From 38408d056188be29a6c4e17f3703c796551bb330 Mon Sep 17 00:00:00 2001
From: Hartmut Knaack <knaack.h@gmx.de>
Date: Wed, 1 Jan 2014 23:04:00 +0000
Subject: staging:iio:ad799x fix error_free_irq which was freeing an irq that
 may not have been requested

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

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Cc: stable@vger.kernel.org

diff --git a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c
index bad4c8a..c1b601ac 100644
--- a/drivers/staging/iio/adc/ad799x_core.c
+++ b/drivers/staging/iio/adc/ad799x_core.c
@@ -594,7 +594,8 @@ static int ad799x_probe(struct i2c_client *client,
 	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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