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tty: xilinx_uartps: Check clk_enable return value

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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@xilinx.com>
Link: https://lore.kernel.org/r/20220729114748.18332-2-shubhrajyoti.datta@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shubhrajyoti Datta
2022-07-29 17:17:42 +05:30
committed by Greg Kroah-Hartman
parent 568035b01c
commit 957e8c047b
1 changed files with 10 additions and 2 deletions
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12
drivers/tty/serial/xilinx_uartps.c
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@@ -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);