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nouveau: fix nv40_perfctr_next() cleanup regression

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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@arndb.de>
Fixes: 8c1aeaa139 ("drm/nouveau/pm: cosmetic changes")
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Arnd Bergmann 2016-03-14 15:24:10 +01:00 committed by Dave Airlie
parent 1a4be38a3a
commit 86d65b7e7a
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c
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@ -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;
}
}