diff options
| -rw-r--r-- | drivers/nfc/pn533.c | 35 |
1 files changed, 21 insertions, 14 deletions
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c index 697f154331ed..22efb6a672c4 100644 --- a/drivers/nfc/pn533.c +++ b/drivers/nfc/pn533.c @@ -1113,6 +1113,23 @@ static void pn533_send_complete(struct urb *urb) } } +static void pn533_abort_cmd(struct pn533 *dev, gfp_t flags) +{ + /* ACR122U does not support any command which aborts last + * issued command i.e. as ACK for standard PN533. Additionally, + * it behaves stange, sending broken or incorrect responses, + * when we cancel urb before the chip will send response. + */ + if (dev->device_type == PN533_DEVICE_ACR122U) + return; + + /* An ack will cancel the last issued command */ + pn533_send_ack(dev, flags); + + /* cancel the urb request */ + usb_kill_urb(dev->in_urb); +} + static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size) { struct sk_buff *skb; @@ -1631,9 +1648,6 @@ static void pn533_listen_mode_timer(unsigned long data) nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout"); - /* An ack will cancel the last issued command (poll) */ - pn533_send_ack(dev, GFP_ATOMIC); - dev->cancel_listen = 1; pn533_poll_next_mod(dev); @@ -1763,7 +1777,7 @@ static void pn533_wq_poll(struct work_struct *work) if (dev->cancel_listen == 1) { dev->cancel_listen = 0; - usb_kill_urb(dev->in_urb); + pn533_abort_cmd(dev, GFP_ATOMIC); } rc = pn533_send_poll_frame(dev); @@ -1825,12 +1839,7 @@ static void pn533_stop_poll(struct nfc_dev *nfc_dev) return; } - /* An ack will cancel the last issued command (poll) */ - pn533_send_ack(dev, GFP_KERNEL); - - /* prevent pn533_start_poll_complete to issue a new poll meanwhile */ - usb_kill_urb(dev->in_urb); - + pn533_abort_cmd(dev, GFP_KERNEL); pn533_poll_reset_mod_list(dev); } @@ -2123,10 +2132,8 @@ static int pn533_dep_link_down(struct nfc_dev *nfc_dev) pn533_poll_reset_mod_list(dev); - if (dev->tgt_mode || dev->tgt_active_prot) { - pn533_send_ack(dev, GFP_KERNEL); - usb_kill_urb(dev->in_urb); - } + if (dev->tgt_mode || dev->tgt_active_prot) + pn533_abort_cmd(dev, GFP_KERNEL); dev->tgt_active_prot = 0; dev->tgt_mode = 0; |