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>

1 files changed, 11 insertions, 16 deletions

diff --git a/drivers/usb/serial/safe_serial.c b/drivers/usb/serial/safe_serial.c
index 3fe98a52b914..e6acac49a9c8 100644
--- a/drivers/usb/serial/safe_serial.c
+++ b/drivers/usb/serial/safe_serial.c
@@ -198,7 +198,6 @@ static void safe_read_bulk_callback (struct urb *urb)
         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 @@ static void safe_read_bulk_callback (struct urb *urb)
         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 @@ static void safe_read_bulk_callback (struct urb *urb)
                         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 @@ static void safe_read_bulk_callback (struct urb *urb)
 
         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 @@ static int safe_write (struct usb_serial_port *port, const unsigned char *buf, i
 
         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 @@ static int safe_write (struct usb_serial_port *port, const unsigned char *buf, i
 
         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 (struct usb_serial_port *port, const unsigned char *buf, i
 
 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)