linux-kernel - [PATCH] OSS: mpu401, fix deadlock

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Date:	Mon, 29 Jun 2009 18:03:34 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	tiwai@...e.de
Cc:	perex@...ex.cz, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Jiri Slaby <jirislaby@...il.com>
Subject: [PATCH] OSS: mpu401, fix deadlock

If somebody cares about oss at all.
--
mpu401_chk_version is called with a spin lock already held. Don't take it
again.

Signed-off-by: Jiri Slaby <jirislaby@...il.com>
---
 sound/oss/mpu401.c |   16 +++-------------
 1 files changed, 3 insertions(+), 13 deletions(-)

diff --git a/sound/oss/mpu401.c b/sound/oss/mpu401.c
index 6c0a770..1b2316f 100644
--- a/sound/oss/mpu401.c
+++ b/sound/oss/mpu401.c
@@ -926,31 +926,21 @@ static struct midi_operations mpu401_midi_operations[MAX_MIDI_DEV];
 static void mpu401_chk_version(int n, struct mpu_config *devc)
 {
 	int tmp;
-	unsigned long flags;
 
 	devc->version = devc->revision = 0;
 
-	spin_lock_irqsave(&devc->lock,flags);
-	if ((tmp = mpu_cmd(n, 0xAC, 0)) < 0)
-	{
-		spin_unlock_irqrestore(&devc->lock,flags);
+	tmp = mpu_cmd(n, 0xAC, 0);
+	if (tmp < 0)
 		return;
-	}
 	if ((tmp & 0xf0) > 0x20)	/* Why it's larger than 2.x ??? */
-	{
-		spin_unlock_irqrestore(&devc->lock,flags);
 		return;
-	}
 	devc->version = tmp;
 
-	if ((tmp = mpu_cmd(n, 0xAD, 0)) < 0)
-	{
+	if ((tmp = mpu_cmd(n, 0xAD, 0)) < 0) {
 		devc->version = 0;
-		spin_unlock_irqrestore(&devc->lock,flags);
 		return;
 	}
 	devc->revision = tmp;
-	spin_unlock_irqrestore(&devc->lock,flags);
 }
 
 int attach_mpu401(struct address_info *hw_config, struct module *owner)
-- 
1.6.3.2

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