Re: [PATCH v2 08/16] x86/efi: Carrying hibernation key by setup data

[joeyli <jlee@suse.com>]

On Sat, Aug 15, 2015 at 07:07:38PM +0200, Pavel Machek wrote:
> On Tue 2015-08-11 14:16:28, Lee, Chun-Yi wrote:
> > For forwarding hibernation key from EFI stub to boot kernel, this patch
> > allocates setup data for carrying hibernation key, size and the status
> > of efi operating.
> > 
> > Reviewed-by: Jiri Kosina <jkosina@suse.com>
> 
> Jiri, are you sure you reviewed these? This is not really
> english, afaict, and efi/EFI should be spelled consistently.
> 
> Could you try reviewing it again? Pointing out 10s of small
> bugs is quite boring...
>

It's my fault, I will find someone help to review my English in all
patch description for next edition.
 
> >  	unsigned long key_size;
> >  	unsigned long attributes;
> > +	struct setup_data *setup_data, *hibernation_setup_data;
> >  	struct hibernation_keys *keys;
> > +	unsigned long size = 0;
> >  	efi_status_t status;
> >  
> >  	/* Allocate setup_data to carry keys */
> > +	size = sizeof(struct setup_data) + sizeof(struct hibernation_keys);
> >  	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
> > -				sizeof(struct hibernation_keys), &keys);
> > +				size, &hibernation_setup_data);
> >  	if (status != EFI_SUCCESS) {
> >  		efi_printk(sys_table, "Failed to alloc mem for hibernation keys\n");
> >  		return;
> >  	}
> >  
> > -	memset(keys, 0, sizeof(struct hibernation_keys));
> > +	memset(hibernation_setup_data, 0, size);
> > +	keys = (struct hibernation_keys *) hibernation_setup_data->data;
> >  
> 
> any chance to type stuff correctly so that casts are not
> neccessary?
> 

The data element defined in setup_data struct as u8:
        __u8 data[0];

So I use cast here.

> > +clean_fail:
> > +	hibernation_setup_data->type = SETUP_HIBERNATION_KEYS;
> > +	hibernation_setup_data->len = sizeof(struct hibernation_keys);
> > +	hibernation_setup_data->next = 0;
> > +	keys->hkey_status = efi_status_to_err(status);
> > +
> > +	setup_data = (struct setup_data *)params->hdr.setup_data;
> > +	while (setup_data && setup_data->next)
> > +		setup_data = (struct setup_data *)setup_data->next;
> 
> way too many casts here.
> 
> 							Pavel

I follow setup_efi_pci32() and setup_efi_pci64():

        while (data && data->next)
                data = (struct setup_data *)(unsigned long)data->next;

That's better I also add (unsigned long) cast as setup_efi_pci. Do
you have good suggestion let the above code more graceful?


Thanks a lot!
Joey Lee