soc: fsl: qe: fix static checker warning

The patch be7ecbd240b2: "soc: fsl: qe: convert QE interrupt
controller to platform_device" from Aug 3, 2021, leads to the
following static checker warning:

	drivers/soc/fsl/qe/qe_ic.c:438 qe_ic_init()
	warn: unsigned 'qe_ic->virq_low' is never less than zero.

In old variant irq_of_parse_and_map() returns zero if failed so
unsigned int for virq_high/virq_low was ok.
In new variant platform_get_irq() returns negative error codes
if failed so we need to use int for virq_high/virq_low.

Also simplify high_handler checking and remove the curly braces
to make checkpatch happy.

Fixes: be7ecbd240b2 ("soc: fsl: qe: convert QE interrupt controller to platform_device")
Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>

diff --git a/drivers/soc/fsl/qe/qe_ic.c b/drivers/soc/fsl/qe/qe_ic.c
index e710d55..bbae3d3 100644 (file)
--- a/drivers/soc/fsl/qe/qe_ic.c
+++ b/drivers/soc/fsl/qe/qe_ic.c
@@ -54,8 +54,8 @@ struct qe_ic {
        struct irq_chip hc_irq;
 
        /* VIRQ numbers of QE high/low irqs */
-       unsigned int virq_high;
-       unsigned int virq_low;
+       int virq_high;
+       int virq_low;
 };
 
 /*
@@ -435,11 +435,10 @@ static int qe_ic_init(struct platform_device *pdev)
        qe_ic->virq_high = platform_get_irq(pdev, 0);
        qe_ic->virq_low = platform_get_irq(pdev, 1);
 
-       if (qe_ic->virq_low < 0) {
+       if (qe_ic->virq_low <= 0)
                return -ENODEV;
-       }
 
-       if (qe_ic->virq_high != qe_ic->virq_low) {
+       if (qe_ic->virq_high > 0 && qe_ic->virq_high != qe_ic->virq_low) {
                low_handler = qe_ic_cascade_low;
                high_handler = qe_ic_cascade_high;
        } else {
@@ -459,7 +458,7 @@ static int qe_ic_init(struct platform_device *pdev)
        irq_set_handler_data(qe_ic->virq_low, qe_ic);
        irq_set_chained_handler(qe_ic->virq_low, low_handler);
 
-       if (qe_ic->virq_high && qe_ic->virq_high != qe_ic->virq_low) {
+       if (high_handler) {
                irq_set_handler_data(qe_ic->virq_high, qe_ic);
                irq_set_chained_handler(qe_ic->virq_high, high_handler);
        }