add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/tty/serial/samsung_tty.c
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@@ -1313,8 +1313,12 @@
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 			continue;
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 		rate = clk_get_rate(clk);
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-		if (!rate)
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+		if (!rate) {
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+			dev_err(ourport->port.dev,
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+				"Failed to get clock rate for %s.\n", clkname);
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+			clk_put(clk);
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 			continue;
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+		}
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 		if (ourport->info->has_divslot) {
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 			unsigned long div = rate / req_baud;
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@@ -1340,10 +1344,18 @@
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 			calc_deviation = -calc_deviation;
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 		if (calc_deviation < deviation) {
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+			/*
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+			 * If we find a better clk, release the previous one, if
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+			 * any.
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+			 */
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+			if (!IS_ERR(*best_clk))
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+				clk_put(*best_clk);
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 			*best_clk = clk;
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 			best_quot = quot;
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 			*clk_num = cnt;
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 			deviation = calc_deviation;
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+		} else {
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+			clk_put(clk);
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 		}
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 	}
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