linux-kernel - [PATCH 6.0 487/862] tty: xilinx_uartps: Check clk

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Message-Id: <20221019083311.500145609@linuxfoundation.org>
Date:   Wed, 19 Oct 2022 10:29:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 487/862] tty: xilinx_uartps: Check clk_enable return value

From: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>

[ Upstream commit 957e8c047bf25bd24271ab049f06dc47f382973f ]

If clocks are not enabled the register access may hang the system.
Check for the clock enable return value and bail out if not enabled.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
Link: https://lore.kernel.org/r/20220729114748.18332-2-shubhrajyoti.datta@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Stable-dep-of: b8a6c3b3d465 ("tty: xilinx_uartps: Fix the ignore_status")
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/tty/serial/xilinx_uartps.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 9e01fe6c0ab8..51fd09e14eda 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1329,12 +1329,20 @@ static int cdns_uart_resume(struct device *device)
 	unsigned long flags;
 	u32 ctrl_reg;
 	int may_wake;
+	int ret;
 
 	may_wake = device_may_wakeup(device);
 
 	if (console_suspend_enabled && uart_console(port) && !may_wake) {
-		clk_enable(cdns_uart->pclk);
-		clk_enable(cdns_uart->uartclk);
+		ret = clk_enable(cdns_uart->pclk);
+		if (ret)
+			return ret;
+
+		ret = clk_enable(cdns_uart->uartclk);
+		if (ret) {
+			clk_disable(cdns_uart->pclk);
+			return ret;
+		}
 
 		spin_lock_irqsave(&port->lock, flags);
 
-- 
2.35.1