Commit 09238443 authored by Feng Tang's avatar Feng Tang Committed by Greg Kroah-Hartman

serial: mrst_max3110: Check the irq number before enable/disabe irq in PM hooks

We should check the validity of the irq number before calling
disable_irq() and enable_irq() in the suspend/resume function,
as "max->irq == 0" means the irq is not enabled for max3110
device, otherwise it will hurt device whose irq number is really 0.
Signed-off-by: default avatarFeng Tang <feng.tang@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 12082ba2
......@@ -749,6 +749,7 @@ static int serial_m3110_suspend(struct device *dev)
struct spi_device *spi = to_spi_device(dev);
struct uart_max3110 *max = spi_get_drvdata(spi);
if (max->irq > 0)
disable_irq(max->irq);
uart_suspend_port(&serial_m3110_reg, &max->port);
max3110_out(max, max->cur_conf | WC_SW_SHDI);
......@@ -762,6 +763,7 @@ static int serial_m3110_resume(struct device *dev)
max3110_out(max, max->cur_conf);
uart_resume_port(&serial_m3110_reg, &max->port);
if (max->irq > 0)
enable_irq(max->irq);
return 0;
}
......
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