brcmfmac: simply remove flowring if bus is down

When the bus is down, eg. due to rmmod, there is no need to
attempt to inform firmware about it.
Reviewed-by: NHante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: NPieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: NFranky Lin <franky.lin@broadcom.com>
Signed-off-by: NArend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c

@@ -1398,6 +1398,13 @@ void brcmf_msgbuf_delete_flowring(struct brcmf_pub *drvr, u16 flowid)
 	u8 ifidx;
 	int err;
 
+	/* no need to submit if firmware can not be reached */
+	if (drvr->bus_if->state != BRCMF_BUS_UP) {
+		brcmf_dbg(MSGBUF, "bus down, flowring will be removed\n");
+		brcmf_msgbuf_remove_flowring(msgbuf, flowid);
+		return;
+	}
+
 	commonring = msgbuf->commonrings[BRCMF_H2D_MSGRING_CONTROL_SUBMIT];
 	brcmf_commonring_lock(commonring);
 	ret_ptr = brcmf_commonring_reserve_for_write(commonring);