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ARM: SAMSUNG: fix race in s3c_adc_start for ADC

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

Signed-off-by: Todd Poynor <toddpoynor@google.com>
Acked-by: Ben Dooks <ben-linux@fluff.org>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Todd Poynor 2012-07-13 15:30:48 +09:00 committed by Kukjin Kim
parent bdd3cc26ba
commit 8265981bb4
1 changed files with 5 additions and 3 deletions
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8
arch/arm/plat-samsung/adc.c
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@ -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;