diff options
| author | Johan Hovold <jhovold@gmail.com> | 2010-05-19 00:01:32 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-20 13:21:49 -0700 |
| commit | 6d1bf48e240bde4e9c7313ccdd2fe32f37f67ad4 (patch) | |
| tree | e2fd1e7a4d65f2ec1fd29f3aa26471a0f40c4833 | |
| parent | 12e2e52cc578714d5824a27dd1a131a5418d636b (diff) | |
USB: safe_serial: straighten out read processing
Clean up read processing logic.
Tested using a cp210x device in a loopback setup.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/serial/safe_serial.c | 43 |
1 files changed, 21 insertions, 22 deletions
diff --git a/drivers/usb/serial/safe_serial.c b/drivers/usb/serial/safe_serial.c index d9af5c5ed9e8..a36e2313eed0 100644 --- a/drivers/usb/serial/safe_serial.c +++ b/drivers/usb/serial/safe_serial.c @@ -218,7 +218,9 @@ static void safe_process_read_urb(struct urb *urb) struct usb_serial_port *port = urb->context; unsigned char *data = urb->transfer_buffer; unsigned char length = urb->actual_length; + int actual_length; struct tty_struct *tty; + __u16 fcs; if (!length) return; @@ -227,30 +229,27 @@ static void safe_process_read_urb(struct urb *urb) if (!tty) return; - if (safe) { - __u16 fcs; - fcs = fcs_compute10(data, length, CRC10_INITFCS); - if (!fcs) { - int actual_length = data[length - 2] >> 2; - if (actual_length <= (length - 2)) { - dev_info(&urb->dev->dev, "%s - actual: %d\n", - __func__, actual_length); - tty_insert_flip_string(tty, - data, actual_length); - tty_flip_buffer_push(tty); - } else { - dev_err(&port->dev, - "%s - inconsistent lengths %d:%d\n", - __func__, actual_length, length); - } - } else { - dev_err(&port->dev, "%s - bad CRC %x\n", __func__, fcs); - } - } else { - tty_insert_flip_string(tty, data, length); - tty_flip_buffer_push(tty); + if (!safe) + goto out; + + fcs = fcs_compute10(data, length, CRC10_INITFCS); + if (fcs) { + dev_err(&port->dev, "%s - bad CRC %x\n", __func__, fcs); + goto err; } + actual_length = data[length - 2] >> 2; + if (actual_length > (length - 2)) { + dev_err(&port->dev, "%s - inconsistent lengths %d:%d\n", + __func__, actual_length, length); + goto err; + } + dev_info(&urb->dev->dev, "%s - actual: %d\n", __func__, actual_length); + length = actual_length; +out: + tty_insert_flip_string(tty, data, length); + tty_flip_buffer_push(tty); +err: tty_kref_put(tty); } |