From: Jiqian Chen <Jiqian.Chen@amd.com>
Date: Wed, 23 Apr 2025 07:42:08 +0000 (+0200)
Subject: drivers/pci: Get next capability without passing caps
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=fcc44f8548b89a649003c4348702e04e0c20b205;p=xen.git

drivers/pci: Get next capability without passing caps

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.Chen@amd.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---

diff --git a/xen/drivers/pci/pci.c b/xen/drivers/pci/pci.c
index edf5b9f7ae..acf4cebe42 100644
--- a/xen/drivers/pci/pci.c
+++ b/xen/drivers/pci/pci.c
@@ -55,6 +55,11 @@ unsigned int pci_find_next_cap_ttl(pci_sbdf_t sbdf, unsigned int pos,
 
         if ( id == 0xff )
             break;
+
+        if ( !n )
+            return pos;
+        ASSERT(caps);
+
         for ( i = 0; i < n; i++ )
         {
             if ( id == caps[i] )