linux-kernel - [PATCH] usb/isp1760: set IRQ flags properly

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Message-Id: <1425043780-21773-1-git-send-email-Valentin.Rothberg@lip6.fr>
Date:	Fri, 27 Feb 2015 14:29:40 +0100
From:	Valentin Rothberg <Valentin.Rothberg@...6.fr>
To:	gregkh@...uxfoundation.org, balbi@...com,
	laurent.pinchart@...asonboard.com, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Cc:	Valentin Rothberg <Valentin.Rothberg@...6.fr>
Subject: [PATCH] usb/isp1760: set IRQ flags properly

The IRQF_DISABLED is a NOOP and scheduled to be removed.  According to
commit e58aa3d2d0cc (genirq: Run irq handlers with interrupts disabled)
running IRQ handlers with interrupts enabled can cause stack overflows
when the interrupt line of the issuing device is still active.

This patch removes using this deprecated flag and additionally removes
redundantly setting IRQF_SHARED.

Signed-off-by: Valentin Rothberg <Valentin.Rothberg@...6.fr>
---
 drivers/usb/isp1760/isp1760-core.c | 5 ++---
 drivers/usb/isp1760/isp1760-udc.c  | 4 ++--
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/isp1760/isp1760-core.c b/drivers/usb/isp1760/isp1760-core.c
index b982755..9f4a0de 100644
--- a/drivers/usb/isp1760/isp1760-core.c
+++ b/drivers/usb/isp1760/isp1760-core.c
@@ -145,14 +145,13 @@ int isp1760_register(struct resource *mem, int irq, unsigned long irqflags,
 
 	if (IS_ENABLED(CONFIG_USB_ISP1760_HCD) && !usb_disabled()) {
 		ret = isp1760_hcd_register(&isp->hcd, isp->regs, mem, irq,
-					   irqflags | IRQF_SHARED, dev);
+					   irqflags, dev);
 		if (ret < 0)
 			return ret;
 	}
 
 	if (IS_ENABLED(CONFIG_USB_ISP1761_UDC) && !udc_disabled) {
-		ret = isp1760_udc_register(isp, irq, irqflags | IRQF_SHARED |
-					   IRQF_DISABLED);
+		ret = isp1760_udc_register(isp, irq, irqflags);
 		if (ret < 0) {
 			isp1760_hcd_unregister(&isp->hcd);
 			return ret;
diff --git a/drivers/usb/isp1760/isp1760-udc.c b/drivers/usb/isp1760/isp1760-udc.c
index 9612d79..0b46ff0 100644
--- a/drivers/usb/isp1760/isp1760-udc.c
+++ b/drivers/usb/isp1760/isp1760-udc.c
@@ -1451,8 +1451,8 @@ int isp1760_udc_register(struct isp1760_device *isp, int irq,
 
 	sprintf(udc->irqname, "%s (udc)", devname);
 
-	ret = request_irq(irq, isp1760_udc_irq, IRQF_SHARED | IRQF_DISABLED |
-			  irqflags, udc->irqname, udc);
+	ret = request_irq(irq, isp1760_udc_irq, IRQF_SHARED | irqflags,
+			  udc->irqname, udc);
 	if (ret < 0)
 		goto error;
 
-- 
1.9.1

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