USB serial drivers

Several functions in the serial drivers can be called from bottom
half or interrupt context. They must use the GFP_ATOMIC flag for
calls to kmalloc() and usb_submit_urb().
  
Functions which must use GFP_ATOMIC:
1. All *_callback() functions.
2. Any code which is inside a spinlock.
3. write(), throttle(), unthrottle(), which may be called by
   the line discipline in bottom half context.
  
Functions which can use GFP_KERNEL:
1. open(), close(), startup(), shutdown(), set_termios().

drivers/usb/serial/cyberjack.c

@@ -262,7 +262,7 @@ static int cyberjack_write (struct usb_serial_port *port, int from_user, const u
 			      port);
 
 		/* send the data out the bulk port */
-		result = usb_submit_urb(port->write_urb, GFP_KERNEL);
+		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 		if (result) {
 			err(__FUNCTION__ " - failed submitting write urb, error %d", result);
 			/* Throw away data. No better idea what to do with it. */
@@ -331,7 +331,7 @@ static void cyberjack_read_int_callback( struct urb *urb )
 
 		if( !old_rdtodo ) {
 			port->read_urb->dev = port->serial->dev;
-			result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+			result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 			if( result )
 				err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
 			dbg(__FUNCTION__ " - usb_submit_urb(read urb)");
@@ -387,7 +387,7 @@ static void cyberjack_read_bulk_callback (struct urb *urb)
 	/* Continue to read if we have still urbs to do. */
 	if( priv->rdtodo /* || (urb->actual_length==port->bulk_in_endpointAddress)*/ ) {
 		port->read_urb->dev = port->serial->dev;
-		result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+		result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 		if (result)
 			err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
 		dbg(__FUNCTION__ " - usb_submit_urb(read urb)");
@@ -440,7 +440,7 @@ static void cyberjack_write_bulk_callback (struct urb *urb)
 			      port);
 
 		/* send the data out the bulk port */
-		result = usb_submit_urb(port->write_urb, GFP_KERNEL);
+		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 		if (result) {
 			err(__FUNCTION__ " - failed submitting write urb, error %d", result);
 			/* Throw away data. No better idea what to do with it. */

drivers/usb/serial/digi_acceleport.c

@@ -676,7 +676,7 @@ dbg( "digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, co
 		oob_port->write_urb->transfer_buffer_length = len;
 		oob_port->write_urb->dev = port->serial->dev;
 
-		if( (ret=usb_submit_urb(oob_port->write_urb, GFP_KERNEL)) == 0 ) {
+		if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) {
 			oob_priv->dp_write_urb_in_use = 1;
 			count -= len;
 			buf += len;
@@ -764,7 +764,7 @@ count );
 		}
 		port->write_urb->dev = port->serial->dev;
 
-		if( (ret=usb_submit_urb(port->write_urb, GFP_KERNEL)) == 0 ) {
+		if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) {
 			priv->dp_write_urb_in_use = 1;
 			priv->dp_out_buf_len = 0;
 			count -= len;
@@ -841,7 +841,7 @@ port_priv->dp_port_num, modem_signals );
 	oob_port->write_urb->transfer_buffer_length = 8;
 	oob_port->write_urb->dev = port->serial->dev;
 
-	if( (ret=usb_submit_urb(oob_port->write_urb, GFP_KERNEL)) == 0 ) {
+	if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) {
 		oob_priv->dp_write_urb_in_use = 1;
 		port_priv->dp_modem_signals =
 			(port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
@@ -962,7 +962,7 @@ dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num );
 	/* restart read chain */
 	if( priv->dp_throttle_restart ) {
 		port->read_urb->dev = port->serial->dev;
-		ret = usb_submit_urb( port->read_urb, GFP_KERNEL );
+		ret = usb_submit_urb( port->read_urb, GFP_ATOMIC );
 	}
 
 	/* turn throttle off */
@@ -1323,7 +1323,7 @@ priv->dp_port_num, count, from_user, in_interrupt() );
 	/* copy in new data */
 	memcpy( data, from_user ? user_buf : buf, new_len );
 
-	if( (ret=usb_submit_urb(port->write_urb, GFP_KERNEL)) == 0 ) {
+	if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) {
 		priv->dp_write_urb_in_use = 1;
 		ret = new_len;
 		priv->dp_out_buf_len = 0;
@@ -1399,7 +1399,7 @@ dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->status );
 		memcpy( port->write_urb->transfer_buffer+2, priv->dp_out_buf,
 			priv->dp_out_buf_len );
 
-		if( (ret=usb_submit_urb(port->write_urb, GFP_KERNEL)) == 0 ) {
+		if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) {
 			priv->dp_write_urb_in_use = 1;
 			priv->dp_out_buf_len = 0;
 		}
@@ -1837,7 +1837,7 @@ dbg( "digi_read_bulk_callback: TOP" );
 
 	/* continue read */
 	urb->dev = port->serial->dev;
-	if( (ret=usb_submit_urb(urb, GFP_KERNEL)) != 0 ) {
+	if( (ret=usb_submit_urb(urb, GFP_ATOMIC)) != 0 ) {
 		err( __FUNCTION__ ": failed resubmitting urb, ret=%d, port=%d",
 			ret, priv->dp_port_num );
 	}

drivers/usb/serial/empeg.c

@@ -256,7 +256,7 @@ static int empeg_write (struct usb_serial_port *port, int from_user, const unsig
 		}
 
 		if (urb->transfer_buffer == NULL) {
-			urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
+			urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
 			if (urb->transfer_buffer == NULL) {
 				err(__FUNCTION__" no more kernel memory...");
 				goto exit;
@@ -288,7 +288,7 @@ static int empeg_write (struct usb_serial_port *port, int from_user, const unsig
 		urb->transfer_flags |= USB_QUEUE_BULK;
 
 		/* send it down the pipe */
-		status = usb_submit_urb(urb, GFP_KERNEL);
+		status = usb_submit_urb(urb, GFP_ATOMIC);
 		if (status) {
 			err(__FUNCTION__ " - usb_submit_urb(write bulk) failed with status = %d", status);
 			bytes_sent = status;
@@ -441,7 +441,7 @@ static void empeg_read_bulk_callback (struct urb *urb)
 
 	port->read_urb->transfer_flags |= USB_QUEUE_BULK;
 
-	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 
 	if (result)
 		err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
@@ -466,7 +466,7 @@ static void empeg_unthrottle (struct usb_serial_port *port)
 
 	port->read_urb->dev = port->serial->dev;
 
-	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 
 	if (result)
 		err(__FUNCTION__ " - failed submitting read urb, error %d", result);

drivers/usb/serial/ftdi_sio.c

@@ -469,7 +469,7 @@ static int ftdi_sio_write (struct usb_serial_port *port, int from_user,
 		      port->write_urb->transfer_buffer, count,
 		      ftdi_sio_write_bulk_callback, port);
 		
-	result = usb_submit_urb(port->write_urb, GFP_KERNEL);
+	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 	if (result) {
 		err(__FUNCTION__ " - failed submitting write urb, error %d", result);
 		return 0;
@@ -631,7 +631,7 @@ static void ftdi_sio_read_bulk_callback (struct urb *urb)
 		      port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
 		      ftdi_sio_read_bulk_callback, port);
 
-	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 	if (result)
 		err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
 

drivers/usb/serial/io_edgeport.c

@@ -790,7 +790,7 @@ static void edge_interrupt_callback (struct urb *urb)
 
 					/* we have pending bytes on the bulk in pipe, send a request */
 					edge_serial->read_urb->dev = edge_serial->serial->dev;
-					result = usb_submit_urb(edge_serial->read_urb, GFP_KERNEL);
+					result = usb_submit_urb(edge_serial->read_urb, GFP_ATOMIC);
 					if (result) {
 						dbg(__FUNCTION__" - usb_submit_urb(read bulk) failed with result = %d", result);
 					}
@@ -867,7 +867,7 @@ static void edge_bulk_in_callback (struct urb *urb)
 
 			/* there is, so resubmit our urb */
 			edge_serial->read_urb->dev = edge_serial->serial->dev;
-			status = usb_submit_urb(edge_serial->read_urb, GFP_KERNEL);
+			status = usb_submit_urb(edge_serial->read_urb, GFP_ATOMIC);
 			if (status) {
 				err(__FUNCTION__" - usb_submit_urb(read bulk) failed, status = %d", status);
 			}
@@ -1435,7 +1435,7 @@ static void send_more_port_data(struct edgeport_serial *edge_serial, struct edge
 
 	/* build the data header for the buffer and port that we are about to send out */
 	count = fifo->count;
-	buffer = kmalloc (count+2, GFP_KERNEL);
+	buffer = kmalloc (count+2, GFP_ATOMIC);
 	if (buffer == NULL) {
 		err(__FUNCTION__" - no more kernel memory...");
 		edge_port->write_in_progress = FALSE;
@@ -1474,7 +1474,7 @@ static void send_more_port_data(struct edgeport_serial *edge_serial, struct edge
 	urb->transfer_flags |= USB_QUEUE_BULK;
 
 	urb->dev = edge_serial->serial->dev;
-	status = usb_submit_urb(urb, GFP_KERNEL);
+	status = usb_submit_urb(urb, GFP_ATOMIC);
 	if (status) {
 		/* something went wrong */
 		dbg(__FUNCTION__" - usb_submit_urb(write bulk) failed");
@@ -2431,7 +2431,7 @@ static int send_iosp_ext_cmd (struct edgeport_port *edge_port, __u8 command, __u
 
 	dbg(__FUNCTION__" - %d, %d", command, param);
 
-	buffer =  kmalloc (10, GFP_KERNEL);
+	buffer =  kmalloc (10, GFP_ATOMIC);
 	if (!buffer) {
 		err(__FUNCTION__" - kmalloc(%d) failed.\n", 10);
 		return -ENOMEM;
@@ -2467,7 +2467,7 @@ static int write_cmd_usb (struct edgeport_port *edge_port, unsigned char *buffer
 	usb_serial_debug_data (__FILE__, __FUNCTION__, length, buffer);
 
 	/* Allocate our next urb */
-	urb = usb_alloc_urb (0, GFP_KERNEL);
+	urb = usb_alloc_urb (0, GFP_ATOMIC);
 	if (!urb)
 		return -ENOMEM;
 
@@ -2482,7 +2482,7 @@ static int write_cmd_usb (struct edgeport_port *edge_port, unsigned char *buffer
 	urb->transfer_flags |= USB_QUEUE_BULK;
 
 	edge_port->commandPending = TRUE;
-	status = usb_submit_urb(urb, GFP_KERNEL);
+	status = usb_submit_urb(urb, GFP_ATOMIC);
 
 	if (status) {
 		/* something went wrong */
@@ -2532,7 +2532,7 @@ static int send_cmd_write_baud_rate (struct edgeport_port *edge_port, int baudRa
 	}
 
 	// Alloc memory for the string of commands.
-	cmdBuffer =  kmalloc (0x100, GFP_KERNEL);
+	cmdBuffer =  kmalloc (0x100, GFP_ATOMIC);
 	if (!cmdBuffer) {
 		err(__FUNCTION__" - kmalloc(%d) failed.\n", 0x100);
 		return -ENOMEM;
@@ -2618,7 +2618,7 @@ static int send_cmd_write_uart_register (struct edgeport_port *edge_port, __u8 r
 	dbg (__FUNCTION__" - write to %s register 0x%02x", (regNum == MCR) ? "MCR" : "LCR", regValue);
 
 	// Alloc memory for the string of commands.
-	cmdBuffer = kmalloc (0x10, GFP_KERNEL);
+	cmdBuffer = kmalloc (0x10, GFP_ATOMIC);
 	if (cmdBuffer == NULL ) {
 		return -ENOMEM;
 	}

drivers/usb/serial/ipaq.c

@@ -297,7 +297,7 @@ static void ipaq_read_bulk_callback(struct urb *urb)
 		      usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
 		      port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
 		      ipaq_read_bulk_callback, port);
-	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 	if (result)
 		err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
 	return;
@@ -412,7 +412,7 @@ static int ipaq_write_flush(struct usb_serial_port *port)
 		      usb_sndbulkpipe(serial->dev, port->bulk_out_endpointAddress),
 		      port->write_urb->transfer_buffer, count, ipaq_write_bulk_callback,
 		      port);
-	result = usb_submit_urb(urb, GFP_KERNEL);
+	result = usb_submit_urb(urb, GFP_ATOMIC);
 	if (result) {
 		err(__FUNCTION__ " - failed submitting write urb, error %d", result);
 	}

drivers/usb/serial/ir-usb.c

@@ -405,7 +405,7 @@ static int ir_write (struct usb_serial_port *port, int from_user, const unsigned
 		= USB_QUEUE_BULK
 		| USB_ZERO_PACKET;
 
-	result = usb_submit_urb (port->write_urb, GFP_KERNEL);
+	result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 	if (result)
 		err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
 	else
@@ -515,7 +515,7 @@ static void ir_read_bulk_callback (struct urb *urb)
 
 			port->read_urb->transfer_flags = USB_QUEUE_BULK;
 
-			result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+			result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 
 			if (result)
 				err("%s - failed resubmitting read urb, error %d",

drivers/usb/serial/keyspan.c

@@ -378,7 +378,7 @@ static int keyspan_write(struct usb_serial_port *port, int from_user,
 
 		this_urb->transfer_flags &= ~USB_ASYNC_UNLINK;
 		this_urb->dev = port->serial->dev;
-		if ((err = usb_submit_urb(this_urb, GFP_KERNEL)) != 0) {
+		if ((err = usb_submit_urb(this_urb, GFP_ATOMIC)) != 0) {
 			dbg("usb_submit_urb(write bulk) failed (%d)\n", err);
 		}
 		p_priv->tx_start_time[flip] = jiffies;
@@ -436,7 +436,7 @@ static void	usa26_indat_callback(struct urb *urb)
 				
 		/* Resubmit urb so we continue receiving */
 	urb->dev = port->serial->dev;
-	if ((err = usb_submit_urb(urb, GFP_KERNEL)) != 0) {
+	if ((err = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
 		dbg(__FUNCTION__ "resubmit read urb failed. (%d)\n", err);
 	}
 	return;
@@ -535,7 +535,7 @@ static void	usa26_instat_callback(struct urb *urb)
 exit:
 	/* Resubmit urb so we continue receiving */
 	urb->dev = serial->dev;
-	if ((err = usb_submit_urb(urb, GFP_KERNEL)) != 0) {
+	if ((err = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
 		dbg(__FUNCTION__ "resubmit read urb failed. (%d)\n", err);
 	}
 }
@@ -586,7 +586,7 @@ static void     usa28_indat_callback(struct urb *urb)
 
 		/* Resubmit urb so we continue receiving */
 		urb->dev = port->serial->dev;
-		if ((err = usb_submit_urb(urb, GFP_KERNEL)) != 0) {
+		if ((err = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
 			dbg(__FUNCTION__ "resubmit read urb failed. (%d)\n",
 err);
 		}
@@ -671,7 +671,7 @@ static void	usa28_instat_callback(struct urb *urb)
 exit:	
 		/* Resubmit urb so we continue receiving */
 	urb->dev = serial->dev;
-	if ((err = usb_submit_urb(urb, GFP_KERNEL)) != 0) {
+	if ((err = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
 		dbg(__FUNCTION__ "resubmit read urb failed. (%d)\n", err);
 	}
 }
@@ -764,7 +764,7 @@ static void	usa49_instat_callback(struct urb *urb)
 		/* Resubmit urb so we continue receiving */
 	urb->dev = serial->dev;
 
-	if ((err = usb_submit_urb(urb, GFP_KERNEL)) != 0) {
+	if ((err = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
 		dbg(__FUNCTION__ "resubmit read urb failed. (%d)\n", err);
 	}
 }
@@ -819,7 +819,7 @@ static void	usa49_indat_callback(struct urb *urb)
 				
 		/* Resubmit urb so we continue receiving */
 	urb->dev = port->serial->dev;
-	if ((err = usb_submit_urb(urb, GFP_KERNEL)) != 0) {
+	if ((err = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
 		dbg(__FUNCTION__ "resubmit read urb failed. (%d)\n", err);
 	}
 }

drivers/usb/serial/keyspan_pda.c

@@ -292,7 +292,7 @@ static void keyspan_pda_rx_unthrottle (struct usb_serial_port *port)
 	/* just restart the receive interrupt URB */
 	dbg("keyspan_pda_rx_unthrottle port %d", port->number);
 	port->interrupt_in_urb->dev = port->serial->dev;
-	if (usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL))
+	if (usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC))
 		dbg(" usb_submit_urb(read urb) failed");
 	return;
 }
@@ -584,7 +584,7 @@ static int keyspan_pda_write(struct usb_serial_port *port, int from_user,
 		priv->tx_room -= count;
 
 		port->write_urb->dev = port->serial->dev;
-		rc = usb_submit_urb(port->write_urb, GFP_KERNEL);
+		rc = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 		if (rc) {
 			dbg(" usb_submit_urb(write bulk) failed");
 			goto exit;

drivers/usb/serial/kl5kusb105.c

@@ -519,7 +519,7 @@ static int klsi_105_write (struct usb_serial_port *port, int from_user,
 		}
 
 		if (urb->transfer_buffer == NULL) {
-			urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
+			urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
 			if (urb->transfer_buffer == NULL) {
 				err(__FUNCTION__ " - no more kernel memory...");
 				goto exit;
@@ -555,7 +555,7 @@ static int klsi_105_write (struct usb_serial_port *port, int from_user,
 
 
 		/* send the data out the bulk port */
-		result = usb_submit_urb(urb, GFP_KERNEL);
+		result = usb_submit_urb(urb, GFP_ATOMIC);
 		if (result) {
 			err(__FUNCTION__
 			    " - failed submitting write urb, error %d", result);
@@ -721,7 +721,7 @@ static void klsi_105_read_bulk_callback (struct urb *urb)
 		      port->read_urb->transfer_buffer_length,
 		      klsi_105_read_bulk_callback,
 		      port);
-	rc = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	rc = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 	if (rc)
 		err(__FUNCTION__ 
 		    " - failed resubmitting read urb, error %d", rc);
@@ -1019,7 +1019,7 @@ static void klsi_105_unthrottle (struct usb_serial_port *port)
 	dbg(__FUNCTION__ " - port %d", port->number);
 
 	port->read_urb->dev = port->serial->dev;
-	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 	if (result)
 		err(__FUNCTION__ " - failed submitting read urb, error %d",
 		    result);

drivers/usb/serial/mct_u232.c

@@ -470,7 +470,7 @@ static int mct_u232_write (struct usb_serial_port *port, int from_user,
 			      port);
 		
 		/* send the data out the bulk port */
-		result = usb_submit_urb(port->write_urb, GFP_KERNEL);
+		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 		if (result) {
 			err(__FUNCTION__
 			    " - failed submitting write urb, error %d", result);

drivers/usb/serial/omninet.c

@@ -265,7 +265,7 @@ static void omninet_read_bulk_callback (struct urb *urb)
 		      usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
 		      urb->transfer_buffer, urb->transfer_buffer_length,
 		      omninet_read_bulk_callback, port);
-	result = usb_submit_urb(urb, GFP_KERNEL);
+	result = usb_submit_urb(urb, GFP_ATOMIC);
 	if (result)
 		err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
 
@@ -316,7 +316,7 @@ static int omninet_write (struct usb_serial_port *port, int from_user, const uns
 	wport->write_urb->transfer_buffer_length = 64;
 
 	wport->write_urb->dev = serial->dev;
-	result = usb_submit_urb(wport->write_urb, GFP_KERNEL);
+	result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
 	if (result)
 		err(__FUNCTION__ " - failed submitting write urb, error %d", result);
 	else

drivers/usb/serial/pl2303.c

@@ -195,7 +195,7 @@ static int pl2303_write (struct usb_serial_port *port, int from_user,  const uns
 
 	port->write_urb->transfer_buffer_length = count;
 	port->write_urb->dev = port->serial->dev;
-	result = usb_submit_urb (port->write_urb, GFP_KERNEL);
+	result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 	if (result)
 		err(__FUNCTION__ " - failed submitting write urb, error %d", result);
 	else
@@ -643,7 +643,7 @@ static void pl2303_read_bulk_callback (struct urb *urb)
 			dbg (__FUNCTION__ " - caught -EPROTO, resubmitting the urb");
 			urb->status = 0;
 			urb->dev = serial->dev;
-			result = usb_submit_urb(urb, GFP_KERNEL);
+			result = usb_submit_urb(urb, GFP_ATOMIC);
 			if (result)
 				err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
 			return;
@@ -668,7 +668,7 @@ static void pl2303_read_bulk_callback (struct urb *urb)
 	/* Schedule the next read _if_ we are still open */
 	if (port->open_count) {
 		urb->dev = serial->dev;
-		result = usb_submit_urb(urb, GFP_KERNEL);
+		result = usb_submit_urb(urb, GFP_ATOMIC);
 		if (result)
 			err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
 	}
@@ -697,7 +697,7 @@ static void pl2303_write_bulk_callback (struct urb *urb)
 		dbg (__FUNCTION__ " - nonzero write bulk status received: %d", urb->status);
 		port->write_urb->transfer_buffer_length = 1;
 		port->write_urb->dev = port->serial->dev;
-		result = usb_submit_urb (port->write_urb, GFP_KERNEL);
+		result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 		if (result)
 			err(__FUNCTION__ " - failed resubmitting write urb, error %d", result);
 

drivers/usb/serial/usbserial.c

@@ -899,7 +899,7 @@ static int generic_write (struct usb_serial_port *port, int from_user, const uns
 				     generic_write_bulk_callback), port);
 
 		/* send the data out the bulk port */
-		result = usb_submit_urb(port->write_urb, GFP_KERNEL);
+		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 		if (result)
 			err(__FUNCTION__ " - failed submitting write urb, error %d", result);
 		else
@@ -989,7 +989,7 @@ static void generic_read_bulk_callback (struct urb *urb)
 			   ((serial->type->read_bulk_callback) ? 
 			     serial->type->read_bulk_callback : 
 			     generic_read_bulk_callback), port);
-	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 	if (result)
 		err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
 }

drivers/usb/serial/visor.c

@@ -344,13 +344,13 @@ static int visor_write (struct usb_serial_port *port, int from_user, const unsig
 
 	dbg(__FUNCTION__ " - port %d", port->number);
 
-	buffer = kmalloc (count, GFP_KERNEL);
+	buffer = kmalloc (count, GFP_ATOMIC);
 	if (!buffer) {
 		err ("out of memory");
 		return -ENOMEM;
 	}
 
-	urb = usb_alloc_urb(0, GFP_KERNEL);
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
 	if (!urb) {
 		err ("no more free urbs");
 		kfree (buffer);
@@ -377,7 +377,7 @@ static int visor_write (struct usb_serial_port *port, int from_user, const unsig
 	urb->transfer_flags |= USB_QUEUE_BULK;
 
 	/* send it down the pipe */
-	status = usb_submit_urb(urb, GFP_KERNEL);
+	status = usb_submit_urb(urb, GFP_ATOMIC);
 	if (status) {
 		err(__FUNCTION__ " - usb_submit_urb(write bulk) failed with status = %d", status);
 		count = status;
@@ -491,7 +491,7 @@ static void visor_read_bulk_callback (struct urb *urb)
 			   port->read_urb->transfer_buffer,
 			   port->read_urb->transfer_buffer_length,
 			   visor_read_bulk_callback, port);
-	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 	if (result)
 		err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
 	return;
@@ -512,7 +512,7 @@ static void visor_unthrottle (struct usb_serial_port *port)
 	dbg(__FUNCTION__ " - port %d", port->number);
 
 	port->read_urb->dev = port->serial->dev;
-	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 	if (result)
 		err(__FUNCTION__ " - failed submitting read urb, error %d", result);
 }

drivers/usb/serial/whiteheat.c

@@ -240,7 +240,7 @@ static void command_port_read_callback (struct urb *urb)
 		      usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
 		      port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
 		      command_port_read_callback, port);
-	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 	if (result)
 		dbg(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
 }