diff options
| author | Ilan Elias <ilane@ti.com> | 2011-09-22 11:36:19 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-09-27 14:34:05 -0400 |
| commit | 38f04c6b1b682f1879441e2925403ad9aff9e229 (patch) | |
| tree | cfd23b3e84b078049b69b81a0fe10f4442ca503f /net/nfc/nci/core.c | |
| parent | de054799b7ffee8ce1e3971a8dcd7816ccf04977 (diff) | |
| download | linux-38f04c6b1b682f1879441e2925403ad9aff9e229.tar.bz2 | |
NFC: protect nci_data_exchange transactions
Protect 'cb' and 'cb_context' arguments in nci_data_exchange.
In fact, this implements a queue with max length of 1 data
exchange transactions in parallel.
Signed-off-by: Ilan Elias <ilane@ti.com>
Acked-by: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/nfc/nci/core.c')
| -rw-r--r-- | net/nfc/nci/core.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c index 9f17e8ec0ab9..1e6b20f2bc99 100644 --- a/net/nfc/nci/core.c +++ b/net/nfc/nci/core.c @@ -453,6 +453,7 @@ static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx, void *cb_context) { struct nci_dev *ndev = nfc_get_drvdata(nfc_dev); + int rc; nfc_dbg("entry, target_idx %d, len %d", target_idx, skb->len); @@ -461,11 +462,18 @@ static int nci_data_exchange(struct nfc_dev *nfc_dev, __u32 target_idx, return -EINVAL; } + if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags)) + return -EBUSY; + /* store cb and context to be used on receiving data */ ndev->data_exchange_cb = cb; ndev->data_exchange_cb_context = cb_context; - return nci_send_data(ndev, ndev->conn_id, skb); + rc = nci_send_data(ndev, ndev->conn_id, skb); + if (rc) + clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); + + return rc; } static struct nfc_ops nci_nfc_ops = { |