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Tue, 21 Jul 2020 15:06:57 +0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 06LF6sv924510804 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 21 Jul 2020 15:06:55 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E067B5204F; Tue, 21 Jul 2020 15:06:54 +0000 (GMT) Received: from linux.ibm.com (unknown [9.148.205.118]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTPS id 38B0C52052; Tue, 21 Jul 2020 15:06:54 +0000 (GMT) Date: Tue, 21 Jul 2020 18:06:52 +0300 From: Mike Rapoport To: "Ruhl, Michael J" Subject: Re: [PATCH] io-mapping: Indicate mapping failure Message-ID: <20200721150652.GI802087@linux.ibm.com> References: <20200721141641.81112-1-michael.j.ruhl@intel.com> <20200721141641.81112-2-michael.j.ruhl@intel.com> <20200721144722.GH3703480@smile.fi.intel.com> <14063C7AD467DE4B82DEDB5C278E866301245DF505@FMSMSX108.amr.corp.intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <14063C7AD467DE4B82DEDB5C278E866301245DF505@FMSMSX108.amr.corp.intel.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-07-21_09:2020-07-21, 2020-07-21 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 mlxlogscore=999 malwarescore=0 priorityscore=1501 adultscore=0 mlxscore=0 impostorscore=0 bulkscore=0 phishscore=0 lowpriorityscore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007210107 X-Mailman-Approved-At: Wed, 22 Jul 2020 07:02:50 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrew Morton , Andy Shevchenko , "stable@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , Chris Wilson Content-Type: text/plain; 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Tue, 21 Jul 2020 15:06:57 GMT Received: from b06cxnps3074.portsmouth.uk.ibm.com (d06relay09.portsmouth.uk.ibm.com [9.149.109.194]) by ppma02fra.de.ibm.com with ESMTP id 32brq7v40a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Jul 2020 15:06:57 +0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 06LF6sv924510804 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 21 Jul 2020 15:06:55 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E067B5204F; Tue, 21 Jul 2020 15:06:54 +0000 (GMT) Received: from linux.ibm.com (unknown [9.148.205.118]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTPS id 38B0C52052; Tue, 21 Jul 2020 15:06:54 +0000 (GMT) Date: Tue, 21 Jul 2020 18:06:52 +0300 From: Mike Rapoport To: "Ruhl, Michael J" Cc: Andy Shevchenko , "dri-devel@lists.freedesktop.org" , Andrew Morton , Chris Wilson , "stable@vger.kernel.org" Subject: Re: [PATCH] io-mapping: Indicate mapping failure Message-ID: <20200721150652.GI802087@linux.ibm.com> References: <20200721141641.81112-1-michael.j.ruhl@intel.com> <20200721141641.81112-2-michael.j.ruhl@intel.com> <20200721144722.GH3703480@smile.fi.intel.com> <14063C7AD467DE4B82DEDB5C278E866301245DF505@FMSMSX108.amr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <14063C7AD467DE4B82DEDB5C278E866301245DF505@FMSMSX108.amr.corp.intel.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-07-21_09:2020-07-21,2020-07-21 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 mlxlogscore=999 malwarescore=0 priorityscore=1501 adultscore=0 mlxscore=0 impostorscore=0 bulkscore=0 phishscore=0 lowpriorityscore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007210107 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Tue, Jul 21, 2020 at 03:00:41PM +0000, Ruhl, Michael J wrote: > >-----Original Message----- > >From: Andy Shevchenko > >Sent: Tuesday, July 21, 2020 10:47 AM > >To: Ruhl, Michael J > >Cc: dri-devel@lists.freedesktop.org; Andrew Morton >foundation.org>; Mike Rapoport ; Chris Wilson > >; stable@vger.kernel.org > >Subject: Re: [PATCH] io-mapping: Indicate mapping failure > > > >On Tue, Jul 21, 2020 at 10:16:41AM -0400, Michael J. Ruhl wrote: > >> Sometimes it is good to know when your mapping failed. I was going to say it's always a good idea ;-) > >Can you elaborate... > > Sure, guess I was too glib. 😊 > > Currently the io_mapping_init_wc (the !ATOMIC_IOMAP version), function will > always return success. > > If the setting of the iomem (from ioremap_wc) fails, the only way for the > caller to know is to check the value of iomap->iomem. > > Since all of the callers expect a NULL return on error, and check for a NULL, > I felt this needed a fixes (i.e. unexpected behavior). > > >> Fixes: cafaf14a5d8f ("io-mapping: Always create a struct to hold metadata > >about the io-mapping" > > > >...especially taking into account that Fixes implies regression / bug? > > The failure (in my case a crash) is not revealed until the address is accessed > long after the init. > > I will update the commit. > > Mike > > >-- > >With Best Regards, > >Andy Shevchenko > > > -- Sincerely yours, Mike.