linux-kernel - [PATCH 1/3] staging: comedi: amplc_dio200_common: prevent extra free

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Message-Id: <1406308029-15712-2-git-send-email-abbotti@mev.co.uk>
Date:	Fri, 25 Jul 2014 18:07:07 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	driverdev-devel@...uxdriverproject.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Abbott <abbotti@....co.uk>,
	H Hartley Sweeten <hartleys@...ionengravers.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] staging: comedi: amplc_dio200_common: prevent extra free_irq()

`dio200_detach()` in "amplc_dio200.c" calls
`amplc_dio200_common_detach()` in "amplc_dio200_common.c", followed by
`comedi_legacy_detach()` in "../drivers.c".  Both of those functions
call `free_irq()` if `dev->irq` is non-zero.  The second call produces a
warning message because the handler has already been freed.  Prevent
that by setting `dev->irq = 0` in `amplc_dio200_common_detach()`.

Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
 drivers/staging/comedi/drivers/amplc_dio200_common.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/comedi/drivers/amplc_dio200_common.c b/drivers/staging/comedi/drivers/amplc_dio200_common.c
index 78700e8..3592e58 100644
--- a/drivers/staging/comedi/drivers/amplc_dio200_common.c
+++ b/drivers/staging/comedi/drivers/amplc_dio200_common.c
@@ -1202,8 +1202,10 @@ void amplc_dio200_common_detach(struct comedi_device *dev)
 
 	if (!thisboard || !devpriv)
 		return;
-	if (dev->irq)
+	if (dev->irq) {
 		free_irq(dev->irq, dev);
+		dev->irq = 0;
+	}
 }
 EXPORT_SYMBOL_GPL(amplc_dio200_common_detach);
 
-- 
2.0.0

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