linux-kernel - [PATCH 3.2 032/200] staging:iio:ad799x fix error_free_irq which was freeing an irq that may not have been requested

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Date:	Mon, 31 Mar 2014 00:23:35 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Hartmut Knaack" <knaack.h@....de>,
	"Lars-Peter Clausen" <lars@...afoo.de>,
	"Jonathan Cameron" <jic23@...nel.org>
Subject: [PATCH 3.2 032/200] staging:iio:ad799x fix error_free_irq which
 was freeing an irq that may not have been requested

3.2.56-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Hartmut Knaack <knaack.h@....de>

commit 38408d056188be29a6c4e17f3703c796551bb330 upstream.

Only free an IRQ in error_free_irq, if it has been requested previously.

Signed-off-by: Hartmut Knaack <knaack.h@....de>
Acked-by: Lars-Peter Clausen <lars@...afoo.de>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/staging/iio/adc/ad799x_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/staging/iio/adc/ad799x_core.c
+++ b/drivers/staging/iio/adc/ad799x_core.c
@@ -873,7 +873,8 @@ static int __devinit ad799x_probe(struct
 	return 0;
 
 error_free_irq:
-	free_irq(client->irq, indio_dev);
+	if (client->irq > 0)
+		free_irq(client->irq, indio_dev);
 error_cleanup_ring:
 	ad799x_ring_cleanup(indio_dev);
 error_disable_reg:

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