linux-kernel - [PATCH] dib0700: do not lock interruptible on tear-down paths

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Date:	Thu,  3 Jan 2013 17:53:53 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	mchehab@...hat.com
Cc:	linux-media@...r.kernel.org, jirislaby@...il.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH] dib0700: do not lock interruptible on tear-down paths

When mutex_lock_interruptible is used on paths where a signal can be
pending, the device is not closed properly and cannot be reused.

This usually happens when you start tzap for example and send it a
TERM signal. The signal is pending while tear-down routines are
called. Hence streaming is not properly stopped in that case. And
the device stops working from that moment on.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/media/usb/dvb-usb/dib0700_core.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/media/usb/dvb-usb/dib0700_core.c b/drivers/media/usb/dvb-usb/dib0700_core.c
index 19b5ed2..bf2a908 100644
--- a/drivers/media/usb/dvb-usb/dib0700_core.c
+++ b/drivers/media/usb/dvb-usb/dib0700_core.c
@@ -561,10 +561,7 @@ int dib0700_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
 		}
 	}
 
-	if (mutex_lock_interruptible(&adap->dev->usb_mutex) < 0) {
-		err("could not acquire lock");
-		return -EINTR;
-	}
+	mutex_lock(&adap->dev->usb_mutex);
 
 	st->buf[0] = REQUEST_ENABLE_VIDEO;
 	/* this bit gives a kind of command,
-- 
1.8.1


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