linux-kernel - [PATCH] net: qualcomm: rmnet: Allow partial updates of IFLA

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Message-Id: <20210422182045.1040966-1-bjorn.andersson@linaro.org>
Date:   Thu, 22 Apr 2021 13:20:45 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Sean Tranchetti <stranche@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Daniele Palmas <dnlplm@...il.com>,
        Alex Elder <elder@...aro.org>,
        Aleksander Morgado <aleksander@...ksander.es>,
        Loic Poulain <loic.poulain@...aro.org>
Subject: [PATCH] net: qualcomm: rmnet: Allow partial updates of IFLA_FLAGS

The idiomatic way to handle the changelink flags/mask pair seems to be
allow partial updates of the driver's link flags. In contrast the rmnet
driver masks the incoming flags and then use that as the new flags.

Change the rmnet driver to follow the common scheme, before the
introduction of IFLA_RMNET_FLAGS handling in iproute2 et al.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
index 8d51b0cb545c..2c8db2fcc53d 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
@@ -336,7 +336,8 @@ static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[],
 
 		old_data_format = port->data_format;
 		flags = nla_data(data[IFLA_RMNET_FLAGS]);
-		port->data_format = flags->flags & flags->mask;
+		port->data_format &= ~flags->mask;
+		port->data_format |= flags->flags & flags->mask;
 
 		if (rmnet_vnd_update_dev_mtu(port, real_dev)) {
 			port->data_format = old_data_format;
-- 
2.31.0