe9prs1CF4dxDsqTe6EZaGsQXBFlpoScv7ixbKpeVM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OkID29cfNCT5ZEKL4CV6pzUM52/QR9Ds/fnv+ZxwFJ+Bdlu6fQk1NBgt1/azXbzcc CcA3ZoKTh4gcuzLxmJyyDhbUxtFmoU0ZGAwPUXOjzHI8YATNMLa9MV7AE7sQVABCG4 37yk6F68xX2kVCM8AZhSGnWOx8ZVVxPxVtJc5QZ0= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ian Abbott Subject: [PATCH 4.4 49/75] staging: comedi: addi_apci_1032: Fix endian problem for COS sample Date: Mon, 15 Mar 2021 14:52:03 +0100 Message-Id: <20210315135209.852379982@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135208.252034256@linuxfoundation.org> References: <20210315135208.252034256@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Greg Kroah-Hartman From: Ian Abbott commit 25317f428a78fde71b2bf3f24d05850f08a73a52 upstream. The Change-Of-State (COS) subdevice supports Comedi asynchronous commands to read 16-bit change-of-state values. However, the interrupt handler is calling `comedi_buf_write_samples()` with the address of a 32-bit integer `&s->state`. On bigendian architectures, it will copy 2 bytes from the wrong end of the 32-bit integer. Fix it by transferring the value via a 16-bit integer. Fixes: 6bb45f2b0c86 ("staging: comedi: addi_apci_1032: use comedi_buf_write_samples()") Cc: # 3.19+ Signed-off-by: Ian Abbott Link: https://lore.kernel.org/r/20210223143055.257402-2-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/addi_apci_1032.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/staging/comedi/drivers/addi_apci_1032.c +++ b/drivers/staging/comedi/drivers/addi_apci_1032.c @@ -269,6 +269,7 @@ static irqreturn_t apci1032_interrupt(in struct apci1032_private *devpriv = dev->private; struct comedi_subdevice *s = dev->read_subdev; unsigned int ctrl; + unsigned short val; /* check interrupt is from this device */ if ((inl(devpriv->amcc_iobase + AMCC_OP_REG_INTCSR) & @@ -284,7 +285,8 @@ static irqreturn_t apci1032_interrupt(in outl(ctrl & ~APCI1032_CTRL_INT_ENA, dev->iobase + APCI1032_CTRL_REG); s->state = inl(dev->iobase + APCI1032_STATUS_REG) & 0xffff; - comedi_buf_write_samples(s, &s->state, 1); + val = s->state; + comedi_buf_write_samples(s, &val, 1); comedi_handle_events(dev, s); /* enable the interrupt */