From: Frank Mori Hess <fmhess@speakeasy.net>
Date: Fri, 21 Mar 2008 18:48:51 +0000 (+0000)
Subject: ... and check that ai_mite_chan is not NULL after we have spinlock.
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=f66a4ad74a1b5c41f44b2531545cdcd419c1cdc8;p=comedi.git

... and check that ai_mite_chan is not NULL after we have spinlock.
---

diff --git a/comedi/drivers/ni_mio_common.c b/comedi/drivers/ni_mio_common.c
index bd69df47..9718703e 100644
--- a/comedi/drivers/ni_mio_common.c
+++ b/comedi/drivers/ni_mio_common.c
@@ -1554,6 +1554,12 @@ static int ni_ai_setup_MITE_dma(comedi_device * dev)
 
 
 	comedi_spin_lock_irqsave(&devpriv->mite_channel_lock, flags);
+	if(devpriv->ai_mite_chan == NULL)
+	{
+		comedi_spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
+		return -EIO;
+	}
+
 	switch (boardtype.reg_type) {
 	case ni_reg_611x:
 	case ni_reg_6143: