Return-path: Received: from wolverine02.qualcomm.com ([199.106.114.251]:24410 "EHLO wolverine02.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751715AbdALNPU (ORCPT ); Thu, 12 Jan 2017 08:15:20 -0500 From: Maya Erez To: Kalle Valo Cc: Lior David , linux-wireless@vger.kernel.org, wil6210@qca.qualcomm.com, Maya Erez Subject: [PATCH v2 06/13] wil6210: missing reinit_completion in wmi_call Date: Thu, 12 Jan 2017 15:05:58 +0200 Message-Id: <1484226365-10433-7-git-send-email-qca_merez@qca.qualcomm.com> (sfid-20170112_141533_592382_257C6409) In-Reply-To: <1484226365-10433-1-git-send-email-qca_merez@qca.qualcomm.com> References: <1484226365-10433-1-git-send-email-qca_merez@qca.qualcomm.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Lior David The code in wmi_call uses the wil->wmi_call completion structure to wait for a reply. In some scenarios, complete was called twice on the completion structure. This happened mainly with a disconnect event which can arrive both unsolicited and as a reply to a disconnect request. In this case the completion structure was left marked as "done" and the next wmi_call returned immediately with a corrupted reply buffer. This caused unexpected results including crashes. Fix this by adding the missing call to reinit_completion. Signed-off-by: Lior David Signed-off-by: Maya Erez --- drivers/net/wireless/ath/wil6210/wmi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/wireless/ath/wil6210/wmi.c b/drivers/net/wireless/ath/wil6210/wmi.c index 0137ac5..d30b3fc 100644 --- a/drivers/net/wireless/ath/wil6210/wmi.c +++ b/drivers/net/wireless/ath/wil6210/wmi.c @@ -957,6 +957,7 @@ int wmi_call(struct wil6210_priv *wil, u16 cmdid, void *buf, u16 len, wil->reply_id = reply_id; wil->reply_buf = reply; wil->reply_size = reply_size; + reinit_completion(&wil->wmi_call); spin_unlock(&wil->wmi_ev_lock); rc = __wmi_send(wil, cmdid, buf, len); -- 1.9.1