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SubjectRe: [PATCH 1/1] cciss: resubmit export uid, model, vendor, rev to sysfs
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On Thu, 2009-04-09 at 21:52 -0700, Andrew Morton wrote:
> On Tue, 7 Apr 2009 13:04:11 -0500 "Mike Miller (OS Dev)" <mikem@beardog.cca.cpqcorp.net> wrote:
>
> > Patch 1 of 1 resubmit
> >
> > cciss: add cciss driver sysfs entries
> >
> > This patch adds sysfs entries to the cciss driver needed for the
> > dm/multipath tools. A file for vendor, model, rev, and unique_id are
> > added for each logical drive under directory
> > /sys/bus/pci/devices/<dev>/ccissX/cXdY. Where X = the controller (or
> > host) number and Y is the logical drive number. A link from
> > /sys/bus/pci/devices/<dev>/ccissX/cXdY/block:cciss!cXdY to
> > /sys/block/cciss!cXdY/device is also created.
> >
> > ...
> >
> > +static ssize_t dev_show_model(struct device *dev,
> > + struct device_attribute *attr,
> > + char *buf)
> > +{
> > + drive_info_struct *drv = to_drv(dev);
> > + struct ctlr_info *h = to_hba(drv->dev.parent);
> > + char model[MODEL_LEN + 1];
> > + unsigned long flags;
> > + int ret = 0;
> > +
> > + spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
> > + if (h->busy_configuring)
> > + ret = -EBUSY;
> > + else
> > + memcpy(model, drv->model, MODEL_LEN + 1);
> > + spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
> > +
> > + if (ret)
> > + return ret;
> > + else
> > + return snprintf(buf, MODEL_LEN + 2, "%s\n", drv->model);
>
> Isn't the buffer sizing wrong here? Should be MODEL_LEN+1.
>

Don't we need space for the '\0' and the '\n'?

> > +}
> > +DEVICE_ATTR(model, S_IRUGO, dev_show_model, NULL);
> > +
> > +static ssize_t dev_show_rev(struct device *dev,
> > + struct device_attribute *attr,
> > + char *buf)
> > +{
> > + drive_info_struct *drv = to_drv(dev);
> > + struct ctlr_info *h = to_hba(drv->dev.parent);
> > + char rev[REV_LEN + 1];
> > + unsigned long flags;
> > + int ret = 0;
> > +
> > + spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
> > + if (h->busy_configuring)
> > + ret = -EBUSY;
> > + else
> > + memcpy(rev, drv->rev, REV_LEN + 1);
> > + spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
> > +
> > + if (ret)
> > + return ret;
> > + else
> > + return snprintf(buf, REV_LEN + 2, "%s\n", drv->rev);
>
> Repeated in various places.
>
> > +}




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