Return-path: Received: from mail.atheros.com ([12.36.123.2]:47728 "EHLO mail.atheros.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757030Ab0EKKyY (ORCPT ); Tue, 11 May 2010 06:54:24 -0400 Received: from mail.atheros.com ([10.10.20.105]) by sidewinder.atheros.com for ; Tue, 11 May 2010 03:54:24 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Message-ID: <19433.14195.321284.643261@gargle.gargle.HOWL> Date: Tue, 11 May 2010 16:24:43 +0530 To: CC: Subject: [PATCH 4/5] ath9k_htc: Fix target ready race condition From: Sender: linux-wireless-owner@vger.kernel.org List-ID: The ready message from the target could be processed before the host HW init has completed. In this case, htc_process_target_rdy() would assume the target has timed out, when it hasn't. Fix this by checking if the target has sent the ready message properly. Signed-off-by: Sujith --- drivers/net/wireless/ath/ath9k/htc_drv_init.c | 7 +++++++ drivers/net/wireless/ath/ath9k/htc_hst.c | 3 +++ drivers/net/wireless/ath/ath9k/htc_hst.h | 1 + 3 files changed, 11 insertions(+), 0 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_init.c b/drivers/net/wireless/ath/ath9k/htc_drv_init.c index 17111fc..dc01507 100644 --- a/drivers/net/wireless/ath/ath9k/htc_drv_init.c +++ b/drivers/net/wireless/ath/ath9k/htc_drv_init.c @@ -81,6 +81,11 @@ static int ath9k_htc_wait_for_target(struct ath9k_htc_priv *priv) { int time_left; + if (atomic_read(&priv->htc->tgt_ready) > 0) { + atomic_dec(&priv->htc->tgt_ready); + return 0; + } + /* Firmware can take up to 50ms to get ready, to be safe use 1 second */ time_left = wait_for_completion_timeout(&priv->htc->target_wait, HZ); if (!time_left) { @@ -88,6 +93,8 @@ static int ath9k_htc_wait_for_target(struct ath9k_htc_priv *priv) return -ETIMEDOUT; } + atomic_dec(&priv->htc->tgt_ready); + return 0; } diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c b/drivers/net/wireless/ath/ath9k/htc_hst.c index 2c8006a..e86e172 100644 --- a/drivers/net/wireless/ath/ath9k/htc_hst.c +++ b/drivers/net/wireless/ath/ath9k/htc_hst.c @@ -95,6 +95,7 @@ static void htc_process_target_rdy(struct htc_target *target, endpoint = &target->endpoint[ENDPOINT0]; endpoint->service_id = HTC_CTRL_RSVD_SVC; endpoint->max_msglen = HTC_MAX_CONTROL_MESSAGE_LENGTH; + atomic_inc(&target->tgt_ready); complete(&target->target_wait); } @@ -451,6 +452,8 @@ struct htc_target *ath9k_htc_hw_alloc(void *hif_handle, endpoint->ul_pipeid = hif->control_ul_pipe; endpoint->dl_pipeid = hif->control_dl_pipe; + atomic_set(&target->tgt_ready, 0); + return target; } diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.h b/drivers/net/wireless/ath/ath9k/htc_hst.h index d216c0f..4f1cdb0 100644 --- a/drivers/net/wireless/ath/ath9k/htc_hst.h +++ b/drivers/net/wireless/ath/ath9k/htc_hst.h @@ -147,6 +147,7 @@ struct htc_target { u16 credits; u16 credit_size; u8 htc_flags; + atomic_t tgt_ready; }; enum htc_msg_id { -- 1.7.1 --