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authorIlan Elias <ilane@ti.com>2011-09-22 11:36:19 +0300
committerJohn W. Linville <linville@tuxdriver.com>2011-09-27 14:34:05 -0400
commit38f04c6b1b682f1879441e2925403ad9aff9e229 (patch)
treecfd23b3e84b078049b69b81a0fe10f4442ca503f /net/nfc/nci/core.c
parentde054799b7ffee8ce1e3971a8dcd7816ccf04977 (diff)
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.c10
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 = {