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Re: [PATCH v2 1/8] driver/pci: Get next capability without passing caps
- To: Jiqian Chen <Jiqian.Chen@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 10 Apr 2025 14:34:37 +0200
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- Cc: Huang Rui <ray.huang@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 10 Apr 2025 12:35:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 09.04.2025 08:45, Jiqian Chen wrote:
> --- a/xen/drivers/pci/pci.c
> +++ b/xen/drivers/pci/pci.c
> @@ -40,7 +40,7 @@ unsigned int pci_find_cap_offset(pci_sbdf_t sbdf, unsigned
> int cap)
> }
>
> unsigned int pci_find_next_cap_ttl(pci_sbdf_t sbdf, unsigned int pos,
> - const unsigned int caps[], unsigned int n,
> + const unsigned int *caps, unsigned int n,
I don't follow the need for this change.
> @@ -55,6 +55,10 @@ unsigned int pci_find_next_cap_ttl(pci_sbdf_t sbdf,
> unsigned int pos,
>
> if ( id == 0xff )
> break;
> +
> + if ( !caps || n == 0 )
> + return pos;
Checking n to be zero ought to suffice here? In that case it doesn't matter
what caps is. Plus if n is non-zero, it clearly is an error if caps was NULL.
Jan
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