xnu-2782.10.72.tar.gz

[apple/xnu.git] / osfmk / vm / vm_object.c

diff --git a/osfmk/vm/vm_object.c b/osfmk/vm/vm_object.c
index 3658a00a2928248fce2aa3a43fcca212524ad553..e65ac5c15f9fbaf1dabd88de63d09c0fcf478603 100644 (file)
--- a/osfmk/vm/vm_object.c
+++ b/osfmk/vm/vm_object.c
@@ -8704,7 +8704,9 @@ vm_decmp_upl_reprioritize(upl_t upl, int prio)
 
 
        /* First step is just to get the size of the upl to find out how big the reprio info is */
-       upl_lock(upl);
+       if(!upl_try_lock(upl))
+               return;
+
        if (upl->decmp_io_upl == NULL) {
                /* The real I/O upl was destroyed by the time we came in here. Nothing to do. */
                upl_unlock(upl);
@@ -8722,7 +8724,9 @@ vm_decmp_upl_reprioritize(upl_t upl, int prio)
                return;
 
        /* Now again take the lock, recheck the state and grab out the required info */
-       upl_lock(upl);
+       if(!upl_try_lock(upl))
+               goto out;
+
        if (upl->decmp_io_upl == NULL || upl->decmp_io_upl != io_upl) {
                /* The real I/O upl was destroyed by the time we came in here. Nothing to do. */
                upl_unlock(upl);