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brcmfmac: Only handle p2p_stop_device if vif is valid 

In some situations it is possible that vif has been removed while
cfg80211 invokes the p2p_stop_device handler. This will result in
crash.

Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Hante Meuleman 2015-09-18 22:08:13 +02:00 committed by Kalle Valo
parent 9831bcb987
commit d1bb34c128
1 changed files with 11 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/net/wireless/brcm80211/brcmfmac/p2p.c
View File

@ -2327,11 +2327,17 @@ void brcmf_p2p_stop_device(struct wiphy *wiphy, struct wireless_dev *wdev)
struct brcmf_cfg80211_vif *vif;
vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev);
mutex_lock(&cfg->usr_sync);
(void)brcmf_p2p_deinit_discovery(p2p);
brcmf_abort_scanning(cfg);
clear_bit(BRCMF_VIF_STATUS_READY, &vif->sme_state);
mutex_unlock(&cfg->usr_sync);
/* This call can be result of the unregister_wdev call. In that case
* we dont want to do anything anymore. Just return. The config vif
* will have been cleared at this point.
*/
if (p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif == vif) {
mutex_lock(&cfg->usr_sync);
(void)brcmf_p2p_deinit_discovery(p2p);
brcmf_abort_scanning(cfg);
clear_bit(BRCMF_VIF_STATUS_READY, &vif->sme_state);
mutex_unlock(&cfg->usr_sync);
}
}
/**