Mesa (master): i965: Initialize INTEL_DEBUG once per process.

[Matt Turner]

Module: Mesa
Branch: master
Commit: 933c67877678704c2d1a11b46c2703a3f04178ce
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=933c67877678704c2d1a11b46c2703a3f04178ce

Author: Matt Turner <mattst88 at gmail.com>
Date:   Fri Nov 21 18:05:40 2014 -0800

i965: Initialize INTEL_DEBUG once per process.

Reviewed-by: Jason Ekstrand <jason.ekstrand at intel.com>

---

 src/mesa/drivers/dri/i965/intel_debug.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/intel_debug.c b/src/mesa/drivers/dri/i965/intel_debug.c
index a283357..6391cf7 100644
--- a/src/mesa/drivers/dri/i965/intel_debug.c
+++ b/src/mesa/drivers/dri/i965/intel_debug.c
@@ -32,6 +32,7 @@
 #include "brw_context.h"
 #include "intel_debug.h"
 #include "utils.h"
+#include "util/u_atomic.h" /* for p_atomic_cmpxchg */
 
 uint64_t INTEL_DEBUG = 0;
 
@@ -73,7 +74,9 @@ static const struct dri_debug_control debug_control[] = {
 void
 brw_process_intel_debug_variable(struct brw_context *brw)
 {
-   INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
+   uint64_t intel_debug = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
+   (void) p_atomic_cmpxchg(&INTEL_DEBUG, 0, intel_debug);
+
    if (INTEL_DEBUG & DEBUG_BUFMGR)
       dri_bufmgr_set_debug(brw->bufmgr, true);