Re: [Patch] Fix oops on rmmod usb-storage

[Matthew Wilcox]

On Wed, Sep 29, 2004 at 11:15:13AM -0400, James Bottomley wrote:
>  struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, int gfp_mask)
>  {
> -	struct scsi_cmnd *cmd = __scsi_get_command(dev->host, gfp_mask);
> +	struct scsi_cmnd *cmd;
> +
> +	/* Bail if we can't get a reference to the device */
> +	if (!get_device(&dev->sdev_gendev))
> +		return NULL;

How can this happen?  You're taking the address of dev->sdev_gendev, so it
can't be NULL:

struct device * get_device(struct device * dev)
{
        return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
}

(kobject_get returns its argument).

-- 
"Next the statesmen will invent cheap lies, putting the blame upon 
the nation that is attacked, and every man will be glad of those
conscience-soothing falsities, and will diligently study them, and refuse
to examine any refutations of them; and thus he will by and by convince 
himself that the war is just, and will thank God for the better sleep 
he enjoys after this process of grotesque self-deception." -- Mark Twain
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