[media] fintek-cir: make suspend with active IR more reliable

There was a missing lock in fintek_suspend. Without the lock, its
possible the system will be in the middle of receiving IR (draining the
RX buffer) when we try to disable CIR interrupts.

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/media/rc/fintek-cir.c b/drivers/media/rc/fintek-cir.c
index 8fa539dde1b4..7f7079b12f23 100644
--- a/drivers/media/rc/fintek-cir.c
+++ b/drivers/media/rc/fintek-cir.c
@@ -597,12 +597,17 @@ static void __devexit fintek_remove(struct pnp_dev *pdev)
 static int fintek_suspend(struct pnp_dev *pdev, pm_message_t state)
 {
         struct fintek_dev *fintek = pnp_get_drvdata(pdev);
+        unsigned long flags;
 
         fit_dbg("%s called", __func__);
 
+        spin_lock_irqsave(&fintek->fintek_lock, flags);
+
         /* disable all CIR interrupts */
         fintek_cir_reg_write(fintek, CIR_STATUS_IRQ_MASK, CIR_STATUS);
 
+        spin_unlock_irqrestore(&fintek->fintek_lock, flags);
+
         fintek_config_mode_enable(fintek);
 
         /* disable cir logical dev */