iio: ensure ret is initialized to zero before entering do loop

commit 5dba4b14bafe801083d01e1f400816df7e5a8f2e upstream.

A recent fix to iio_buffer_read_first_n_outer removed ret from being set by
a return from wait_event_interruptible and also added a continue in a loop
which causes the variable ret to not be set when it reaches the end of the
loop.  Fix this by initializing ret to zero.

Also remove extraneous white space at the end of the loop.

Fixes: fcf68f3c0bb2a5 ("fix sched WARNING "do not call blocking ops when !TASK_RUNNING")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 7afd226a3321097815fb8a120bb3f0ca1461eddf..32bb036069eb032313fa95895c83b3396cd752f3 100644 (file)
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -110,7 +110,7 @@ ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
        DEFINE_WAIT_FUNC(wait, woken_wake_function);
        size_t datum_size;
        size_t to_wait;
-       int ret;
+       int ret = 0;
 
        if (!indio_dev->info)
                return -ENODEV;
@@ -153,7 +153,7 @@ ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
                ret = rb->access->read_first_n(rb, n, buf);
                if (ret == 0 && (filp->f_flags & O_NONBLOCK))
                        ret = -EAGAIN;
-        } while (ret == 0);
+       } while (ret == 0);
        remove_wait_queue(&rb->pollq, &wait);
 
        return ret;