netdev - [PATCH net 1/1] net: wwan: mhi_wwan_mbim: use correct mux

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Message-Id: <20250526130519.1604225-1-dnlplm@gmail.com>
Date: Mon, 26 May 2025 15:05:19 +0200
From: Daniele Palmas <dnlplm@...il.com>
To: Loic Poulain <loic.poulain@....qualcomm.com>,
	Sergey Ryazanov <ryazanov.s.a@...il.com>,
	Johannes Berg <johannes@...solutions.net>,
	Slark Xiao <slark_xiao@....com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	netdev@...r.kernel.org,
	Daniele Palmas <dnlplm@...il.com>
Subject: [PATCH net 1/1] net: wwan: mhi_wwan_mbim: use correct mux_id for multiplexing

When creating a multiplexed netdevice for modems requiring the WDS
custom mux_id value, the mux_id improperly starts from 1, while it
should start from WDS_BIND_MUX_DATA_PORT_MUX_ID + 1.

Fix this by moving the session_id assignment logic to mhi_mbim_newlink.

Fixes: 65bc58c3dcad ("net: wwan: mhi: make default data link id configurable")
Signed-off-by: Daniele Palmas <dnlplm@...il.com>
---
 drivers/net/wwan/mhi_wwan_mbim.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wwan/mhi_wwan_mbim.c b/drivers/net/wwan/mhi_wwan_mbim.c
index 8755c5e6a65b..c814fbd756a1 100644
--- a/drivers/net/wwan/mhi_wwan_mbim.c
+++ b/drivers/net/wwan/mhi_wwan_mbim.c
@@ -550,8 +550,8 @@ static int mhi_mbim_newlink(void *ctxt, struct net_device *ndev, u32 if_id,
 	struct mhi_mbim_link *link = wwan_netdev_drvpriv(ndev);
 	struct mhi_mbim_context *mbim = ctxt;
 
-	link->session = if_id;
 	link->mbim = mbim;
+	link->session = mhi_mbim_get_link_mux_id(link->mbim->mdev->mhi_cntrl) + if_id;
 	link->ndev = ndev;
 	u64_stats_init(&link->rx_syncp);
 	u64_stats_init(&link->tx_syncp);
@@ -607,7 +607,7 @@ static int mhi_mbim_probe(struct mhi_device *mhi_dev, const struct mhi_device_id
 {
 	struct mhi_controller *cntrl = mhi_dev->mhi_cntrl;
 	struct mhi_mbim_context *mbim;
-	int err, link_id;
+	int err;
 
 	mbim = devm_kzalloc(&mhi_dev->dev, sizeof(*mbim), GFP_KERNEL);
 	if (!mbim)
@@ -628,11 +628,8 @@ static int mhi_mbim_probe(struct mhi_device *mhi_dev, const struct mhi_device_id
 	/* Number of transfer descriptors determines size of the queue */
 	mbim->rx_queue_sz = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE);
 
-	/* Get the corresponding mux_id from mhi */
-	link_id = mhi_mbim_get_link_mux_id(cntrl);
-
 	/* Register wwan link ops with MHI controller representing WWAN instance */
-	return wwan_register_ops(&cntrl->mhi_dev->dev, &mhi_mbim_wwan_ops, mbim, link_id);
+	return wwan_register_ops(&cntrl->mhi_dev->dev, &mhi_mbim_wwan_ops, mbim, 0);
 }
 
 static void mhi_mbim_remove(struct mhi_device *mhi_dev)

base-commit: 5cdb2c77c4c3d36bdee83d9231649941157f8204
-- 
2.37.1