mfd: fix pcap adc locking

Release the lock on error.

Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/ezx-pcap.c b/drivers/mfd/ezx-pcap.c
index 671a7ef..c1de4af 100644 (file)
--- a/drivers/mfd/ezx-pcap.c
+++ b/drivers/mfd/ezx-pcap.c
@@ -238,8 +238,10 @@ static irqreturn_t pcap_adc_irq(int irq, void *_pcap)
        mutex_lock(&pcap->adc_mutex);
        req = pcap->adc_queue[pcap->adc_head];
 
-       if (WARN(!req, KERN_WARNING "adc irq without pending request\n"))
+       if (WARN(!req, KERN_WARNING "adc irq without pending request\n")) {
+               mutex_unlock(&pcap->adc_mutex);
                return IRQ_HANDLED;
+       }
 
        /* read requested channels results */
        ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);