[PATCH] dma/idxd: fix missing default for workqueue options

[Bruce Richardson <bruce.richardson@intel.com>]

When no --wq-option flag is passed to dpdk_idxd_cfg.py script, the
default value used by argparse is None. This leads to later errors which
are expecting an array value:

	TypeError: 'NoneType' object is not iterable

This is fixed by specifying that the empty array should be the default
if no flags are passed.

Fixes: 94b0f04dc0e3 ("dma/idxd: add generic option for queue config")

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 drivers/dma/idxd/dpdk_idxd_cfg.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/idxd/dpdk_idxd_cfg.py b/drivers/dma/idxd/dpdk_idxd_cfg.py
index 77c473b240..41b4d13b9c 100755
--- a/drivers/dma/idxd/dpdk_idxd_cfg.py
+++ b/drivers/dma/idxd/dpdk_idxd_cfg.py
@@ -122,7 +122,7 @@ def main(args):
     arg_p.add_argument('--name-prefix', metavar='prefix', dest='prefix',
                        default="dpdk",
                        help="Prefix for workqueue name to mark for DPDK use [default: 'dpdk']")
-    arg_p.add_argument('--wq-option', action='append',
+    arg_p.add_argument('--wq-option', action='append', default=[],
                        help="Provide additional config option for queues (format 'x=y')")
     arg_p.add_argument('--reset', action='store_true',
                        help="Reset DSA device and its queues")
-- 
2.34.1