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path: root/drivers/nfc
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Diffstat (limited to 'drivers/nfc')
-rw-r--r--drivers/nfc/port100.c42
1 files changed, 37 insertions, 5 deletions
diff --git a/drivers/nfc/port100.c b/drivers/nfc/port100.c
index 14a3cc2d0fd6..909e3df2c16a 100644
--- a/drivers/nfc/port100.c
+++ b/drivers/nfc/port100.c
@@ -456,6 +456,12 @@ struct port100 {
struct urb *out_urb;
struct urb *in_urb;
+ /* This mutex protects the out_urb and avoids to submit a new command
+ * through port100_send_frame_async() while the previous one is being
+ * canceled through port100_abort_cmd().
+ */
+ struct mutex out_urb_lock;
+
struct work_struct cmd_complete_work;
u8 cmd_type;
@@ -464,6 +470,8 @@ struct port100 {
* for any queuing/locking mechanism at driver level.
*/
struct port100_cmd *cmd;
+
+ bool cmd_cancel;
};
struct port100_cmd {
@@ -718,10 +726,22 @@ static int port100_send_ack(struct port100 *dev)
{
int rc;
+ mutex_lock(&dev->out_urb_lock);
+
+ usb_kill_urb(dev->out_urb);
+
dev->out_urb->transfer_buffer = ack_frame;
dev->out_urb->transfer_buffer_length = sizeof(ack_frame);
rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
+ /* Set the cmd_cancel flag only if the URB has been successfully
+ * submitted. It will be reset by the out URB completion callback
+ * port100_send_complete().
+ */
+ dev->cmd_cancel = !rc;
+
+ mutex_unlock(&dev->out_urb_lock);
+
return rc;
}
@@ -730,6 +750,16 @@ static int port100_send_frame_async(struct port100 *dev, struct sk_buff *out,
{
int rc;
+ mutex_lock(&dev->out_urb_lock);
+
+ /* A command cancel frame as been sent through dev->out_urb. Don't try
+ * to submit a new one.
+ */
+ if (dev->cmd_cancel) {
+ rc = -EAGAIN;
+ goto exit;
+ }
+
dev->out_urb->transfer_buffer = out->data;
dev->out_urb->transfer_buffer_length = out->len;
@@ -741,16 +771,15 @@ static int port100_send_frame_async(struct port100 *dev, struct sk_buff *out,
rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
if (rc)
- return rc;
+ goto exit;
rc = port100_submit_urb_for_ack(dev, GFP_KERNEL);
if (rc)
- goto error;
+ usb_unlink_urb(dev->out_urb);
- return 0;
+exit:
+ mutex_unlock(&dev->out_urb_lock);
-error:
- usb_unlink_urb(dev->out_urb);
return rc;
}
@@ -892,6 +921,8 @@ static void port100_send_complete(struct urb *urb)
{
struct port100 *dev = urb->context;
+ dev->cmd_cancel = false;
+
switch (urb->status) {
case 0:
break; /* success */
@@ -1455,6 +1486,7 @@ static int port100_probe(struct usb_interface *interface,
if (!dev)
return -ENOMEM;
+ mutex_init(&dev->out_urb_lock);
dev->udev = usb_get_dev(interface_to_usbdev(interface));
dev->interface = interface;
usb_set_intfdata(interface, dev);