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@gnudd.com>
Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 88caa7376999..ebdcecda3583 100644
--- 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 *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) {
@@ -1780,11 +1780,11 @@ 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;