X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=ipc%2Fsem.c;h=46bb8a678decb50f760193c94cf2dcbce9f0e4e8;hb=5d870c8e216f121307445c71caa72e7e10a20061;hp=19af028a3e380d251d31e4b8ec4cd96ee679a1cb;hpb=c324b44c34050cf2a9b58830e11c974806bd85d8;p=firefly-linux-kernel-4.4.55.git

diff --git a/ipc/sem.c b/ipc/sem.c
index 19af028a3e38..46bb8a678dec 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -73,6 +73,7 @@
 #include <linux/security.h>
 #include <linux/syscalls.h>
 #include <linux/audit.h>
+#include <linux/capability.h>
 #include <linux/seq_file.h>
 #include <asm/uaccess.h>
 #include "util.h"
@@ -381,6 +382,7 @@ static void update_queue (struct sem_array * sma)
 			/* hands-off: q will disappear immediately after
 			 * writing q->status.
 			 */
+			smp_wmb();
 			q->status = error;
 			q = n;
 		} else {
@@ -461,6 +463,7 @@ static void freeary (struct sem_array *sma, int id)
 		n = q->next;
 		q->status = IN_WAKEUP;
 		wake_up_process(q->sleeper); /* doesn't sleep */
+		smp_wmb();
 		q->status = -EIDRM;	/* hands-off q */
 		q = n;
 	}