brcmfmac: add a function designated for handling firmware fails

This improves handling PCIe firmware halts by printing a clear error
message and replaces a similar code in the SDIO bus support.

It will also allow further improvements like trying to recover from a
firmware crash.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h

@@ -262,6 +262,8 @@ void brcmf_detach(struct device *dev);
 void brcmf_dev_reset(struct device *dev);
 /* Request from bus module to initiate a coredump */
 void brcmf_dev_coredump(struct device *dev);
+/* Indication that firmware has halted or crashed */
+void brcmf_fw_crashed(struct device *dev);
 
 /* Configure the "global" bus state used by upper layers */
 void brcmf_bus_change_state(struct brcmf_bus *bus, enum brcmf_bus_state state);

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

@@ -1273,6 +1273,16 @@ void brcmf_dev_coredump(struct device *dev)
 		brcmf_dbg(TRACE, "failed to create coredump\n");
 }
 
+void brcmf_fw_crashed(struct device *dev)
+{
+	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
+	struct brcmf_pub *drvr = bus_if->drvr;
+
+	bphy_err(drvr, "Firmware has halted or crashed\n");
+
+	brcmf_dev_coredump(dev);
+}
+
 void brcmf_detach(struct device *dev)
 {
 	s32 i;

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

@@ -730,7 +730,7 @@ static void brcmf_pcie_handle_mb_data(struct brcmf_pciedev_info *devinfo)
 	}
 	if (dtoh_mb_data & BRCMF_D2H_DEV_FWHALT) {
 		brcmf_dbg(PCIE, "D2H_MB_DATA: FW HALT\n");
-		brcmf_dev_coredump(&devinfo->pdev->dev);
+		brcmf_fw_crashed(&devinfo->pdev->dev);
 	}
 }
 

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

@@ -1090,8 +1090,8 @@ static u32 brcmf_sdio_hostmail(struct brcmf_sdio *bus)
 
 	/* dongle indicates the firmware has halted/crashed */
 	if (hmb_data & HMB_DATA_FWHALT) {
-		brcmf_err("mailbox indicates firmware halted\n");
-		brcmf_dev_coredump(&sdiod->func1->dev);
+		brcmf_dbg(SDIO, "mailbox indicates firmware halted\n");
+		brcmf_fw_crashed(&sdiod->func1->dev);
 	}
 
 	/* Dongle recomposed rx frames, accept them again */