Return-path: Received: from ebb05.tieto.com ([131.207.168.36]:55153 "EHLO ebb05.tieto.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753787Ab3GRGdY (ORCPT ); Thu, 18 Jul 2013 02:33:24 -0400 From: Michal Kazior To: CC: , Michal Kazior Subject: [PATCH 1/3] ath10k: prevent HTC from being used after stopping Date: Thu, 18 Jul 2013 08:33:11 +0200 Message-ID: <1374129193-3533-2-git-send-email-michal.kazior@tieto.com> (sfid-20130718_083330_942502_F0AE75C3) In-Reply-To: <1374129193-3533-1-git-send-email-michal.kazior@tieto.com> References: <1374129193-3533-1-git-send-email-michal.kazior@tieto.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-wireless-owner@vger.kernel.org List-ID: It was possible to submit new HTC commands after/while HTC stopped. This led to memory corruption in some rare cases. Signed-off-by: Michal Kazior --- drivers/net/wireless/ath/ath10k/htc.c | 28 +++++++++++++--------------- drivers/net/wireless/ath/ath10k/htc.h | 4 ++-- 2 files changed, 15 insertions(+), 17 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/htc.c b/drivers/net/wireless/ath/ath10k/htc.c index 7d5a366..f5610f1 100644 --- a/drivers/net/wireless/ath/ath10k/htc.c +++ b/drivers/net/wireless/ath/ath10k/htc.c @@ -251,10 +251,14 @@ int ath10k_htc_send(struct ath10k_htc *htc, return -ENOENT; } - skb_push(skb, sizeof(struct ath10k_htc_hdr)); - spin_lock_bh(&htc->tx_lock); + if (htc->stopped) { + spin_unlock_bh(&htc->tx_lock); + return -ESHUTDOWN; + } + __skb_queue_tail(&ep->tx_queue, skb); + skb_push(skb, sizeof(struct ath10k_htc_hdr)); spin_unlock_bh(&htc->tx_lock); queue_work(htc->ar->workqueue, &ep->send_work); @@ -267,23 +271,17 @@ static int ath10k_htc_tx_completion_handler(struct ath10k *ar, { struct ath10k_htc *htc = &ar->htc; struct ath10k_htc_ep *ep = &htc->endpoint[eid]; - bool stopping; ath10k_htc_notify_tx_completion(ep, skb); /* the skb now belongs to the completion handler */ + /* note: when using TX credit flow, the re-checking of queues happens + * when credits flow back from the target. in the non-TX credit case, + * we recheck after the packet completes */ spin_lock_bh(&htc->tx_lock); - stopping = htc->stopping; - spin_unlock_bh(&htc->tx_lock); - - if (!ep->tx_credit_flow_enabled && !stopping) - /* - * note: when using TX credit flow, the re-checking of - * queues happens when credits flow back from the target. - * in the non-TX credit case, we recheck after the packet - * completes - */ + if (!ep->tx_credit_flow_enabled && !htc->stopped) queue_work(ar->workqueue, &ep->send_work); + spin_unlock_bh(&htc->tx_lock); return 0; } @@ -948,7 +946,7 @@ void ath10k_htc_stop(struct ath10k_htc *htc) struct ath10k_htc_ep *ep; spin_lock_bh(&htc->tx_lock); - htc->stopping = true; + htc->stopped = true; spin_unlock_bh(&htc->tx_lock); for (i = ATH10K_HTC_EP_0; i < ATH10K_HTC_EP_COUNT; i++) { @@ -957,7 +955,6 @@ void ath10k_htc_stop(struct ath10k_htc *htc) } ath10k_hif_stop(htc->ar); - ath10k_htc_reset_endpoint_states(htc); } /* registered target arrival callback from the HIF layer */ @@ -969,6 +966,7 @@ int ath10k_htc_init(struct ath10k *ar) spin_lock_init(&htc->tx_lock); + htc->stopped = false; ath10k_htc_reset_endpoint_states(htc); /* setup HIF layer callbacks */ diff --git a/drivers/net/wireless/ath/ath10k/htc.h b/drivers/net/wireless/ath/ath10k/htc.h index 1606c9f..e1dd8c7 100644 --- a/drivers/net/wireless/ath/ath10k/htc.h +++ b/drivers/net/wireless/ath/ath10k/htc.h @@ -335,7 +335,7 @@ struct ath10k_htc { struct ath10k *ar; struct ath10k_htc_ep endpoint[ATH10K_HTC_EP_COUNT]; - /* protects endpoint and stopping fields */ + /* protects endpoint and stopped fields */ spinlock_t tx_lock; struct ath10k_htc_ops htc_ops; @@ -349,7 +349,7 @@ struct ath10k_htc { struct ath10k_htc_svc_tx_credits service_tx_alloc[ATH10K_HTC_EP_COUNT]; int target_credit_size; - bool stopping; + bool stopped; }; int ath10k_htc_init(struct ath10k *ar); -- 1.7.9.5