[PATCH 10/16] brcmfmac: Only handle p2p_stop_device if vif is valid
From: Arend van Spriel <hidden>
Date: 2015-09-18 20:08:25
Subsystem:
networking drivers (wireless), the rest · Maintainers:
Johannes Berg, Linus Torvalds
From: Hante Meuleman <redacted> 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 <redacted> Reviewed-by: Pieter-Paul Giesberts <redacted> Signed-off-by: Hante Meuleman <redacted> Signed-off-by: Arend van Spriel <redacted> --- drivers/net/wireless/brcm80211/brcmfmac/p2p.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/p2p.c b/drivers/net/wireless/brcm80211/brcmfmac/p2p.c
index 83027dc..76e4771 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/p2p.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/p2p.c@@ -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); + } } /**
--
1.9.1