[PATCH 4.4 30/73] nouveau: fix nv40_perfctr_next() cleanup regression

From: Greg Kroah-Hartman
Date: Wed Sep 28 2016 - 05:07:59 EST

4.4-stable review patch. If anyone has any objections, please let me know.


From: Arnd Bergmann <arnd@xxxxxxxx>

commit 86d65b7e7a0c927d07d18605c276d0f142438ead upstream.

gcc-6 warns about code in the nouveau driver that is obviously silly:

drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c: In function 'nv40_perfctr_next':
drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c:62:19: warning: self-comparison always evaluats to false [-Wtautological-compare]
if (pm->sequence != pm->sequence) {

The behavior was accidentally introduced in a patch described as "This is
purely preparation for upcoming commits, there should be no code changes here.".
As far as I can tell, that was true for the rest of that patch except for
this one function, which has been changed to a NOP.

This patch restores the original behavior.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Fixes: 8c1aeaa13954 ("drm/nouveau/pm: cosmetic changes")
Reviewed-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c
@@ -59,9 +59,11 @@ static void
nv40_perfctr_next(struct nvkm_pm *pm, struct nvkm_perfdom *dom)
struct nvkm_device *device = pm->engine.subdev.device;
- if (pm->sequence != pm->sequence) {
+ struct nv40_pm *nv40pm = container_of(pm, struct nv40_pm, base);
+ if (nv40pm->sequence != pm->sequence) {
nvkm_wr32(device, 0x400084, 0x00000020);
- pm->sequence = pm->sequence;
+ nv40pm->sequence = pm->sequence;