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authorJohan Hovold <jhovold@gmail.com>2010-05-19 00:01:32 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-20 13:21:49 -0700
commit6d1bf48e240bde4e9c7313ccdd2fe32f37f67ad4 (patch)
treee2fd1e7a4d65f2ec1fd29f3aa26471a0f40c4833 /drivers/usb/serial
parent12e2e52cc578714d5824a27dd1a131a5418d636b (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>
Diffstat (limited to 'drivers/usb/serial')
-rw-r--r--drivers/usb/serial/safe_serial.c43
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);
}