brcmfmac: on halting driver check before release or free.

brcmf_netdev_stop shall first check bus_if status before bringing
down cfg80211. brcmf_detach shall first check if driver is
allocated.

Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c
index a0d8950..2bb1207 100644 (file)
--- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c
@@ -600,10 +600,12 @@ static int brcmf_netdev_stop(struct net_device *ndev)
        struct brcmf_pub *drvr = ifp->drvr;
 
        brcmf_dbg(TRACE, "Enter\n");
-       brcmf_cfg80211_down(drvr->config);
+
        if (drvr->bus_if->drvr_up == 0)
                return 0;
 
+       brcmf_cfg80211_down(drvr->config);
+
        /* Set state and stop OS transmissions */
        drvr->bus_if->drvr_up = false;
        netif_stop_queue(ndev);
@@ -905,6 +907,8 @@ void brcmf_detach(struct device *dev)
 
        brcmf_dbg(TRACE, "Enter\n");
 
+       if (drvr == NULL)
+               return;
 
        /* make sure primary interface removed last */
        for (i = BRCMF_MAX_IFS-1; i > -1; i--)