linux-kernel - [PATCH 08/19] Fixed missing spin lock on pipeline process

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Date:	Tue, 19 May 2009 15:58:28 +0200
From:	Karsten Keil <keil@...systems.de>
To:	linux-kernel@...r.kernel.org
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	i4ldeveloper@...tserv.isdn4linux.de
Subject: [PATCH 08/19] Fixed missing spin lock on pipeline process

From: Andreas Eversberg <andreas@...rsberg.eu>

Need to protect the complete pipeline.

Signed-off-by: Andreas Eversberg <andreas@...rsberg.eu>
Signed-off-by: Karsten Keil <keil@...systems.de>
---
 drivers/isdn/mISDN/dsp_core.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/isdn/mISDN/dsp_core.c b/drivers/isdn/mISDN/dsp_core.c
index e4ddd80..d3184a0 100644
--- a/drivers/isdn/mISDN/dsp_core.c
+++ b/drivers/isdn/mISDN/dsp_core.c
@@ -704,6 +704,8 @@ dsp_function(struct mISDNchannel *ch,  struct sk_buff *skb)
 			break;
 		}
 
+		spin_lock_irqsave(&dsp_lock, flags);
+
 		/* decrypt if enabled */
 		if (dsp->bf_enable)
 			dsp_bf_decrypt(dsp, skb->data, skb->len);
@@ -741,11 +743,11 @@ dsp_function(struct mISDNchannel *ch,  struct sk_buff *skb)
 			}
 		}
 		/* we need to process receive data if software */
-		spin_lock_irqsave(&dsp_lock, flags);
 		if (dsp->pcm_slot_tx < 0 && dsp->pcm_slot_rx < 0) {
 			/* process data from card at cmx */
 			dsp_cmx_receive(dsp, skb);
 		}
+
 		spin_unlock_irqrestore(&dsp_lock, flags);
 
 		if (dsp->rx_disabled) {
-- 
1.6.0.2

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