linux-kernel - [PATCH] Staging: comedi: fix signal handling in read and write

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Message-Id: <1319874459-8150-1-git-send-email-federico.vaga@gmail.com>
Date:	Sat, 29 Oct 2011 09:47:39 +0200
From:	Federico Vaga <federico.vaga@...il.com>
To:	gregkh@...e.de
Cc:	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	fmhess@...rs.sourceforge.net, abbotti@....co.uk, rubini@...dd.com,
	federico.vaga@...il.com
Subject: [PATCH] Staging: comedi: fix signal handling in read and write

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

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 21d8c1c..f4a60d5 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1640,11 +1640,11 @@ static ssize_t comedi_write(struct file *file, const char __user *buf,
 				retval = -EAGAIN;
 				break;
 			}
+			schedule();
 			if (signal_pending(current)) {
 				retval = -ERESTARTSYS;
 				break;
 			}
-			schedule();
 			if (!s->busy)
 				break;
 			if (s->busy != file) {
@@ -1741,11 +1741,11 @@ static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
 				retval = -EAGAIN;
 				break;
 			}
+			schedule();
 			if (signal_pending(current)) {
 				retval = -ERESTARTSYS;
 				break;
 			}
-			schedule();
 			if (!s->busy) {
 				retval = 0;
 				break;
-- 
1.5.6.5

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