linux-kernel - [PATCH v5 18/48] soc: fsl: qe: don't use NO_IRQ in qe

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Message-Id: <20191118112324.22725-19-linux@rasmusvillemoes.dk>
Date:   Mon, 18 Nov 2019 12:22:54 +0100
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Christophe Leroy <christophe.leroy@....fr>
Cc:     linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Scott Wood <oss@...error.net>, Timur Tabi <timur@...nel.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH v5 18/48] soc: fsl: qe: don't use NO_IRQ in qe_ic.c

This driver is currently PPC-only, and on powerpc, NO_IRQ is 0, so
this doesn't change functionality. However, not every architecture
defines NO_IRQ, and some define it as -1, so the detection of a failed
irq_of_parse_and_map() (which returns 0 on failure) would be wrong on
those. So to prepare for allowing this driver to build on other
architectures, drop all references to NO_IRQ.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 drivers/soc/fsl/qe/qe_ic.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/soc/fsl/qe/qe_ic.c b/drivers/soc/fsl/qe/qe_ic.c
index 4839dcd5c5d3..8f74bc6efd5c 100644
--- a/drivers/soc/fsl/qe/qe_ic.c
+++ b/drivers/soc/fsl/qe/qe_ic.c
@@ -282,7 +282,7 @@ static const struct irq_domain_ops qe_ic_host_ops = {
 	.xlate = irq_domain_xlate_onetwocell,
 };
 
-/* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
+/* Return an interrupt vector or 0 if no interrupt is pending. */
 unsigned int qe_ic_get_low_irq(struct qe_ic *qe_ic)
 {
 	int irq;
@@ -293,12 +293,12 @@ unsigned int qe_ic_get_low_irq(struct qe_ic *qe_ic)
 	irq = qe_ic_read(qe_ic->regs, QEIC_CIVEC) >> 26;
 
 	if (irq == 0)
-		return NO_IRQ;
+		return 0;
 
 	return irq_linear_revmap(qe_ic->irqhost, irq);
 }
 
-/* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
+/* Return an interrupt vector or 0 if no interrupt is pending. */
 unsigned int qe_ic_get_high_irq(struct qe_ic *qe_ic)
 {
 	int irq;
@@ -309,7 +309,7 @@ unsigned int qe_ic_get_high_irq(struct qe_ic *qe_ic)
 	irq = qe_ic_read(qe_ic->regs, QEIC_CHIVEC) >> 26;
 
 	if (irq == 0)
-		return NO_IRQ;
+		return 0;
 
 	return irq_linear_revmap(qe_ic->irqhost, irq);
 }
@@ -320,7 +320,7 @@ static void qe_ic_cascade_low(struct irq_desc *desc)
 	unsigned int cascade_irq = qe_ic_get_low_irq(qe_ic);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 
-	if (cascade_irq != NO_IRQ)
+	if (cascade_irq != 0)
 		generic_handle_irq(cascade_irq);
 
 	if (chip->irq_eoi)
@@ -333,7 +333,7 @@ static void qe_ic_cascade_high(struct irq_desc *desc)
 	unsigned int cascade_irq = qe_ic_get_high_irq(qe_ic);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 
-	if (cascade_irq != NO_IRQ)
+	if (cascade_irq != 0)
 		generic_handle_irq(cascade_irq);
 
 	if (chip->irq_eoi)
@@ -347,10 +347,10 @@ static void qe_ic_cascade_muxed_mpic(struct irq_desc *desc)
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 
 	cascade_irq = qe_ic_get_high_irq(qe_ic);
-	if (cascade_irq == NO_IRQ)
+	if (cascade_irq == 0)
 		cascade_irq = qe_ic_get_low_irq(qe_ic);
 
-	if (cascade_irq != NO_IRQ)
+	if (cascade_irq != 0)
 		generic_handle_irq(cascade_irq);
 
 	chip->irq_eoi(&desc->irq_data);
@@ -386,7 +386,7 @@ static void __init qe_ic_init(struct device_node *node, unsigned int flags)
 	qe_ic->virq_high = irq_of_parse_and_map(node, 0);
 	qe_ic->virq_low = irq_of_parse_and_map(node, 1);
 
-	if (qe_ic->virq_low == NO_IRQ) {
+	if (!qe_ic->virq_low) {
 		printk(KERN_ERR "Failed to map QE_IC low IRQ\n");
 		kfree(qe_ic);
 		return;
@@ -423,8 +423,7 @@ static void __init qe_ic_init(struct device_node *node, unsigned int flags)
 	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 != NO_IRQ &&
-			qe_ic->virq_high != qe_ic->virq_low) {
+	if (qe_ic->virq_high && qe_ic->virq_high != qe_ic->virq_low) {
 		irq_set_handler_data(qe_ic->virq_high, qe_ic);
 		irq_set_chained_handler(qe_ic->virq_high, high_handler);
 	}
-- 
2.23.0