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brcmfmac: Fix race condition bug when deleting p2p interface.

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When p2p device interface gets deleted by deinitialising discovery
it will result in an event which removes the interface, but that is
also done by delete p2p interface code. This results in race
condition which sometimes results in lockup/crash. With this patch
the delete device interface will wait for the event (with timeout)
removing the possible race condition. Also on the stop device call
from cfg80211 the deinitialisation of the discovery device should
be avoided as it can result in a similar situation.

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 22:08:16 +02:00 committed by Kalle Valo
parent 8268c2011d
commit a2044d91d9
1 changed files with 14 additions and 8 deletions
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22
drivers/net/wireless/brcm80211/brcmfmac/p2p.c
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@ -2241,6 +2241,7 @@ int brcmf_p2p_del_vif(struct wiphy *wiphy, struct wireless_dev *wdev)
brcmf_dbg(TRACE, "delete P2P vif\n");
vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev);
brcmf_cfg80211_arm_vif_event(cfg, vif);
switch (vif->wdev.iftype) {
case NL80211_IFTYPE_P2P_CLIENT:
if (test_bit(BRCMF_VIF_STATUS_DISCONNECTING, &vif->sme_state))
@ -2257,8 +2258,6 @@ int brcmf_p2p_del_vif(struct wiphy *wiphy, struct wireless_dev *wdev)
return 0;
brcmf_p2p_cancel_remain_on_channel(vif->ifp);
brcmf_p2p_deinit_discovery(p2p);
brcmf_remove_interface(vif->ifp);
return 0;
default:
return -ENOTSUPP;
}
@ -2270,10 +2269,11 @@ int brcmf_p2p_del_vif(struct wiphy *wiphy, struct wireless_dev *wdev)
wait_for_completion_timeout(&cfg->vif_disabled,
msecs_to_jiffies(500));
brcmf_vif_clear_mgmt_ies(vif);
brcmf_cfg80211_arm_vif_event(cfg, vif);
err = brcmf_p2p_release_p2p_if(vif);
err = 0;
if (vif->wdev.iftype != NL80211_IFTYPE_P2P_DEVICE) {
brcmf_vif_clear_mgmt_ies(vif);
err = brcmf_p2p_release_p2p_if(vif);
}
if (!err) {
/* wait for firmware event */
err = brcmf_cfg80211_wait_vif_event_timeout(cfg, BRCMF_E_IF_DEL,
@ -2283,8 +2283,12 @@ int brcmf_p2p_del_vif(struct wiphy *wiphy, struct wireless_dev *wdev)
else
err = 0;
}
if (err)
brcmf_remove_interface(vif->ifp);
brcmf_cfg80211_arm_vif_event(cfg, NULL);
p2p->bss_idx[P2PAPI_BSSCFG_CONNECTION].vif = NULL;
if (vif->wdev.iftype != NL80211_IFTYPE_P2P_DEVICE)
p2p->bss_idx[P2PAPI_BSSCFG_CONNECTION].vif = NULL;
return err;
}
@ -2333,7 +2337,9 @@ void brcmf_p2p_stop_device(struct wiphy *wiphy, struct wireless_dev *wdev)
*/
if (p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif == vif) {
mutex_lock(&cfg->usr_sync);
(void)brcmf_p2p_deinit_discovery(p2p);
/* Set the discovery state to SCAN */
(void)brcmf_p2p_set_discover_state(vif->ifp,
WL_P2P_DISC_ST_SCAN, 0, 0);
brcmf_abort_scanning(cfg);
clear_bit(BRCMF_VIF_STATUS_READY, &vif->sme_state);
mutex_unlock(&cfg->usr_sync);