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

Message ID 1306527414-19015-1-git-send-email-jarod@redhat.com (mailing list archive)
State Accepted
Headers show

Commit Message

Jarod Wilson May 27, 2011, 8:16 p.m. UTC 
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>
---
 drivers/media/rc/fintek-cir.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
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Patch

diff --git a/drivers/media/rc/fintek-cir.c b/drivers/media/rc/fintek-cir.c
index 8fa539d..7f7079b 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 */