linux-kernel - [ 045/108] ARM: SAMSUNG: fix race in s3c_adc

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Message-Id: <20120723010658.288545679@decadent.org.uk>
Date:	Mon, 23 Jul 2012 02:07:36 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Todd Poynor <toddpoynor@...gle.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>
Subject: [ 045/108] ARM: SAMSUNG: fix race in s3c_adc_start for ADC

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Todd Poynor <toddpoynor@...gle.com>

commit 8265981bb439f3ecc5356fb877a6c2a6636ac88a upstream.

Checking for adc->ts_pend already claimed should be done with the
lock held.

Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
Acked-by: Ben Dooks <ben-linux@...ff.org>
Signed-off-by: Kukjin Kim <kgene.kim@...sung.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/arm/plat-samsung/adc.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm/plat-samsung/adc.c b/arch/arm/plat-samsung/adc.c
index 33ecd0c..b1e05cc 100644
--- a/arch/arm/plat-samsung/adc.c
+++ b/arch/arm/plat-samsung/adc.c
@@ -157,11 +157,13 @@ int s3c_adc_start(struct s3c_adc_client *client,
 		return -EINVAL;
 	}
 
-	if (client->is_ts && adc->ts_pend)
-		return -EAGAIN;
-
 	spin_lock_irqsave(&adc->lock, flags);
 
+	if (client->is_ts && adc->ts_pend) {
+		spin_unlock_irqrestore(&adc->lock, flags);
+		return -EAGAIN;
+	}
+
 	client->channel = channel;
 	client->nr_samples = nr_samples;
 


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