usb serial: more fixes and groundwork for tty changes
- If a termios change fails due to lack of memory we should copy the
old settings back over as the device has not changed
- Note various locking problems
- kl5kusb105 had various remaining tty flag handling problems
- Make safe_serial use tty_insert_flip_string not open coded loops
- set termios speed properly in usb_serial
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/safe_serial.c b/drivers/usb/serial/safe_serial.c
index 3fe98a5..e6acac4 100644
--- a/drivers/usb/serial/safe_serial.c
+++ b/drivers/usb/serial/safe_serial.c
@@ -198,7 +198,6 @@
struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
unsigned char *data = urb->transfer_buffer;
unsigned char length = urb->actual_length;
- int i;
int result;
int status = urb->status;
@@ -227,16 +226,10 @@
if (safe) {
__u16 fcs;
if (!(fcs = fcs_compute10 (data, length, CRC10_INITFCS))) {
-
int actual_length = data[length - 2] >> 2;
-
if (actual_length <= (length - 2)) {
-
info ("%s - actual: %d", __func__, actual_length);
-
- for (i = 0; i < actual_length; i++) {
- tty_insert_flip_char (port->tty, data[i], 0);
- }
+ tty_insert_flip_string(port->tty, data, actual_length);
tty_flip_buffer_push (port->tty);
} else {
err ("%s - inconsistent lengths %d:%d", __func__,
@@ -246,9 +239,7 @@
err ("%s - bad CRC %x", __func__, fcs);
}
} else {
- for (i = 0; i < length; i++) {
- tty_insert_flip_char (port->tty, data[i], 0);
- }
+ tty_insert_flip_string(port->tty, data, length);
tty_flip_buffer_push (port->tty);
}
@@ -260,6 +251,7 @@
if ((result = usb_submit_urb (urb, GFP_ATOMIC))) {
err ("%s - failed resubmitting read urb, error %d", __func__, result);
+ /* FIXME: Need a mechanism to retry later if this happens */
}
}
@@ -275,7 +267,7 @@
if (!port->write_urb) {
dbg ("%s - write urb NULL", __func__);
- return (0);
+ return 0;
}
dbg ("safe_write write_urb: %d transfer_buffer_length",
@@ -283,11 +275,11 @@
if (!port->write_urb->transfer_buffer_length) {
dbg ("%s - write urb transfer_buffer_length zero", __func__);
- return (0);
+ return 0;
}
if (count == 0) {
dbg ("%s - write request of 0 bytes", __func__);
- return (0);
+ return 0;
}
spin_lock_bh(&port->lock);
if (port->write_urb_busy) {
@@ -359,18 +351,21 @@
static int safe_write_room (struct usb_serial_port *port)
{
- int room = 0; // Default: no room
+ int room = 0; /* Default: no room */
+ unsigned long flags;
dbg ("%s", __func__);
+ spin_lock_irqsave(&port->lock, flags);
if (port->write_urb_busy)
room = port->bulk_out_size - (safe ? 2 : 0);
+ spin_unlock_irqrestore(&port->lock, flags);
if (room) {
dbg ("safe_write_room returns %d", room);
}
- return (room);
+ return room;
}
static int safe_startup (struct usb_serial *serial)