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

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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);