Re: [PATCH] PCI: hv: Use struct_size() helper

[Wei Liu]

On Mon, May 25, 2020 at 11:43:19AM -0500, Gustavo A. R. Silva wrote:
> One of the more common cases of allocation size calculations is finding
> the size of a structure that has a zero-sized array at the end, along
> with memory for some number of elements for that array. For example:
> 
> struct hv_dr_state {
> 	...
>         struct hv_pcidev_description func[];
> };
> 
> struct pci_bus_relations {
> 	...
>         struct pci_function_description func[];
> } __packed;
> 
> Make use of the struct_size() helper instead of an open-coded version
> in order to avoid any potential type mistakes.
> 
> So, replace the following forms:
> 
> offsetof(struct hv_dr_state, func) +
> 	(sizeof(struct hv_pcidev_description) *
> 	(relations->device_count))
> 
> offsetof(struct pci_bus_relations, func) +
> 	(sizeof(struct pci_function_description) *
> 	(bus_rel->device_count))
> 
> with:
> 
> struct_size(dr, func, relations->device_count)
> 
> and
> 
> struct_size(bus_rel, func, bus_rel->device_count)
> 
> respectively.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>

Reviewed-by: Wei Liu <wei.liu@xxxxxxxxxx>

FAOD I expect this patch to go through pci tree.