Return-path: Received: from mail.atheros.com ([12.36.123.2]:22582 "EHLO mail.atheros.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751828Ab0DFJhm (ORCPT ); Tue, 6 Apr 2010 05:37:42 -0400 Received: from mail.atheros.com ([10.10.20.105]) by sidewinder.atheros.com for ; Tue, 06 Apr 2010 02:37:42 -0700 From: Sujith MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Message-ID: <19387.1459.438884.832345@gargle.gargle.HOWL> Date: Tue, 6 Apr 2010 15:28:11 +0530 To: CC: Subject: [PATCH 1/5] ath9k_htc: Protect RX stream variables Sender: linux-wireless-owner@vger.kernel.org List-ID: Use a spin lock to prevent concurrent access to variables dealing with RX stream mode handling. Currently, no protection is implemented - which causes problems in RX. Signed-off-by: Sujith --- drivers/net/wireless/ath/ath9k/hif_usb.c | 8 ++++++++ drivers/net/wireless/ath/ath9k/hif_usb.h | 1 + 2 files changed, 9 insertions(+), 0 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c index 3afc747..8838cdf 100644 --- a/drivers/net/wireless/ath/ath9k/hif_usb.c +++ b/drivers/net/wireless/ath/ath9k/hif_usb.c @@ -330,6 +330,8 @@ static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev, u16 pkt_len, pkt_tag, pool_index = 0; u8 *ptr; + spin_lock(&hif_dev->rx_lock); + rx_remain_len = hif_dev->rx_remain_len; rx_pkt_len = hif_dev->rx_transfer_len; @@ -356,6 +358,8 @@ static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev, } } + spin_unlock(&hif_dev->rx_lock); + while (index < len) { ptr = (u8 *) skb->data; @@ -373,6 +377,7 @@ static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev, index = index + 4 + pkt_len + pad_len; if (index > MAX_RX_BUF_SIZE) { + spin_lock(&hif_dev->rx_lock); hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE; hif_dev->rx_transfer_len = MAX_RX_BUF_SIZE - chk_idx - 4; @@ -384,6 +389,7 @@ static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev, dev_err(&hif_dev->udev->dev, "ath9k_htc: RX memory allocation" " error\n"); + spin_unlock(&hif_dev->rx_lock); goto err; } skb_reserve(nskb, 32); @@ -394,6 +400,7 @@ static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev, /* Record the buffer pointer */ hif_dev->remain_skb = nskb; + spin_unlock(&hif_dev->rx_lock); } else { nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC); if (!nskb) { @@ -612,6 +619,7 @@ static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev) int i, ret; init_usb_anchor(&hif_dev->rx_submitted); + spin_lock_init(&hif_dev->rx_lock); for (i = 0; i < MAX_RX_URB_NUM; i++) { diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.h b/drivers/net/wireless/ath/ath9k/hif_usb.h index ea9257b..ed9708c 100644 --- a/drivers/net/wireless/ath/ath9k/hif_usb.h +++ b/drivers/net/wireless/ath/ath9k/hif_usb.h @@ -93,6 +93,7 @@ struct hif_device_usb { int rx_pkt_len; int rx_transfer_len; int rx_pad_len; + spinlock_t rx_lock; u8 flags; /* HIF_USB_* */ }; -- 1.7.0.3