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brcmfmac: fix NULL pointer access in brcmf_fweh_detach() 

brcmf_fweh_detach can be called while ifp is already NULL, due to
init error. Fix NULL pointer access by checking ifp.

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>
This commit is contained in:
Hante Meuleman 2012-11-14 18:46:13 -08:00 committed by John W. Linville
parent 0b63cb71f1
commit df19e777e0
1 changed files with 7 additions and 5 deletions
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12
drivers/net/wireless/brcm80211/brcmfmac/fweh.c
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@ -374,11 +374,13 @@ void brcmf_fweh_detach(struct brcmf_pub *drvr)
struct brcmf_if *ifp = drvr->iflist[0];
s8 eventmask[BRCMF_EVENTING_MASK_LEN];
/* clear all events */
memset(eventmask, 0, BRCMF_EVENTING_MASK_LEN);
(void)brcmf_fil_iovar_data_set(ifp, "event_msgs",
eventmask, BRCMF_EVENTING_MASK_LEN);
if (ifp) {
/* clear all events */
memset(eventmask, 0, BRCMF_EVENTING_MASK_LEN);
(void)brcmf_fil_iovar_data_set(ifp, "event_msgs",
eventmask,
BRCMF_EVENTING_MASK_LEN);
}
/* cancel the worker */
cancel_work_sync(&fweh->event_work);
WARN_ON(!list_empty(&fweh->event_q));