xen-pciback: short-circuit read path used for merging write values
There's no point calling xen_pcibk_config_read() here - all it'll do is
return whatever conf_space_read() returns for the field which was found
here (and which would be found there again). Also there's no point
clearing tmp_val before the call.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c
index 6a25533..6855bf5 100644
--- a/drivers/xen/xen-pciback/conf_space.c
+++ b/drivers/xen/xen-pciback/conf_space.c
@@ -230,10 +230,8 @@
field_end = OFFSET(cfg_entry) + field->size;
if (req_end > field_start && field_end > req_start) {
- tmp_val = 0;
-
- err = xen_pcibk_config_read(dev, field_start,
- field->size, &tmp_val);
+ err = conf_space_read(dev, cfg_entry, field_start,
+ &tmp_val);
if (err)
break;