linux-kernel - [PATCH v2 12/18] sh: replace setup_irq() by request

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Date:   Mon, 24 Feb 2020 06:21:56 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v2 12/18] sh: replace setup_irq() by request_irq()

request_irq() is preferred over setup_irq(). The early boot setup_irq()
invocations happen either via 'init_IRQ()' or 'time_init()', while
memory allocators are ready by 'mm_init()'.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

Seldom remove_irq() usage has been observed coupled with setup_irq(),
wherever that has been found, it too has been replaced by free_irq().

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com>
---

v2:
 * Replace pr_err("request_irq() on %s failed" by
           pr_err("%s: request_irq() failed"
 * Commit message massage

 arch/sh/boards/mach-cayman/irq.c | 18 ++++++------------
 arch/sh/drivers/dma/dma-pvr2.c   |  9 +++------
 2 files changed, 9 insertions(+), 18 deletions(-)

diff --git a/arch/sh/boards/mach-cayman/irq.c b/arch/sh/boards/mach-cayman/irq.c
index 3b6ea2d99013..57d015f3c075 100644
--- a/arch/sh/boards/mach-cayman/irq.c
+++ b/arch/sh/boards/mach-cayman/irq.c
@@ -40,16 +40,6 @@ static irqreturn_t cayman_interrupt_pci2(int irq, void *dev_id)
 	return IRQ_NONE;
 }
 
-static struct irqaction cayman_action_smsc = {
-	.name		= "Cayman SMSC Mux",
-	.handler	= cayman_interrupt_smsc,
-};
-
-static struct irqaction cayman_action_pci2 = {
-	.name		= "Cayman PCI2 Mux",
-	.handler	= cayman_interrupt_pci2,
-};
-
 static void enable_cayman_irq(struct irq_data *data)
 {
 	unsigned int irq = data->irq;
@@ -149,6 +139,10 @@ void init_cayman_irq(void)
 	}
 
 	/* Setup the SMSC interrupt */
-	setup_irq(SMSC_IRQ, &cayman_action_smsc);
-	setup_irq(PCI2_IRQ, &cayman_action_pci2);
+	if (request_irq(SMSC_IRQ, cayman_interrupt_smsc, 0, "Cayman SMSC Mux",
+			NULL))
+		pr_err("%s: request_irq() failed\n", "Cayman SMSC Mux");
+	if (request_irq(PCI2_IRQ, cayman_interrupt_pci2, 0, "Cayman PCI2 Mux",
+			NULL))
+		pr_err("%s: request_irq() failed\n", "Cayman PCI2 Mux");
 }
diff --git a/arch/sh/drivers/dma/dma-pvr2.c b/arch/sh/drivers/dma/dma-pvr2.c
index b5dbd1f75768..0e5aa558a5f2 100644
--- a/arch/sh/drivers/dma/dma-pvr2.c
+++ b/arch/sh/drivers/dma/dma-pvr2.c
@@ -64,11 +64,6 @@ static int pvr2_xfer_dma(struct dma_channel *chan)
 	return 0;
 }
 
-static struct irqaction pvr2_dma_irq = {
-	.name		= "pvr2 DMA handler",
-	.handler	= pvr2_dma_interrupt,
-};
-
 static struct dma_ops pvr2_dma_ops = {
 	.request	= pvr2_request_dma,
 	.get_residue	= pvr2_get_dma_residue,
@@ -84,7 +79,9 @@ static struct dma_info pvr2_dma_info = {
 
 static int __init pvr2_dma_init(void)
 {
-	setup_irq(HW_EVENT_PVR2_DMA, &pvr2_dma_irq);
+	if (request_irq(HW_EVENT_PVR2_DMA, pvr2_dma_interrupt, 0,
+			"pvr2 DMA handler", NULL))
+		pr_err("%s: request_irq() failed\n", "pvr2 DMA handler");
 	request_dma(PVR2_CASCADE_CHAN, "pvr2 cascade");
 
 	return register_dmac(&pvr2_dma_info);
-- 
2.25.1