From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Qiu Subject: Re: [PATCH 2/2] libata: Fix NULL pointer of scsi_host in ata_port Date: Wed, 23 Jul 2014 10:37:35 +0800 Message-ID: <53CF1FEF.7050704@linux.vnet.ibm.com> References: <1406040688-1762-1-git-send-email-qiudayu@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1406040688-1762-1-git-send-email-qiudayu@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org To: Mike Qiu Cc: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, tj@kernel.org, haokexin@gmail.com List-Id: linux-ide@vger.kernel.org On 07/22/2014 10:51 PM, Mike Qiu wrote: > In ata_sas_port_alloc(), it haven't initialized scsi_host field in > ata_port, although scsi_host is in parameters list and unused in this > function. > > With commit 1871ee134b73 ("libata: support the ata host which implements a queue depth less than 32") > ata_qc_new() try to use scsi_host, while it > is a NULL pointer for ipr IOA and error message shows below: ... > > While scsi_host is unused in ata_sas_port_alloc(), better to set it > in ata_sas_port_alloc() instead of in driver. > > Signed-off-by: Mike Qiu > --- > drivers/ata/libata-scsi.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c > index 0586f66..a472b6f 100644 > --- a/drivers/ata/libata-scsi.c > +++ b/drivers/ata/libata-scsi.c > @@ -4070,6 +4070,7 @@ struct ata_port *ata_sas_port_alloc(struct ata_host *host, > ap->flags |= port_info->flags; > ap->ops = port_info->port_ops; > ap->cbl = ATA_CBL_SATA; > + ap->scsi_host = shost; What about my patch itself, ata_sas_port_alloc() has "shot" in parameters list, but unused. Maybe better to set ap->scsi_host here, it is very convenient, and drivers, like ipr, may forget to set this field, otherwise "shot" need to be removed from parameters list I think. Thanks, Mike > return ap; > }