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-rw-r--r--kernel/marker.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/kernel/marker.c b/kernel/marker.c
index 971da53..7d1faec 100644
--- a/kernel/marker.c
+++ b/kernel/marker.c
@@ -126,6 +126,11 @@ void marker_probe_cb(const struct marker *mdata, void *call_private, ...)
struct marker_probe_closure *multi;
int i;
/*
+ * Read mdata->ptype before mdata->multi.
+ */
+ smp_rmb();
+ multi = mdata->multi;
+ /*
* multi points to an array, therefore accessing the array
* depends on reading multi. However, even in this case,
* we must insure that the pointer is read _before_ the array
@@ -133,7 +138,6 @@ void marker_probe_cb(const struct marker *mdata, void *call_private, ...)
* in the fast path, so put the explicit barrier here.
*/
smp_read_barrier_depends();
- multi = mdata->multi;
for (i = 0; multi[i].func; i++) {
va_start(args, call_private);
multi[i].func(multi[i].probe_private, call_private,
@@ -175,6 +179,11 @@ void marker_probe_cb_noarg(const struct marker *mdata, void *call_private, ...)
struct marker_probe_closure *multi;
int i;
/*
+ * Read mdata->ptype before mdata->multi.
+ */
+ smp_rmb();
+ multi = mdata->multi;
+ /*
* multi points to an array, therefore accessing the array
* depends on reading multi. However, even in this case,
* we must insure that the pointer is read _before_ the array
@@ -182,7 +191,6 @@ void marker_probe_cb_noarg(const struct marker *mdata, void *call_private, ...)
* in the fast path, so put the explicit barrier here.
*/
smp_read_barrier_depends();
- multi = mdata->multi;
for (i = 0; multi[i].func; i++)
multi[i].func(multi[i].probe_private, call_private,
mdata->format, &args);
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