linux-kernel - [067/104] Staging: comedi: fix signal handling in read and write

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Date:	Wed, 07 Dec 2011 08:12:09 -0800
From:	Greg KH <gregkh@...e.de>
To:	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Cc:	<torvalds@...ux-foundation.org>, <akpm@...ux-foundation.org>,
	<alan@...rguk.ukuu.org.uk>, Alessandro Rubini <rubini@...dd.com>,
	Federico Vaga <federico.vaga@...il.com>
Subject: [067/104] Staging: comedi: fix signal handling in read and write

3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Federico Vaga <federico.vaga@...il.com>

commit 6a9ce6b654e491981f6ef7e214cbd4f63e033848 upstream.

After sleeping on a wait queue, signal_pending(current) should be
checked (not before sleeping).

Acked-by: Alessandro Rubini <rubini@...dd.com>
Signed-off-by: Federico Vaga <federico.vaga@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/staging/comedi/comedi_fops.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1673,11 +1673,11 @@ static ssize_t comedi_write(struct file
 				retval = -EAGAIN;
 				break;
 			}
+			schedule();
 			if (signal_pending(current)) {
 				retval = -ERESTARTSYS;
 				break;
 			}
-			schedule();
 			if (!s->busy)
 				break;
 			if (s->busy != file) {
@@ -1780,11 +1780,11 @@ static ssize_t comedi_read(struct file *
 				retval = -EAGAIN;
 				break;
 			}
+			schedule();
 			if (signal_pending(current)) {
 				retval = -ERESTARTSYS;
 				break;
 			}
-			schedule();
 			if (!s->busy) {
 				retval = 0;
 				break;


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