Samuel Thibault
2008-Jun-17 16:54 UTC
[Xen-devel] [PATCH] minios: fix gnttab allocation boundary
minios: fix gnttab allocation boundary
The gnttab_sem is already fed during initialization''s put_free_entry
loop.
Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
diff -r 78f90b0f707f extras/mini-os/gnttab.c
--- a/extras/mini-os/gnttab.c Tue Jun 17 14:45:18 2008 +0100
+++ b/extras/mini-os/gnttab.c Tue Jun 17 17:53:51 2008 +0100
@@ -35,7 +35,7 @@
#ifdef GNT_DEBUG
static char inuse[NR_GRANT_ENTRIES];
#endif
-static __DECLARE_SEMAPHORE_GENERIC(gnttab_sem, NR_GRANT_ENTRIES);
+static __DECLARE_SEMAPHORE_GENERIC(gnttab_sem, 0);
static void
put_free_entry(grant_ref_t ref)
@@ -60,6 +60,7 @@
down(&gnttab_sem);
local_irq_save(flags);
ref = gnttab_list[0];
+ BUG_ON(ref < NR_RESERVED_ENTRIES || ref >= NR_GRANT_ENTRIES);
gnttab_list[0] = gnttab_list[ref];
#ifdef GNT_DEBUG
BUG_ON(inuse[ref]);
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