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Message-ID: <53CF1E02.4000602@linux.vnet.ibm.com> Date: Wed, 23 Jul 2014 10:29:22 +0800 From: Mike Qiu <qiudayu@...ux.vnet.ibm.com> To: Tejun Heo <tj@...nel.org> CC: Jesse Brandeburg <jesse.brandeburg@...il.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, linux-ide@...r.kernel.org, wenxiong@...ux.vnet.ibm.com, brking@...ux.vnet.ibm.com, zhenghch@...ibm.com, haokexin@...il.com Subject: Re: [PATCH 2/2] libata: Fix NULL pointer of scsi_host in ata_port I have tested with the ipr IOA, passed. Reviewed-and Tested-by: Mike Qiu <qiudayu@...ux.vnet.ibm.com> On 07/23/2014 04:11 AM, Tejun Heo wrote: > Hello, > > Can you please test the following patch? > > diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c > index d19c37a7..773f4e6 100644 > --- a/drivers/ata/libata-core.c > +++ b/drivers/ata/libata-core.c > @@ -4798,9 +4798,8 @@ void swap_buf_le16(u16 *buf, unsigned int buf_words) > static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap) > { > struct ata_queued_cmd *qc = NULL; > - unsigned int i, tag, max_queue; > - > - max_queue = ap->scsi_host->can_queue; > + unsigned int max_queue = ap->host->n_tags; > + unsigned int i, tag; > > /* no command while frozen */ > if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) > @@ -6094,6 +6093,7 @@ void ata_host_init(struct ata_host *host, struct device *dev, > { > spin_lock_init(&host->lock); > mutex_init(&host->eh_mutex); > + host->n_tags = ATA_MAX_QUEUE; > host->dev = dev; > host->ops = ops; > } > @@ -6179,11 +6179,7 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht) > * The max queue supported by hardware must not be greater than > * ATA_MAX_QUEUE. > */ > - if (sht->can_queue > ATA_MAX_QUEUE) { > - dev_err(host->dev, "BUG: the hardware max queue is too large\n"); > - WARN_ON(1); > - return -EINVAL; > - } > + host->n_tags = clamp(sht->can_queue, 1, ATA_MAX_QUEUE); > > /* host must have been started */ > if (!(host->flags & ATA_HOST_STARTED)) { > diff --git a/include/linux/libata.h b/include/linux/libata.h > index 5ab4e3a..92abb49 100644 > --- a/include/linux/libata.h > +++ b/include/linux/libata.h > @@ -593,6 +593,7 @@ struct ata_host { > struct device *dev; > void __iomem * const *iomap; > unsigned int n_ports; > + unsigned int n_tags; /* nr of NCQ tags */ > void *private_data; > struct ata_port_operations *ops; > unsigned long flags; > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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