linux-kernel - [PATCH 5.13 055/127] soc: fsl: qe: fix static checker warning

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Date:   Tue, 24 Aug 2021 12:54:55 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Maxim Kochetkov <fido_max@...ox.ru>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Li Yang <leoyang.li@....com>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 055/127] soc: fsl: qe: fix static checker warning

From: Maxim Kochetkov <fido_max@...ox.ru>

[ Upstream commit c1e64c0aec8cb0499e61af7ea086b59abba97945 ]

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>
Signed-off-by: Li Yang <leoyang.li@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/soc/fsl/qe/qe_ic.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/fsl/qe/qe_ic.c b/drivers/soc/fsl/qe/qe_ic.c
index e710d554425d..bbae3d39c7be 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;
 };
 
 /*
@@ -435,11 +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);
 	}
-- 
2.30.2