From f0c9103813b3045bd5b43220b6a78c9908a45d24 Mon Sep 17 00:00:00 2001 From: Eric Lapuyade Date: Mon, 26 Nov 2012 18:06:27 +0100 Subject: NFC: Fixed nfc core and hci unregistration and cleanup When an adapter is removed, it will unregister itself from hci and/or nfc core. In order to do that safely, work tasks must first be canceled and prevented to be scheduled again, before the hci or nfc device can be destroyed. Signed-off-by: Eric Lapuyade Signed-off-by: Samuel Ortiz --- net/nfc/hci/core.c | 31 ++++++++++++++++++++++++------- net/nfc/hci/hcp.c | 7 +++++++ 2 files changed, 31 insertions(+), 7 deletions(-) (limited to 'net/nfc/hci') diff --git a/net/nfc/hci/core.c b/net/nfc/hci/core.c index 7bea574d5934..b4b84268653d 100644 --- a/net/nfc/hci/core.c +++ b/net/nfc/hci/core.c @@ -57,6 +57,8 @@ static void nfc_hci_msg_tx_work(struct work_struct *work) int r = 0; mutex_lock(&hdev->msg_tx_mutex); + if (hdev->shutting_down) + goto exit; if (hdev->cmd_pending_msg) { if (timer_pending(&hdev->cmd_timer) == 0) { @@ -868,6 +870,28 @@ void nfc_hci_unregister_device(struct nfc_hci_dev *hdev) { struct hci_msg *msg, *n; + mutex_lock(&hdev->msg_tx_mutex); + + if (hdev->cmd_pending_msg) { + if (hdev->cmd_pending_msg->cb) + hdev->cmd_pending_msg->cb( + hdev->cmd_pending_msg->cb_context, + NULL, -ESHUTDOWN); + kfree(hdev->cmd_pending_msg); + hdev->cmd_pending_msg = NULL; + } + + hdev->shutting_down = true; + + mutex_unlock(&hdev->msg_tx_mutex); + + del_timer_sync(&hdev->cmd_timer); + cancel_work_sync(&hdev->msg_tx_work); + + cancel_work_sync(&hdev->msg_rx_work); + + nfc_unregister_device(hdev->ndev); + skb_queue_purge(&hdev->rx_hcp_frags); skb_queue_purge(&hdev->msg_rx_queue); @@ -876,13 +900,6 @@ void nfc_hci_unregister_device(struct nfc_hci_dev *hdev) skb_queue_purge(&msg->msg_frags); kfree(msg); } - - del_timer_sync(&hdev->cmd_timer); - - nfc_unregister_device(hdev->ndev); - - cancel_work_sync(&hdev->msg_tx_work); - cancel_work_sync(&hdev->msg_rx_work); } EXPORT_SYMBOL(nfc_hci_unregister_device); diff --git a/net/nfc/hci/hcp.c b/net/nfc/hci/hcp.c index bc308a7ca609..b6b4109f2343 100644 --- a/net/nfc/hci/hcp.c +++ b/net/nfc/hci/hcp.c @@ -105,6 +105,13 @@ int nfc_hci_hcp_message_tx(struct nfc_hci_dev *hdev, u8 pipe, } mutex_lock(&hdev->msg_tx_mutex); + + if (hdev->shutting_down) { + err = -ESHUTDOWN; + mutex_unlock(&hdev->msg_tx_mutex); + goto out_skb_err; + } + list_add_tail(&cmd->msg_l, &hdev->msg_tx_queue); mutex_unlock(&hdev->msg_tx_mutex); -- cgit v1.2.3