linux-kernel - [PATCH] soc: fsl: qe: fix static checker warning

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Date:   Wed, 11 Aug 2021 10:10:36 +0300
From:   Maxim Kochetkov <fido_max@...ox.ru>
To:     Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...ox.ru>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/soc/fsl/qe/qe_ic.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/soc/fsl/qe/qe_ic.c b/drivers/soc/fsl/qe/qe_ic.c
index e710d554425d..bff34ee2150a 100644
--- 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;
 };
 
 /*
@@ -435,9 +435,8 @@ 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) {
 		low_handler = qe_ic_cascade_low;
@@ -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);
 	}
-- 
2.31.1