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drm/nouveau/gr/gk104-: prevent reading non-existent regs in intr handler 

Under certain circumstances the trapped address will contain subc 7,
which GK104 GR doesn't have anymore.

Notice this case to avoid causing additional priv ring faults.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2015-04-13 13:09:28 +10:00
parent ddec1a2b4c
commit 91c772ec12
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c
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@ -1097,9 +1097,14 @@ gf100_gr_intr(struct nvkm_subdev *subdev)
u32 subc = (addr & 0x00070000) >> 16;
u32 data = nv_rd32(priv, 0x400708);
u32 code = nv_rd32(priv, 0x400110);
u32 class = nv_rd32(priv, 0x404200 + (subc * 4));
u32 class;
int chid;
if (nv_device(priv)->card_type < NV_E0 || subc < 4)
class = nv_rd32(priv, 0x404200 + (subc * 4));
else
class = 0x0000;
engctx = nvkm_engctx_get(engine, inst);
chid = pfifo->chid(pfifo, engctx);