Staging: comedi: fix signal handling in read and write

commit 6a9ce6b654e491981f6ef7e214cbd4f63e033848 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 48ac52b33fd30cb7aa3f36f8875cf879e7dd29a7..f6a0e76555a23739fbf301aa15df0cb085b30b73 100644 (file)
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1594,11 +1594,11 @@ static ssize_t comedi_write(struct file *file, const char *buf, size_t nbytes,
                                retval = -EAGAIN;
                                break;
                        }
+                       schedule();
                        if (signal_pending(current)) {
                                retval = -ERESTARTSYS;
                                break;
                        }
-                       schedule();
                        if (!s->busy)
                                break;
                        if (s->busy != file) {
@@ -1701,11 +1701,11 @@ static ssize_t comedi_read(struct file *file, char *buf, size_t nbytes,
                                retval = -EAGAIN;
                                break;
                        }
+                       schedule();
                        if (signal_pending(current)) {
                                retval = -ERESTARTSYS;
                                break;
                        }
-                       schedule();
                        if (!s->busy) {
                                retval = 0;
                                break;