add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/block/blk-mq-sysfs.c
..
..
@@ -242,7 +242,7 @@
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 {
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 	struct request_queue *q = hctx->queue;
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 	struct blk_mq_ctx *ctx;
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-	int i, ret;
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+	int i, j, ret;
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 	if (!hctx->nr_ctx)
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 		return 0;
..
..
@@ -254,9 +254,16 @@
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 	hctx_for_each_ctx(hctx, ctx, i) {
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 		ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
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 		if (ret)
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-			break;
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+			goto out;
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 	}
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+	return 0;
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+out:
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+	hctx_for_each_ctx(hctx, ctx, j) {
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+		if (j < i)
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+			kobject_del(&ctx->kobj);
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+	}
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+	kobject_del(&hctx->kobj);
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 	return ret;
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 }
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