1 files changed, 25 insertions, 13 deletions

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 96a8c7713212..2c20e88a91b3 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -214,6 +214,7 @@ struct moschip_port {
         spinlock_t pool_lock;
         struct urb *write_urb_pool[NUM_URBS];
         char busy[NUM_URBS];
+        bool read_urb_busy;
 };
 
 
@@ -679,26 +680,30 @@ static void mos7840_bulk_in_callback(struct urb *urb)
         struct tty_struct *tty;
         int status = urb->status;
 
-        if (status) {
-                dbg("nonzero read bulk status received: %d", status);
-                return;
-        }
-
         mos7840_port = urb->context;
         if (!mos7840_port) {
                 dbg("%s", "NULL mos7840_port pointer \n");
+                mos7840_port->read_urb_busy = false;
+                return;
+        }
+
+        if (status) {
+                dbg("nonzero read bulk status received: %d", status);
+                mos7840_port->read_urb_busy = false;
                 return;
         }
 
         port = (struct usb_serial_port *)mos7840_port->port;
         if (mos7840_port_paranoia_check(port, __func__)) {
                 dbg("%s", "Port Paranoia failed \n");
+                mos7840_port->read_urb_busy = false;
                 return;
         }
 
         serial = mos7840_get_usb_serial(port, __func__);
         if (!serial) {
                 dbg("%s\n", "Bad serial pointer ");
+                mos7840_port->read_urb_busy = false;
                 return;
         }
 
@@ -725,17 +730,19 @@ static void mos7840_bulk_in_callback(struct urb *urb)
 
         if (!mos7840_port->read_urb) {
                 dbg("%s", "URB KILLED !!!\n");
+                mos7840_port->read_urb_busy = false;
                 return;
         }
 
 
         mos7840_port->read_urb->dev = serial->dev;
 
+        mos7840_port->read_urb_busy = true;
         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 
         if (retval) {
-                dbg(" usb_submit_urb(read bulk) failed, retval = %d",
-                 retval);
+                dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
+                mos7840_port->read_urb_busy = false;
         }
 }
 
@@ -1055,10 +1062,12 @@ static int mos7840_open(struct tty_struct *tty,
 
         dbg("mos7840_open: bulkin endpoint is %d\n",
             port->bulk_in_endpointAddress);
+        mos7840_port->read_urb_busy = true;
         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
         if (response) {
                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
                         __func__, response);
+                mos7840_port->read_urb_busy = false;
         }
 
         /* initialize our wait queues */
@@ -1227,6 +1236,7 @@ static void mos7840_close(struct tty_struct *tty,
                 if (mos7840_port->read_urb) {
                         dbg("%s", "Shutdown bulk read\n");
                         usb_kill_urb(mos7840_port->read_urb);
+                        mos7840_port->read_urb_busy = false;
                 }
                 if ((&mos7840_port->control_urb)) {
                         dbg("%s", "Shutdown control read\n");
@@ -2043,14 +2053,14 @@ static void mos7840_change_port_settings(struct tty_struct *tty,
         Data = 0x0c;
         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 
-        if (mos7840_port->read_urb->status != -EINPROGRESS) {
+        if (mos7840_port->read_urb_busy == false) {
                 mos7840_port->read_urb->dev = serial->dev;
-
+                mos7840_port->read_urb_busy = true;
                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
-
                 if (status) {
-                        dbg(" usb_submit_urb(read bulk) failed, status = %d",
+                        dbg("usb_submit_urb(read bulk) failed, status = %d",
                             status);
+                        mos7840_port->read_urb_busy = false;
                 }
         }
         wake_up(&mos7840_port->delta_msr_wait);
@@ -2117,12 +2127,14 @@ static void mos7840_set_termios(struct tty_struct *tty,
                 return;
         }
 
-        if (mos7840_port->read_urb->status != -EINPROGRESS) {
+        if (mos7840_port->read_urb_busy == false) {
                 mos7840_port->read_urb->dev = serial->dev;
+                mos7840_port->read_urb_busy = true;
                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
                 if (status) {
-                        dbg(" usb_submit_urb(read bulk) failed, status = %d",
+                        dbg("usb_submit_urb(read bulk) failed, status = %d",
                             status);
+                        mos7840_port->read_urb_busy = false;
                 }
         }
         return;