netdev - [PATCH net] net: wwan: iosm: fixes 7560 modem crash

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Date:   Tue, 28 Mar 2023 11:58:44 +0530
From:   m.chetan.kumar@...ux.intel.com
To:     netdev@...r.kernel.org
Cc:     kuba@...nel.org, davem@...emloft.net, johannes@...solutions.net,
        ryazanov.s.a@...il.com, loic.poulain@...aro.org,
        shaneparslow808@...il.com, m.chetan.kumar@...el.com,
        linuxwwan@...el.com,
        M Chetan Kumar <m.chetan.kumar@...ux.intel.com>,
        Martin <mwolf@...umentum.com>
Subject: [PATCH net] net: wwan: iosm: fixes 7560 modem crash

From: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>

ModemManger/Apps probing the wwan0xmmrpc0 port for 7560 Modem results in
modem crash.

7560 Modem FW uses the MBIM interface for control command communication
whereas 7360 uses Intel RPC interface so disable wwan0xmmrpc0 port for
7560.

Fixes: d08b0f8f46e4 ("net: wwan: iosm: add rpc interface for xmm modems")
Reported-and-tested-by: Martin <mwolf@...umentum.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217200
Signed-off-by: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>
Signed-off-by: Shane Parslow <shaneparslow808@...il.com>
---
 drivers/net/wwan/iosm/iosm_ipc_imem.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/wwan/iosm/iosm_ipc_imem.c b/drivers/net/wwan/iosm/iosm_ipc_imem.c
index 1e6a47976642..c066b0040a3f 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_imem.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_imem.c
@@ -587,6 +587,13 @@ static void ipc_imem_run_state_worker(struct work_struct *instance)
 	while (ctrl_chl_idx < IPC_MEM_MAX_CHANNELS) {
 		if (!ipc_chnl_cfg_get(&chnl_cfg_port, ctrl_chl_idx)) {
 			ipc_imem->ipc_port[ctrl_chl_idx] = NULL;
+
+			if (ipc_imem->pcie->pci->device == INTEL_CP_DEVICE_7560_ID &&
+			    chnl_cfg_port.wwan_port_type == WWAN_PORT_XMMRPC) {
+				ctrl_chl_idx++;
+				continue;
+			}
+
 			if (ipc_imem->pcie->pci->device == INTEL_CP_DEVICE_7360_ID &&
 			    chnl_cfg_port.wwan_port_type == WWAN_PORT_MBIM) {
 				ctrl_chl_idx++;
--
2.34.1