Return-path: Received: from wolverine01.qualcomm.com ([199.106.114.254]:2556 "EHLO wolverine01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754069AbaHFHcY (ORCPT ); Wed, 6 Aug 2014 03:32:24 -0400 From: Dedy Lansky To: "John W . Linville" CC: Vladimir Kondratiev , , Subject: [PATCH v2 02/13] wil6210: fix race in reset Date: Wed, 6 Aug 2014 10:31:50 +0300 Message-ID: <1407310322-22568-3-git-send-email-qca_dlansky@qca.qualcomm.com> (sfid-20140806_093228_049933_306E2CA8) In-Reply-To: <1407310322-22568-1-git-send-email-qca_dlansky@qca.qualcomm.com> References: <1407310322-22568-1-git-send-email-qca_dlansky@qca.qualcomm.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Vladimir Kondratiev It is important to halt USER CPU first, then MAC CPU Otherwise, race happens in the firmware Signed-off-by: Vladimir Kondratiev --- drivers/net/wireless/ath/wil6210/main.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/wil6210/main.c b/drivers/net/wireless/ath/wil6210/main.c index 3704d2a..d734283 100644 --- a/drivers/net/wireless/ath/wil6210/main.c +++ b/drivers/net/wireless/ath/wil6210/main.c @@ -327,6 +327,8 @@ static void wil_target_reset(struct wil6210_priv *wil) /* register clear = read, AND with inverted, write */ #define C(a, v) W(a, R(a) & ~v) + wmb(); /* If host reorder writes here -> race in NIC */ + W(RGF_USER_MAC_CPU_0, BIT(1)); /* mac_cpu_man_rst */ wil->hw_version = R(RGF_USER_FW_REV_ID); rev_id = wil->hw_version & 0xff; @@ -343,8 +345,9 @@ static void wil_target_reset(struct wil6210_priv *wil) wmb(); /* order is important here */ } - W(RGF_USER_MAC_CPU_0, BIT(1)); /* mac_cpu_man_rst */ W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */ + wmb(); /* If host reorder writes here -> race in NIC */ + W(RGF_USER_MAC_CPU_0, BIT(1)); /* mac_cpu_man_rst */ wmb(); /* order is important here */ W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000); -- 1.8.5.2