vfio: Create shared routine for scanning info capabilities

Rather than duplicating the same loop in multiple locations,
create a static function to do the work.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index d41ba67ffbbb68b314d3d4045f22cdc167b72b9e..693d3a29439ac6c24dbe6f0ef9ffffeb73139570 100644 (file)
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1125,17 +1125,12 @@ static void vfio_listener_release(VFIOContainer *container)
     }
 }
 
-struct vfio_info_cap_header *
-vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
+static struct vfio_info_cap_header *
+vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id)
 {
     struct vfio_info_cap_header *hdr;
-    void *ptr = info;
 
-    if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
-        return NULL;
-    }
-
-    for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
+    for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
         if (hdr->id == id) {
             return hdr;
         }
@@ -1144,6 +1139,16 @@ vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
     return NULL;
 }
 
+struct vfio_info_cap_header *
+vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
+{
+    if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
+        return NULL;
+    }
+
+    return vfio_get_cap((void *)info, info->cap_offset, id);
+}
+
 static int vfio_setup_region_sparse_mmaps(VFIORegion *region,
                                           struct vfio_region_info *info)
 {