iio: buffer: Fix uninitialized variable ret

When !iio_buffer_space_available(rb) is true and signal_pending(current)
is false the end of the do-while loop is reached and the uninitialized
variable ret is zero checked. Fix this by initializing variable ret to
zero.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: 9eeee3b0bf19 ("iio: Add output buffer support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20211015153254.33783-1-colin.king@canonical.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index b884d78657cb29adc9c190a5ab16ef9cffd8f1bf..c97fb84623955f65ae715b4a4dcbd83012038810 100644 (file)
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -179,7 +179,7 @@ static ssize_t iio_buffer_write(struct file *filp, const char __user *buf,
        struct iio_buffer *rb = ib->buffer;
        struct iio_dev *indio_dev = ib->indio_dev;
        DEFINE_WAIT_FUNC(wait, woken_wake_function);
-       int ret;
+       int ret = 0;
        size_t written;
 
        if (!indio_dev->info)