On Tue, Apr 28, 2009 at 08:14:13AM -0700, Yinghai Lu wrote:
> Greg KH wrote:
> > On Tue, Apr 28, 2009 at 12:36:06AM -0700, Yinghai Lu wrote:
> >> while looking dev_set_name() calling, there is one
> >> dev_set_name(&dev->dev, NULL)
> >> to used to try to free the device name, before kfree that device.
> >
> > What's wrong with that?
> >
> >> need to move the check for device_add in
> >> | commit 8a577ffc75d9194fe8cdb7479236f2081c26ca1f
> >> | Author: Kay Sievers <kay.sievers@xxxxxxxx>
> >> | Date: Sat Apr 18 15:05:45 2009 -0700
> >> |
> >> | driver: dont update dev_name via device_add path
> >> from kobject_set_name_vargs to kobject_add_vargs instead.
> >>
> >> in kobject_set_name_vargs will check if fmt is NULL.
> >>
> >> actually we need to use dev_set_name(,NULL) later on failing path
> >> and release to prevent leaking
> >
> > Are you sure?
> >
> > confused,
> >
>
> in arch/arm/common/sa111.c
>
>
> static int
> sa1111_init_one_child(struct sa1111 *sachip, struct resource *parent,
> struct sa1111_dev_info *info)
> {
> struct sa1111_dev *dev;
> int ret;
>
> dev = kzalloc(sizeof(struct sa1111_dev), GFP_KERNEL);
> if (!dev) {
> ret = -ENOMEM;
> goto out;
> }
>
> dev_set_name(&dev->dev, "%4.4lx", info->offset);
> dev->devid = info->devid;
> dev->dev.parent = sachip->dev;
> dev->dev.bus = &sa1111_bus_type;
> dev->dev.release = sa1111_dev_release;
> dev->dev.coherent_dma_mask = sachip->dev->coherent_dma_mask;
> dev->res.start = sachip->phys + info->offset;
> dev->res.end = dev->res.start + 511;
> dev->res.name = dev_name(&dev->dev);
> dev->res.flags = IORESOURCE_MEM;
> dev->mapbase = sachip->base + info->offset;
> dev->skpcr_mask = info->skpcr_mask;
> memmove(dev->irq, info->irq, sizeof(dev->irq));
>
> ret = request_resource(parent, &dev->res);
> if (ret) {
> printk("SA1111: failed to allocate resource for %s\n",
> dev->res.name);
> dev_set_name(&dev->dev, NULL);
> kfree(dev);
> goto out;
> }
>
>
> when first dev_set_name is called, dev->dev.kobj.name will initialized from kmalloc.
> so before kfree(dev), do we need to kfree that name?
Do a "put_device()" instead, and everything will be freed.
thanks,
greg k-h
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
