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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
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@@ -90,6 +90,7 @@
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 			case NVKM_CLK_BOOST_NONE:
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 				if (clk->base_khz && freq > clk->base_khz)
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 					return false;
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+				fallthrough;
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 			case NVKM_CLK_BOOST_BIOS:
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 				if (clk->boost_khz && freq > clk->boost_khz)
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 					return false;
..
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@@ -134,10 +135,10 @@
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 	list_for_each_entry_from_reverse(cstate, &pstate->list, head) {
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 		if (nvkm_cstate_valid(clk, cstate, max_volt, clk->temp))
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-			break;
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+			return cstate;
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 	}
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-	return cstate;
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+	return NULL;
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 }
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 static struct nvkm_cstate *
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@@ -168,6 +169,8 @@
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 	if (!list_empty(&pstate->list)) {
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 		cstate = nvkm_cstate_get(clk, pstate, cstatei);
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 		cstate = nvkm_cstate_find_best(clk, pstate, cstate);
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+		if (!cstate)
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+			return -EINVAL;
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 	} else {
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 		cstate = &pstate->base;
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 	}