[PATCH 5.15 098/917] rsi: fix occasional initialisation failure with BT coex

Greg Kroah-Hartman
2021-11-16T01:07:36Z

From: Martin Fuzzey <martin.fuzzey@flowbird.group>

commit 9b14ed6e11b72dd4806535449ca6c6962cb2369d upstream.

When BT coexistence is enabled (eg oper mode 13, which is the default)
the initialisation on startup sometimes silently fails.

In a normal initialisation we see
usb 1-1.3: Product: Wireless USB Network Module
usb 1-1.3: Manufacturer: Redpine Signals, Inc.
usb 1-1.3: SerialNumber: 000000000001
rsi_91x: rsi_probe: Initialized os intf ops
rsi_91x: rsi_load_9116_firmware: Loading chunk 0
rsi_91x: rsi_load_9116_firmware: Loading chunk 1
rsi_91x: rsi_load_9116_firmware: Loading chunk 2
rsi_91x: Max Stations Allowed = 1

But sometimes the last log is missing and the wlan net device is
not created.

Running a userspace loop that resets the hardware via a GPIO shows the
problem occurring ~5/100 resets.

The problem does not occur in oper mode 1 (wifi only).

Adding logs shows that the initialisation state machine requests a MAC
reset via rsi_send_reset_mac() but the firmware does not reply, leading
to the initialisation sequence being incomplete.

Fix this by delaying attaching the BT adapter until the wifi
initialisation has completed.

With this applied I have done > 300 reset loops with no errors.

Fixes: 716b840c7641 ("rsi: handle BT traffic in driver")
Signed-off-by: Martin Fuzzey <martin.fuzzey@flowbird.group>
CC: stable@vger.kernel.org
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1630337206-12410-2-git-send-email-martin.fuzzey@flowbird.group
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/wireless/rsi/rsi_91x_main.c | 16 +++++++++++++---
drivers/net/wireless/rsi/rsi_91x_mgmt.c | 3 +++
drivers/net/wireless/rsi/rsi_main.h | 2 ++
3 files changed, 18 insertions(+), 3 deletions(-)

--- a/drivers/net/wireless/rsi/rsi_91x_main.c
+++ b/drivers/net/wireless/rsi/rsi_91x_main.c
@@ -211,9 +211,10 @@ int rsi_read_pkt(struct rsi_common *comm
bt_pkt_type = frame_desc[offset + BT_RX_PKT_TYPE_OFST];
if (bt_pkt_type == BT_CARD_READY_IND) {
rsi_dbg(INFO_ZONE, "BT Card ready recvd\n");
- if (rsi_bt_ops.attach(common, &g_proto_ops))
- rsi_dbg(ERR_ZONE,
- "Failed to attach BT module\n");
+ if (common->fsm_state == FSM_MAC_INIT_DONE)
+ rsi_attach_bt(common);
+ else
+ common->bt_defer_attach = true;
} else {
if (common->bt_adapter)
rsi_bt_ops.recv_pkt(common->bt_adapter,
@@ -278,6 +279,15 @@ void rsi_set_bt_context(void *priv, void
}
#endif

+void rsi_attach_bt(struct rsi_common *common)
+{
+#ifdef CONFIG_RSI_COEX
+ if (rsi_bt_ops.attach(common, &g_proto_ops))
+ rsi_dbg(ERR_ZONE,
+ "Failed to attach BT module\n");
+#endif
+}
+
/**
* rsi_91x_init() - This function initializes os interface operations.
* @oper_mode: One of DEV_OPMODE_*.
--- a/drivers/net/wireless/rsi/rsi_91x_mgmt.c
+++ b/drivers/net/wireless/rsi/rsi_91x_mgmt.c
@@ -2071,6 +2071,9 @@ static int rsi_handle_ta_confirm_type(st
if (common->reinit_hw) {
complete(&common->wlan_init_completion);
} else {
+ if (common->bt_defer_attach)
+ rsi_attach_bt(common);
+
return rsi_mac80211_attach(common);
}
}
--- a/drivers/net/wireless/rsi/rsi_main.h
+++ b/drivers/net/wireless/rsi/rsi_main.h
@@ -320,6 +320,7 @@ struct rsi_common {
struct ieee80211_vif *roc_vif;

bool eapol4_confirm;
+ bool bt_defer_attach;
void *bt_adapter;

struct cfg80211_scan_request *hwscan;
@@ -401,5 +402,6 @@ struct rsi_host_intf_ops {

enum rsi_host_intf rsi_get_host_intf(void *priv);
void rsi_set_bt_context(void *priv, void *bt_context);
+void rsi_attach_bt(struct rsi_common *common);

#endif