Modify function pci_find_next_cap_ttl to support returning position
of next capability when size "n" is zero.
That can help caller to get next capability offset if caller just
has a information of current capability offset.
That will be used in a follow-on change.
Signed-off-by: Jiqian Chen <jiqian.c...@amd.com>
---
cc: Andrew Cooper <andrew.coop...@citrix.com>
cc: Anthony PERARD <anthony.per...@vates.tech>
cc: Michal Orzel <michal.or...@amd.com>
cc: Jan Beulich <jbeul...@suse.com>
cc: Julien Grall <jul...@xen.org>
cc: "Roger Pau Monné" <roger....@citrix.com>
cc: Stefano Stabellini <sstabell...@kernel.org>
---
v2->v3 changes:
* Only check if n == 0 and add assertion for array "caps".
* Not to change pci_find_next_cap_ttl definition.
v1->v2 changes:
new patch.
Best regards,
Jiqian Chen.
---
xen/drivers/pci/pci.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/xen/drivers/pci/pci.c b/xen/drivers/pci/pci.c
index edf5b9f7ae9f..804f4e1e6066 100644
--- a/xen/drivers/pci/pci.c
+++ b/xen/drivers/pci/pci.c
@@ -55,6 +55,9 @@ unsigned int pci_find_next_cap_ttl(pci_sbdf_t sbdf, unsigned
int pos,
if ( id == 0xff )
break;
+ if ( n == 0 )
+ return pos;
+ ASSERT(caps);
for ( i = 0; i < n; i++ )
{
if ( id == caps[i] )
--
2.34.1
