NFC: port100: Don't send a new command if one is still pending

This patch ensures that a command is not still in process before sending
a new one to the device. This can happen when neard is in constant
polling mode: the configure_hw command can be sent when neard restarts
polling after a LLCP SYMM timeout but before the device has returned in
timeout from the last DEP frame sent.

Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/nfc/port100.c b/drivers/nfc/port100.c
index 2d4bbe3fad57..14a3cc2d0fd6 100644
--- a/drivers/nfc/port100.c
+++ b/drivers/nfc/port100.c
@@ -809,6 +809,12 @@ static int port100_send_cmd_async(struct port100 *dev, u8 cmd_code,
                         PORT100_FRAME_MAX_PAYLOAD_LEN +
                         PORT100_FRAME_TAIL_LEN;
 
+        if (dev->cmd) {
+                nfc_err(&dev->interface->dev,
+                        "A command is still in process\n");
+                return -EBUSY;
+        }
+
         resp = alloc_skb(resp_len, GFP_KERNEL);
         if (!resp)
                 return -ENOMEM;