add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/clocksource/timer-davinci.c
..
..
@@ -258,21 +258,25 @@
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 				resource_size(&timer_cfg->reg),
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 				"davinci-timer")) {
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 		pr_err("Unable to request memory region\n");
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-		return -EBUSY;
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+		rv = -EBUSY;
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+		goto exit_clk_disable;
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 	}
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 	base = ioremap(timer_cfg->reg.start, resource_size(&timer_cfg->reg));
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 	if (!base) {
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 		pr_err("Unable to map the register range\n");
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-		return -ENOMEM;
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+		rv = -ENOMEM;
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+		goto exit_mem_region;
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 	}
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 	davinci_timer_init(base);
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 	tick_rate = clk_get_rate(clk);
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 	clockevent = kzalloc(sizeof(*clockevent), GFP_KERNEL);
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-	if (!clockevent)
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-		return -ENOMEM;
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+	if (!clockevent) {
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+		rv = -ENOMEM;
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+		goto exit_iounmap_base;
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+	}
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 	clockevent->dev.name = "tim12";
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 	clockevent->dev.features = CLOCK_EVT_FEAT_ONESHOT;
..
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@@ -297,7 +301,7 @@
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 			 "clockevent/tim12", clockevent);
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 	if (rv) {
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 		pr_err("Unable to request the clockevent interrupt\n");
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-		return rv;
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+		goto exit_free_clockevent;
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 	}
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 	davinci_clocksource.dev.rating = 300;
..
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@@ -324,13 +328,27 @@
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 	rv = clocksource_register_hz(&davinci_clocksource.dev, tick_rate);
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 	if (rv) {
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 		pr_err("Unable to register clocksource\n");
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-		return rv;
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+		goto exit_free_irq;
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 	}
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 	sched_clock_register(davinci_timer_read_sched_clock,
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 			     DAVINCI_TIMER_CLKSRC_BITS, tick_rate);
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 	return 0;
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+
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+exit_free_irq:
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+	free_irq(timer_cfg->irq[DAVINCI_TIMER_CLOCKEVENT_IRQ].start,
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+			clockevent);
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+exit_free_clockevent:
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+	kfree(clockevent);
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+exit_iounmap_base:
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+	iounmap(base);
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+exit_mem_region:
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+	release_mem_region(timer_cfg->reg.start,
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+			   resource_size(&timer_cfg->reg));
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+exit_clk_disable:
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+	clk_disable_unprepare(clk);
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+	return rv;
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 }
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 static int __init of_davinci_timer_register(struct device_node *np)