Changeset 29475 in vbox

Timestamp:

May 14, 2010 2:56:49 PM (15 years ago)

Author:

vboxsync

Message:

Solaris/r0drv: fixed double downgrading of a page lock.

File:

• trunk/src/VBox/Runtime/r0drv/solaris/vbi/i86pc/os/vbi.c (modified) (1 diff)

trunk/src/VBox/Runtime/r0drv/solaris/vbi/i86pc/os/vbi.c

@@ -1369 +1369 @@
                 /*
                  * prepare pages for mapping into kernel/user space, we need to
-                 * downgrade the exclusive page lock to a shared lock.
+                 * downgrade the exclusive page lock to a shared lock if the
+                 * pages is locked exclusively.
                  */
-                page_downgrade(pp_pages[i]);
+                if (page_tryupgrade(pp_pages[i]) == 1)
+                page_downgrade(pp_pages[i]);
                 pphysaddrs[i] = vbi_page_to_pa(pp_pages, i);
         }