[XenPPC] [pushed] [ppc] update intf->in_cons when reading

[jimix@xxxxxxxxxxxxxx]

changeset:   27808:0163968f7fce161f427479ec6ffed893ed6ee01e
tag:         tip
user:        jimix@xxxxxxxxxxxxxxxxxxxxx
date:        Tue May 16 15:55:19 2006 -0400
files:       arch/powerpc/platforms/xen/udbg_xen.c
description:
[ppc] update intf->in_cons when reading


diff -r 79d69778918c4efd751fb564d2b8c96bcfd74a43 -r 
0163968f7fce161f427479ec6ffed893ed6ee01e arch/powerpc/platforms/xen/udbg_xen.c
--- a/arch/powerpc/platforms/xen/udbg_xen.c     Tue May 16 15:44:25 2006 -0400
+++ b/arch/powerpc/platforms/xen/udbg_xen.c     Tue May 16 15:55:19 2006 -0400
@@ -87,6 +87,7 @@ static int udbg_getc_poll_domu_xen(void)
 static int udbg_getc_poll_domu_xen(void)
 {
        XENCONS_RING_IDX cons, prod;
+       int c;
 
        cons = intf->in_cons;
        prod = intf->in_prod;
@@ -96,7 +97,10 @@ static int udbg_getc_poll_domu_xen(void)
        if (cons == prod)
                return -1;
 
-       return intf->in[MASK_XENCONS_IDX(cons,intf->in)];
+       c = intf->in[MASK_XENCONS_IDX(cons++, intf->in)];
+       wmb();
+       intf->in_cons = cons;
+       return c;
 }
 
 static int udbg_getc_domu_xen(void)



_______________________________________________
Xen-ppc-devel mailing list
Xen-ppc-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ppc-devel