linux-kernel - [PATCH] uio: don't free irq that was not requested

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Message-ID: <20150514091913.46cd2b94@urahara>
Date:	Thu, 14 May 2015 09:19:13 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	"Hans J. Koch" <hjk@...sjkoch.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] uio: don't free irq that was not requested

UIO base driver should only free_irq that it has requested.
UIO supports drivers without interrupts (irq == 0) or custom handlers.

This fixes warnings like:

WARNING: CPU: 1 PID: 5478 at kernel/irq/manage.c:1244 __free_irq+0xa9/0x1e0()
Trying to free already-free IRQ 0

Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>

--- a/drivers/uio/uio.c	2015-05-14 09:04:54.677283462 -0700
+++ b/drivers/uio/uio.c	2015-05-14 09:09:28.170547587 -0700
@@ -879,7 +879,8 @@ void uio_unregister_device(struct uio_in
 
 	uio_dev_del_attributes(idev);
 
-	free_irq(idev->info->irq, idev);
+	if (info->irq && info->irq != UIO_IRQ_CUSTOM)
+		free_irq(info->irq, idev);
 
 	device_destroy(&uio_class, MKDEV(uio_major, idev->minor));
 

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