[ 05/23] ARM: SAMSUNG: fix race in s3c_adc_start for ADC

[Greg Kroah-Hartman]

From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>

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

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

From: Todd Poynor <toddpoynor@xxxxxxxxxx>

commit 8265981bb439f3ecc5356fb877a6c2a6636ac88a upstream.

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

Signed-off-by: Todd Poynor <toddpoynor@xxxxxxxxxx>
Acked-by: Ben Dooks <ben-linux@xxxxxxxxx>
Signed-off-by: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/arm/plat-samsung/adc.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/arch/arm/plat-samsung/adc.c
+++ b/arch/arm/plat-samsung/adc.c
@@ -143,11 +143,13 @@ int s3c_adc_start(struct s3c_adc_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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