From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756871AbdCHGY4 (ORCPT ); Wed, 8 Mar 2017 01:24:56 -0500 Received: from userp1050.oracle.com ([156.151.31.82]:37529 "EHLO userp1050.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750799AbdCHGYz (ORCPT ); Wed, 8 Mar 2017 01:24:55 -0500 Date: Wed, 8 Mar 2017 09:22:06 +0300 From: Dan Carpenter To: Andrea Ghittino Cc: aditya.shankar@microchip.com, ganesh.krishna@microchip.com, gregkh@linuxfoundation.org, linux-wireless@vger.kernel.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] staging: wilc1000: Fix sparse warnings incorrect type assignment Message-ID: <20170308062206.GV4171@mwanda> References: <20170307213641.GA4193@myhd3> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170307213641.GA4193@myhd3> User-Agent: Mutt/1.5.21 (2010-09-15) X-Source-IP: userp1040.oracle.com [156.151.31.81] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I think this change is buggy. On Tue, Mar 07, 2017 at 10:36:53PM +0100, Andrea Ghittino wrote: > Fixed sparse warnings related to the conversion of le16 and le32 to u16 and u32, during the update of internal structures > > Fixed sparse warnings: > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2011:52: warning: incorrect type in assignment (different base types) > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2011:52: expected unsigned short [unsigned] [assigned] [usertype] ht_ext_params > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2011:52: got restricted __le16 const [usertype] extended_ht_cap_info > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2012:51: warning: incorrect type in assignment (different base types) > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2012:51: expected unsigned int [unsigned] [assigned] [usertype] ht_tx_bf_cap > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2012:51: got restricted __le32 const [usertype] tx_BF_cap_info > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2078:51: warning: incorrect type in assignment (different base types) > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2078:51: expected unsigned short [unsigned] [assigned] [usertype] ht_capa_info > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2078:51: got restricted __le16 const [usertype] cap_info > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2083:52: warning: incorrect type in assignment (different base types) > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2083:52: expected unsigned short [unsigned] [assigned] [usertype] ht_ext_params > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2083:52: got restricted __le16 const [usertype] extended_ht_cap_info > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2084:51: warning: incorrect type in assignment (different base types) > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2084:51: expected unsigned int [unsigned] [assigned] [usertype] ht_tx_bf_cap > drivers/staging/wilc1000//wilc_wfi_cfgoperations.c:2084:51: got restricted __le32 const [usertype] tx_BF_cap_info > What I want in a changelog is: "We're copying data that's little endian from (some place) to where ever and then we (whatever) do math using the variable so it needs to be CPU endian. Presumably this wasn't caught in testing because it was only used on x86 or other little endian systems." In this case we're copying little endian data and then sending it directly back to some place which requires little endian data so converting it is a bug. regards, dan carpenter